Model 12B
Single Channel Control Module
Operator’s Installation and Instruction Manual
Covers all Model 10C Control Modules
DETCON, Inc.
4055 Technology Forest Blvd. Suite 100,
The Woodlands, Texas 77381
Ph.281.367.4100 / Fax 281.298.2868
www.detcon.com
April 25, 2012 • Document #1953 • Revision 1.4
Model 12B
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12B Control Module Instruction Manual
ii
Model 12B
Table of Contents
1.0 Description .......................................................................................................................................... 1
2.0 Specification........................................................................................................................................ 2
3.0 Controller models ............................................................................................................................... 2
4.0 Alarm functions and settings.............................................................................................................. 3
4.1
Alarm set points .............................................................................................................................. 3
4.2
Latching or non-Latching Relays ..................................................................................................... 4
4.3
Relay Contact Output Select ............................................................................................................ 4
4.4
Energized or De-energized............................................................................................................... 5
4.5
Ascending or Descending Alarms .................................................................................................... 5
4.6
Alarm Reset..................................................................................................................................... 5
4.7
Alarm Disable ................................................................................................................................. 5
5.0 POWER INPUT OPTIONS ............................................................................................................... 6
6.0 ANALOG 4-20 MA SIGNAL INPUT/OUTPUT ............................................................................... 6
7.0 RS-485 MODBUS™ FEATURES AND SPECIFICATIONS ........................................................... 6
8.0 FAULT CIRCUIT FUNCTIONS ....................................................................................................... 7
8.1
Detector Load Bypass Jumper.......................................................................................................... 7
9.0 TEST FUNCTIONS............................................................................................................................ 8
9.1
Alarm Set Point Test........................................................................................................................ 8
9.2
Display/Alarm Test ......................................................................................................................... 9
9.3
RS-485 Address Setting Test ........................................................................................................... 9
10.0 OTHER FEATURES.......................................................................................................................... 9
10.1 Flashing Over-range ........................................................................................................................ 9
10.2 Range Configuration Jumpers........................................................................................................ 10
10.3 PolySwitch Over-current Protection............................................................................................... 10
10.4 Default Settings of Jumpers Tabs................................................................................................... 11
11.0 WARRANTY AND SERVICE POLICY ......................................................................................... 11
Revision History ....................................................................................................................................... 12
Table of Figures
Figure 1 Alarm Set switches and Alarm Relay Jumpers
............................................................................................................................................................ Er
ror! Bookmark not defined.
List of Tables
Table 1 Switch positions for setting alarm points..........................................................................................3
Table 2 Range configuration jumper locations and settings...........................................................................10
12B Control Module Instruction Manual
iii
Model 12B
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Shipping Address 4055 Technology Forest Blvd. Suite 100,., The Woodlands Texas 77381
Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067
Phone: 888.367.4286, 281.367.4100 • Fax: 281.292.2860 • www.detcon.com • sales@detcon.com
12B Control Module Instruction Manual
iv
Model 12B
1.0
Description
Detcon Model 12B single channel digital control modules are designed to supervise and display the status of a
single remote sensor assembly. Modules are available for a variety of toxic and combustible gases. Model 12B
series control modules are designed to operate on an input voltage of 24 VDC and are compatible with a
complete line of Detcon enclosures and mainframe hardware assemblies. The available enclosures include
designs for rack or panel mounting in non-hazardous areas (NEMA 1), for weather proof outdoor location in
non-hazardous areas (NEMA 4), and for location in areas electrically classified hazardous or explosion proof
(NEMA 7).
Any combination of Model 12B control modules and Detcon sensor assemblies may be installed in a common
mainframe assembly thereby providing monitoring for a variety of gases. Model 12B control modules are
compatible with a linear 4-20 mA DC input signal. The module features a direct reading 3 digit display of the
gas concentration, flashing over-range, alarm disable, RS-485 Modbus™ serial output, 4-20 mA analog signal
output, and four alarm relays that are status displayed via light emitting diodes located on the front panel.
Alarm functions are alarm 1, alarm 2, alarm 3, and fault. All alarms are jumper programmable for latching or
non-latching operation with a common front panel reset switch. The reset is part of a common bus when
installed in a mainframe, allowing for the use of an external reset switch common to all modules in the
mainframe.
12B Control Module Instruction Manual
Rev 1.4
Page 1 of 12
Model 12B
2.0
Specification
Range
0-99 ppm/% is typical but varies according to application
Accuracy/Repeatability
± 2% F.S.
Operating Temperature
–40° F to +175° F
Input Power
24 VDC standard; 12 VDC optional
Power Consumption
<3 watts (no alarms)
5 watts (full alarm peak load)
Warranty
One year
Five year fixed fee service policy
Outputs
Analog 4-20 mA DC
Serial RS-485 Modbus™
Relays
Contacts include common with jumper selectable choice of normally open or normally closed for four
alarms
Resistive load: 5A, 250 VAC; 5A, 30 VDC
Inductive load: 2A, 250 VAC; 2A, 30 VDC
Max operating current: 5A
3.0
Controller models
Model 12B control modules are compatible with any 4-20 mA signal input and therefore are interchangeable.
This design flexibility allows a single module to be user programmed to be compatible with any of the gases or
ranges listed below via rotary dip switches or jumper tabs. A change of face plate which reflects the proper
labeled gas is the only other change that is required. The Model 12B control module model numbers listed
below are shipped preconfigured for the gases and ranges as listed.
Model
CH-12B
O2-12B
NH-12B
HC-12B
PH-12B
HL-12B
HS-12B
Gas
combustible gas
O2 oxygen deficiency
NH3 ammonia
HCN hydrogen cyanide
PH3 Phosphine
HCL hydrogen chloride
H2S hydrogen sulfide
12B Control Module Instruction Manual
Rev 1.4
Standard Range
Optional Ranges
0 - 100 % LEL
0 - 25.0 %
0 - 100 ppm
0 - 10.0 ppm
0 - 100 ppm
0 - 10.0 ppm
0 - 100 ppm
0 - 1.0
0 - 10
0 - 25
0 - 50
0 - 10.0
0 - 50.0
0 - 99.9
Page 2 of 12
Model 12B
CO-12B
SO-12B
NO-12B
CL-12B
CD-12B
H2-12B
NX-12B
4.0
CO carbon monoxide
SO2 sulfur dioxide
NO2 nitrogen dioxide
CL2 chlorine
CLO2 chlorine dioxide
H2 hydrogen
NO nitric oxide
0 - 100 ppm
0 - 100 ppm
0 - 100 ppm
0 - 10.0 ppm
0 - 10.0 ppm
0 - 100 ppm
0 - 100 ppm
0 - 100
0 - 200
0 – 500
0 – 999
Alarm functions and settings
Model 12B control modules incorporate several user selectable alarm programming options that are
accomplished via rotary dip switches or jumper tabs. These options include setting alarm points, latching of
relays, contact outputs, energized/de-energized, and firing direction. See figure X for the applicable rotary
switch and jumper tab locations.
4.1
Alarm set points
Three alarms — alarm 1, alarm 2, and alarm 3 — can be set to fire in 1 digit increments via rotary dip
switches. Each alarm features three rotary switches in which the desired alarm level is dialed by use of a
jeweler’s screwdriver: one for 1’s, one for 10’s, and one for 100’s. The switch for 1’s is used to select the set
point of the least significant digit - 0 through 9. The switch for 10’s is used to select the set point of the middle
digit — 00 through 90. The switch for 100’s is used to select the set point of the most significant digit — 000
through 900.
An alarm condition will cause the alarm relay to actuate upon reaching and/or exceeding the alarm set point.
To set an alarm, follow this example: if you want the alarm to actuate at 25 ppm/% you would set the 100’s
switch to 0, the 10’s switch to 2 and the 1’s switch to 5. The chart below shows which switches correspond to
each alarm.
Digits
1’s
10’s
100’s
Alarm 1
SW2
SW3
SW4
Alarm 2
SW5
SW6
SW7
Alarm 3
SW8
SW9
SW10
Table 1 Switch positions for setting alarm points
12B Control Module Instruction Manual
Rev. 1.4
Page 3 of 12
Model 12B
Figure 1 Alarm Set switches and Alarm Relay Jumpers
4.2
Latching or non-Latching Relays
All alarms — alarm 1, 2, 3, and fault — can be jumper programmed to operate as latching or nonlatching. If an alarm is programmed to latch, its corresponding relay and LED indicator, once
activated, will stay activated until the reset button is pressed (assuming, of course, that alarm
conditions have cleared).
To program an alarm for latching operation: Place a jumper tab on pins 1 and 2 (left and center) of
its corresponding jumper location. For non-latching operation place the tab on pins 2 and 3 (center
and right) of the jumper location. The jumper locations are as follows: fault - JP12, alarm 1 - JP9,
alarm 2 - JP5, and alarm 3 - JP1.
4.3
Relay Contact Output Select
All alarm relays — alarm 1, 2, 3, and fault — can be jumper programmed for dry contact output as either
normally open or normally closed. Refer to section 2.1 for contact ratings. To program an alarm relay for
normally open contact output, place a jumper tab on pins 1 and 2 (bottom and center) of its corresponding
jumper location. For normally closed contact output, place the tab on pins 2 and 3 (center and top) of the
jumper location. The jumper locations are as follows: fault - JP20, alarm 1 - JP18, alarm 2 - JP16, and alarm 3
- JP14.
12B Control Module Instruction Manual
Rev 1.4
Page 4 of 12
Model 12B
4.4
Energized or De-energized
All alarm relays — alarm 1, 2, 3, and fault — can be jumper programmed as normally energized or normally
de-energized. The standard is de-energized. However, a relay can be programmed as energized to provide
application specific features. A normally energized relay will de-energize when in alarm. A typical application
of the energized configuration is to have the fault relay normally energized so that in the event of a power
failure to the control module card, the fault relay will de-energize causing its relay contacts to change state,
thereby creating a fault output.
It must be noted that when an alarm relay is jumper programmed as normally energized, the contact outputs,
normally open and normally closed, become reversed (see section 2.3.3). The normally open contact becomes
the normally closed and vice versa. Reconfiguration of the contact output jumpers may be required. To
program an alarm relay as normally de-energized, place a jumper tab on pins 1 and 2 (left and center) of its
corresponding jumper location. For normally energized operation, place the tab on pins 2 and 3 (center and
right) of the jumper location. The jumper locations are as follows: fault - JP19, alarm 1 - JP17, alarm 2 - JP15,
and alarm 3 - JP13.
4.5
Ascending or Descending Alarms
Three alarms — alarm 1, 2, and 3 — can be jumper programmed to operate during ascending or descending
gas conditions. This feature is useful mainly for the monitoring of oxygen deficiency whereas a decrease in
oxygen concentration poses a danger to personnel. However, there may be other applications where the
monitoring of a specific gas concentration is desired and alarms can be programmed to operate when that
concentration exceeds or drops below a predetermined range. Typically, most applications of monitoring for
toxic or combustible gases will warrant that the alarm be programmed as ascending.
To program an alarm for ascending gas conditions: place a jumper tab on pins 1 and 2 (left and center) of its
corresponding jumper location. For descending gas conditions, place the tab on pins 2 and 3 (center and right)
of the jumper location. The jumper locations are as follows: alarm 1 - JP10, alarm 2 - JP6, and alarm 3 - JP2.
4.6
Alarm Reset
An alarm reset switch (SW1), located on the control module face plate is used to reset alarms that have been
programmed as latching. Once alarm conditions have cleared, alarms may be reset by simply pushing the
momentary switch and releasing it.
Remote reset outputs are also a feature of the 12B control module. This feature is available when used in
conjunction with Model 12B compatible control enclosures and mainframe motherboards.
4.7
Alarm Disable
An alarm disable switch (S1), located on the control module face plate is used to disable alarm 1, 2, and 3
alarm relays. The corresponding LEDs are not affected. This feature is useful for calibration or
troubleshooting. The alarm disable switch toggle is located slightly behind the face plate in order to help avoid
accidental use. When the switch is in the disable position, it will cause a fault condition that will activate the
fault relay and LED, and output a fault code on the RS-485 serial loop.
To disable alarms, simply toggle the switch to the down position. To re-enable the alarms, toggle the switch
back to the up position.
12B Control Module Instruction Manual
Rev. 1.4
Page 5 of 12
Model 12B
5.0
POWER INPUT OPTIONS
Standard operating input power of the Model 12B control module is 24 VDC unless 12 VDC is specified at
time of order. All of the circuitry of the 12B control module, with the exception of relays, will operate on 12 or
24 VDC.
A 24 VDC control module can be converted to a 12 VDC control module by changing the relays. If this is
desired, it is recommended that the control modules be returned to Detcon to be converted.
6.0
ANALOG 4-20 MA SIGNAL INPUT/OUTPUT
Model 12B control modules receive an analog 4-20 mA signal input corresponding to the range of detection.
The signal is processed through an analog to digital converter and is calibrated so that a 4 mA input will
provide display readout of “0”. This circuitry is factory set. Should adjustment become necessary, the analog
to digital converter can be fine-tuned via the input zero potentiometer (PT1).
Model 12B control modules feature a discreet 4-20 mA signal output corresponding to the range of
detection. This feature is factory set. Should adjustment become necessary, the digital to analog converter can
be calibrated via the output zero potentiometer (PT3), and the output span potentiometer (PT2).
7.0
RS-485 MODBUS™ FEATURES AND
SPECIFICATIONS
Model 12B control modules feature Modbus™ compatible communications protocol and are addressable via
rotary dip switches for multi-point communications. Communication is two-wire, half duplex, with the 12B
control module set up as a slave device. The communications is Modbus RS-485 with 19200 Baud, 8 data bits,
no parity, and 1 stop bit. A master controller up to 4000 feet away can theoretically poll up to 256 different
12B control module cards. This number may not be realistic in harsh environments where noise and/or wiring
conditions would make it impractical to place so many devices on the same pair of wires. If a multipoint
system is being utilized, each 12B control module should be set for a different address. Typical address
settings are: 01, 02, 03, 04, 05, 06, 07, 08, 09, 0A, 0B, 0C, 0D, 0E, 0F, 10, 11, etc.
Model 12B control module ID numbers are set via SW11 and SW12. For example, to set the ID number to 01,
set the most-significant-bit rotary dip switch (SW11) to 0, and the least-significant-bit rotary dip switch
(SW12) to 1. The following register list describes the parameters available from the 12B control module:
40000
40001
40002
40003
40004
Range
Reading
Alarm 1 Set Point
Alarm 2 Set Point
Alarm 3 Set Point
12B Control Module Instruction Manual
Rev 1.4
Page 6 of 12
Model 12B
8.0
FAULT CIRCUIT FUNCTIONS
Model 12B control modules feature fail safe supervisory circuits designed to assure maximum reliability in
system performance. A fault condition will cause the fault LED to illuminate and the fault relay to actuate. The
exception to this is if the fault relay is jumper-programmed as normally energized, a loss of external 24 VDC
power or the internal 5 VDC supply will cause the relay to de-energize but the LED will not illuminate.
Below is a list of conditions that will cause a fault alarm.
1) Placing the alarm disable switch in the disable position
2) Loss of 24 VDC power to the 12B control module (only if relay is jumper programmed as normally
energized).
3) Open power loop from the control module to the sensor.
4) Open signal loop from the control module to the sensor.
5) When used with a Detcon TP series solid state H2S sensor — an open heater on the sensor chip
6) When used with a Detcon FP series combustible sensor — an open catalytic bead or bridge.
7) Loss of the internal 5 VDC supply (only if relay is jumper programmed as normally energized).
8) Signal level drift below 2.4 mA from the sensor.
8.1
Detector Load Bypass Jumper
When a sensor other than the Detcon TP series H2S, or FP series LEL is used with the 12B control module, a
load bypass jumper must be placed in the appropriate location to prevent a false fault alarm. This jumper’s
purpose is to bypass the heater/bridge fault detection circuitry which is not needed when used with Detcon
oxygen or toxic gas sensors.
Another application that will require the load bypass jumper is if the sensor is being powered by a power
supply other than the supply that is coming from the 12B control module. In this instance, the load bypass
jumper will prevent a false fault condition that would be caused by the 12B control module’s monitoring of the
power loop. An example of this type of application is a sensor that is part of a sample draw system. In this
instance, the sensor is an integral part of the sample draw system and is typically powered by that system. If
desired, gas conditions at the sensor can be monitored by simply terminating the 4-20 mA signal output from
the sensor to the 12B control module. Since the control module is not powering the sensor, it will detect a
power loop fault and will require that the load bypass feature be used.
12B Control Module Instruction Manual
Rev. 1.4
Page 7 of 12
Model 12B
To program the load bypass circuit for either of the conditions described above: place a jumper tab on pins 2
and 3 (center and right) of the jumper location labeled JP-21. When the 12B control module is used in
conjunction with a Detcon TP or FP series sensor, and is being powered by the 12B control module, the
jumper tab should be placed on pins 1 and 2 (left and center) of the jumper location.
9.0
TEST FUNCTIONS
Model 12B control modules feature microprocessor supervised test functions that allow the user to verify
various control module settings and performance without having to remove the control module card from the
control enclosure. The test functions are activated by the alarm reset switch located on the control module face
plate and all applicable data is then displayed via the seven-segment LED displays and alarm LEDs.
There are three test features:
1) Display of alarm set points for alarm 1, alarm 2, and alarm 3
2) A simulation of applying a full scale gas sample that will take the display through an incremental
count up to the top of the range and back down, activating alarms at the programmed set points and
allowing verification of alarm outputs, as well as the over-range flashing feature.
3) Display of the RS-485 Modbus™ address setting.
Entering the test mode is performed by pressing and holding the alarm reset button for about 5 seconds. This
will cause the fault LED to illuminate, indicating that you have entered the test mode. After the fault LED
illuminates, you will have 5 seconds to select a test function. This is done by pressing and releasing the alarm
reset button. Pressing once will select test one. Pressing twice will select test two. Pressing three times will
select test three. If the button is not pressed within the 5 second time limit, the 12B control module will
automatically return to the normal operating mode.
NOTE: The fault LED will remain illuminated during testing. However, the fault relay will
not activate during testing unless there is a fault condition. An example of this would be the
disabling of alarms during testing via the alarm disable switch.
Below is a description of how to perform each test and what will occur during the test.
9.1
Alarm Set Point Test
To perform the alarm set point test, press and hold the alarm reset button for about five seconds until the fault
LED illuminates. Next, press and release the alarm reset button once. The alarm 1 LED will illuminate
indicating that this test has been selected. The test will begin automatically within five seconds.
The test will begin by displaying the alarm 1 set point with the alarm 1 LED illuminated. After about 3
seconds, the alarm 2 set point will be displayed and the alarm 2 LED will illuminate. After an additional 3
seconds, the alarm 3 set point will be displayed and the alarm 3 LED will illuminate. As the display cycles
through the three alarm set points, only the corresponding alarm LED will be illuminated, indicating which
alarm is being displayed. Alarm relays are not activated during this test. Normal operation resumes when the
cycle is complete.
12B Control Module Instruction Manual
Rev 1.4
Page 8 of 12
Model 12B
9.2
Display/Alarm Test
To perform the display/alarm test, press and hold the alarm reset button for about five seconds until the fault
LED illuminates. Next, press and release the alarm reset button twice. The alarm 2 LED will illuminate
indicating that this test has been selected. The test will begin automatically within five seconds. Normal
operation resumes when the test is complete.
The test will begin by displaying an incremental count up from the bottom of the range (0) to the top of the
range with the count changing approximately three times each second. The exception to this is oxygen
monitoring which will begin its count at the top of the range and go down. As the count reaches an alarm set
point, that alarm will activate both LED and relay. When the count reaches the top of the range it will hold
there briefly to allow verification of the flashing over-range feature before it begins the count back down to
zero. As the test counts down below an alarm set point, that alarm will de-activate. If the alarm is programmed
for latching operation it will remain active. After the test is complete and the control module returns to normal
operation, the alarm reset button can be pressed to de-activate latching alarms. If the actuating of alarm relays
during this test is problematic, alarm relays can be disabled by toggling the alarm disable switch into the
disable (down) position.
9.3
RS-485 Address Setting Test
To perform the RS-485 address setting test, press and hold the alarm reset button for about five seconds until
the fault LED illuminates. Next, press and release the alarm reset button three times. The alarm 3 LED will
illuminate indicating that this test has been selected. The test will begin automatically within five seconds and
will terminate automatically when completed.
The test will simply display the RS-485 address setting for approximately four seconds and then return the
control module to normal operating mode.
10.0 OTHER FEATURES
Model 12B control modules include other features which are discussed below.
10.1
Flashing Over-range
The flashing over-range feature will cause the display to flash on and off, at approximately one second
intervals once the top of the range has been exceeded. After the signal drops back into the normal range, the
display will cease flashing and operate normally.
12B Control Module Instruction Manual
Rev. 1.4
Page 9 of 12
Model 12B
10.2
Range Configuration Jumpers
The applicable range of the 12B control module is factory set according to its corresponding sensor.
However, the control module range of detection can be changed if a particular application should warrant it.
Range selection is accomplished via configuration jumpers. Use the table below to determine the proper con
figuration. See Figure 1 for applicable jumper locations.
Range
0 - 1.0
0 – 10
0 - 25 (O2)
0 – 25
0 – 50
0 - 10.0
0 - 25.0 (O2)
0 - 25.0
0 - 50.0
0 – 100
0 – 200
0 – 500
0 – 999
0 - 99.9
CFG1 (JP11)
2 to 3
2 to 3
1 to 2
2 to 3
1 to 2
1 to 2
2 to 3
1 to 2
2 to 3
1 to 2
2 to 3
1 to 2
2 to 3
1 to 2
CFG2 (JP7)
2 to 3
1 to 2
1 to 2
2 to 3
2 to 3
1 to 2
2 to 3
2 to 3
1 to 2
1 to 2
2 to 3
2 to 3
1 to 2
1 to 2
CFG3 (JP8)
2 to 3
2 to 3
2 to 3
1 to 2
1 to 2
1 to 2
2 to 3
2 to 3
2 to 3
2 to 3
1 to 2
1 to 2
1 to 2
1 to 2
CFG4 (JP3)
2 to 3
2 to 3
2 to 3
2 to 3
2 to 3
2 to 3
1 to 2
1 to 2
1 to 2
1 to 2
1 to 2
1 to 2
1 to 2
1 to 2
CFG5 (JP4)
2 to 3
2 to 3
2 to 3
2 to 3
2 to 3
2 to 3
2 to 3
2 to 3
2 to 3
2 to 3
2 to 3
2 to 3
2 to 3
2 to 3
Table 2 Range configuration jumper locations and settings
10.3
PolySwitch Over-current Protection
Model 12B control modules incorporate PolySwitch over-current protection components that act as resettable
fuses. The PolySwitch circuit protector is a positive temperature coefficient resistor that undergoes a large,
abrupt change in resistance when an over-current or high temperature heats it above a specific point. Normally
just tens of milliohms, the resistance of the PolySwitch protector increases orders of magnitude when
switched. This increase limits current to several milliamps.
When the current or temperature fault that caused the device to switch has been substantially reduced, the
PolySwitch device resets, allowing normal circuit operation to resume. The protector requires no manual
resetting or replacement. Four separate PolySwitches monitor and protect the following circuitry: the 4-20 mA
signal input loop, the 4-20 mA output signal loop, the 24 VDC input power loop, and the 24 VDC output
power loop to the sensor.
12B Control Module Instruction Manual
Rev 1.4
Page 10 of 12
Model 12B
10.4
Jumper
JP1
JP2
JP3
JP4
JP5
JP6
JP7
JP8
JP9
JP10
JP11
JP12
JP13
JP14
JP15
JP16
JP17
JP18
JP19
JP20
JP21
Default Settings of Jumpers Tabs
Default
1 to 2
none
none
none
1 to 2
none
none
none
1 to 2
none
none
1 to 2
1 to 2
1 to 2
1 to 2
1 to 2
1 to 2
1 to 2
2 to 3
2 to 3
none
Function
Alarm 3 (latched)
Alarm 3 Firing Direction
Configuration 4
Configuration 5
Alarm 2 (latched)
Alarm 2 Firing Direction
Configuration 2
Configuration 3
Alarm 1 (latched)
Alarm 1 Firing Direction
Configuration 1
Fault Alarm (latched)
Alarm 3 (de-energized)
Alarm 3 (normally open contacts)
Alarm 2 (de-energized)
Alarm 2 (normally open contacts)
Alarm 1 (de-energized)
Alarm 1 (normally open contacts)
Fault Alarm (energized)
Fault Alarm (normally open contacts when energized)
Detector Load Bypass
11.0 WARRANTY AND SERVICE POLICY
Detcon, Inc., as manufacturer, warrants each new Model 12B series digital electronic control module to be free
from defects in material and workmanship under intended normal use for a period of one year from date of
shipment to the original purchaser. Detcon, Inc, additionally provides for a fixed fee repair/replace service
policy which covers Model 12B series digital control modules for a period of five years after expiration of the
warranty. The fixed policy rate is $75.00 per control module, per transaction, during the period of the policy.
The policy is FOB Detcon, Inc., The Woodlands, Texas.
12B Control Module Instruction Manual
Rev. 1.4
Page 11 of 12
Model 12B
Appendix C
Revision History
Revision
1.3
1.4
Date
10/18/10
04/25/12
Changes made
Prior release
Converted to MS Word format from Quark Removed notation of customer
replaceable relays. Corrected Modbus specifications.
12B Control Module Instruction Manual
Rev 1.4
Page 12 of 12