Digital Level Sensor
Model 3005 Analog Board
User’s Guide
Version – 2011.06
Model 3005 Analog Board
User’s Guide
Siemens Energy, Inc.
Oil & Gas Solutions
10730 Telge Road
Houston, Texas 77095
USA
Document No. SEI-OG-DLS-005
Page 1 of 6
© Siemens AG 2011
Digital Level Sensor
Model 3005 Analog Board
User’s Guide
Version – 2011.06
Table of Contents
1
DESCRIPTION:.................................................................................................................................................. 3
2
CONFIGURATION ............................................................................................................................................ 3
3
OPERATION....................................................................................................................................................... 3
4
SETUP.................................................................................................................................................................. 4
5
MODEL 3005 ANALOG BOARD SPECIFICATIONS .................................................................................. 6
6
CONTACT INFORMATION ............................................................................................................................ 6
Document No. SEI-OG-DLS-005
Page 2 of 6
© Siemens AG 2011
Digital Level Sensor
Model 3005 Analog Board
User’s Guide
Version – 2011.06
1
DESCRIPTION:
The Model 3005 is designed to provide a single analog output from Siemens Digital Level Sensors. It
provides a 4-20mA signal output for the total fluid level of the tank. As an alternative to the Model 1000
terminal unit, it is intended for use when an analog signal for the tank level is required, and where only
one or two tanks are on location. The Model 3005 replaces the fuse board in the explosion-proof housing
on top of the Siemens Digital Level Sensor, and provides the same electrical protection. The Model 3005
requires 24 VDC and controls power to the level sensor. It powers the sensor on a pre-programmed
schedule, polls for the level analog value, powers the sensor down and outputs the analog signal. The
configurations for the Model 3005 are stored in the digital level sensor EEPROM, allowing for easy board
replacement if required.
2
CONFIGURATION
The single channel, 4-20mA board is designed to interface with Siemens Digital Level Sensors reporting
software versions 2.08 and higher. The sensor must be configured to communicate at 9600 baud, no
parity, 1 stop bit and a 2 wire RS485 communication line.
Three configuration commands are contained within the Siemens Digital Level Sensor firmware to support
the 4-20mA interface board.
1) Polling Period in seconds (30 seconds default).
2) 4mA output level in inches (0.0 inches default).
3) 20mA output level in inches (240.0 inches default).
The 4-20mA interface board has a pair of jumper pins to configure the output current in case of error.
When the pins are shorted the error output current is 4ma. If the pins are open the error output current is
20mA.
3
OPERATION
When powered up, the LED on the 4-20 mA interface board will blink until communication with the sensor
has been established and a correct software version has been verified. After software verification the
sensor is queried for the polling period. Finally, the output current level is requested, output on the 420mA current loop, and the level sensor is powered down. This process takes approximately 2 seconds.
The 4-20mA output current will be stable until the next poll. The time between the first poll and the
second poll is 15 seconds. Thereafter the polling period will be the value configured in the level sensor.
If the 4-20mA interface board detects an error condition, the sensor power is cycled, and two more
attempts are made to read a valid level. If the error condition persists, the sensor is powered down until
the next scheduled poll time. The 4-20mA current loop is set to 4mA or 20mA defined by the jumper
placement. The entire polling cycle will be retried at the next poll time.
Document No. SEI-OG-DLS-005
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© Siemens AG 2011
Digital Level Sensor
Model 3005 Analog Board
User’s Guide
Version – 2011.06
4
SETUP
The following equipment and components are required:

Siemens Digital Level Sensor with v2.08 or later software

Personal computer (PC) with terminal emulation software

Fuse board for the Siemens Digital Level Sensor

RS485-232 converter

Model 3005 Analog Output board

V1.1 of Analog Output board for use with all versions of sensor software above v2.08.

12 VDC power supply (to configure sensor)

24VDC power supply ( for 4-20mA operation)

250 ohm resistor to test the 4-20mA output when not connected to a PC or SCADA
system
Follow these steps to ensure a successful setup. Refer to the connection diagram in Figure 4.1.
1. Setup the computer to communicate with the sensor communicating at 9600,E,7,1.
2. Connect the 12 VDC power supply and RS485 communications to the sensor, with the
fuse board in place.
3. Verify the sensor has the proper software revision, v2.08 or later, by issuing the command
U**MV. If the software version is not correct the 4-20mA board will not communicate.
4. Gauge the tank and input the level offset into the level sensor. Verify the electronic level
matches the gauged level. If zero and span need to be scaled different than the default
values of 0.0” = 4mA and 240.0” = 20mA, input the new parameters now. The commands
are: U**MIN followed by the new level in inches and U**MAX followed by the new level in
inches. Following the input of new values the sensor will respond with “OK” if successful.
Also, check the 4-20mA configuration with the following command: U**MC?.
5. Once all parameters are input correctly, change the sensor baud rate and parity by
issuing the command U**B9600N81. The sensor will respond with U**BOK.
6. Power the sensor down, change the configuration of the computer to 9600,N,8,1 and
request a level U**?
7. If the sensor responds you’re ready to continue, if not return to area of failure and try
again.
8. Disconnect the RS485 communications from the sensor.
Document No. SEI-OG-DLS-005
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© Siemens AG 2011
Digital Level Sensor
Model 3005 Analog Board
User’s Guide
Version – 2011.06
9. Remove the fuse board.
10. Install the 4-20mA board in the place of the fuse board inside the sensor top housing.
11. Run 24 VDC to the 4-20mA board 24 V and ground terminals. The board sources loop
current on A+ and A- terminals.
12. Upon power up with 24 VDC the analog output board will flash it’s LED while it retrieves
the sensor’s 4-20mA configuration, then it will stop flashing and will poll the sensor at the
programmed interval, 30 seconds default.
Figure 5.1 Model 3005 Analog Board Connection Diagram
Document No. SEI-OG-DLS-005
Page 5 of 6
© Siemens AG 2011
Digital Level Sensor
Model 3005 Analog Board
User’s Guide
Version – 2011.06
5
MODEL 3005 ANALOG BOARD SPECIFICATIONS
Electrical specifications
 Operating temperature range: -40° C to +85° C
 Power requirements: 24 VDC +/- 10%
 Requires 125mA max
 Requires two wires for power and two wires for 4-20mA loop
4-20mA conversion accuracy*
 Resolution: 16 bit
 Monotonicity: 16 bit min
 Integral non-linearity: +/- 0.012% max
 Offset: +/- 0.05% max

6
Total output error: +/- 0.15% max
CONTACT INFORMATION
For further information or for assistance, please contact:
Siemens Energy, Inc.
Oil & Gas Solutions
10730 Telge Road
Houston, TX 77095
Phone: +1 (888) 856-4528 or +1 (281) 856-4530
Email: oilandgaslcm.energy@siemens.com
Web: www.siemens.com/energy/dls
Document No. SEI-OG-DLS-005
Page 6 of 6
© Siemens AG 2011