B
ARNSTEAD
|T
HERMOLYNE
C
ORPORATION
Model #
0021-0000
Input Ranges
1mV, 2mV, 5 mV, 10 mV, 20 mV,
50 mV, 100 mV, 200 mV, 500 mV,
1V, 2V, and 5V
0115-0176 • 12/2/96 Serial Number
1

2
Introduction ........................................................................................................................................................ 3
Warranty Card ................................................................................................................................................. 3
Initial Inspection .............................................................................................................................................. 3
Description ...................................................................................................................................................... 3
Specifications ..................................................................................................................................................... 4
Theory Of Operation .......................................................................................................................................... 5
Installation .......................................................................................................................................................... 6
Input Signal Connections ................................................................................................................................ 6
Recording Procedure ......................................................................................................................................... 8
Special Features ............................................................................................................................................. 8
Retransmitting Output .................................................................................................................................. 8
Replacement Parts ............................................................................................................................................. 9
Accessories ..................................................................................................................................................... 9
Module to Mainframe Wiring ............................................................................................................................ 10
Ordering Procedures ........................................................................................................................................ 11
One Year Limited Warranty .............................................................................................................................. 12

Please fill in and return the Warranty Registration card so we may validate the beginning date of the warranty period.
The module should be inspected for shipping damage immediately after unpacking. If any damage is found, please notify the carrier and the
Barnstead|Thermolyne Customer Service
Department.
If the module fails to operate properly, check all connections and switch settings and insure that the plug-in connector is firmly seated in place.
Also check the “Set-Up Procedure” contained in the Series 2000 Mainframe Manual or Series
1000 Manual before calling
Barnstead|Thermolyne.
Do not return module for warranty service without specific authorization from the factory customer service department.
The Model 21 Millivolt/Volt Module is a multiple range voltage signal conditioning device designed for use with Series 2000 and 1000
Mainframes.
This module provides the necessary scaling for unknown DC input signals from 1 millivolt to 5 volts full scale; 2.5:1 variable attenuation; pen zero adjust of
±
100% of full scale; Record/
Standby operation and connections for signal inputs.
3

4
1.
Input Ranges : 12: 1mV, 2mV, 5mV,
10mV, 20mV, 50mV, 100mV, 200mV,
500mV, 1V, 2V and 5V
2.
Accuracy:
±
0.1% of Full Scale
3.
Offset:Less than 0.5% Range to Range
4.
Zero: Adjustable
±
100%
5.
Attenuation: 2.5:1
6.
Input: 5-Way Binding Posts
7.
Input Type: Single ended floating to
±
50VDC or 30VAC RMS
8.
Input Impedance: 2.5 Megohms Fixed
9.
Retransmitting Output
0-100mV
Factory set to
Customer adjustable to 0-5V
10. Shielding: Ground Plane and Module
Housing
11. Filtering: 50/60Hz RC, 16 db Minimum
Normal Mode
12. Storage Temp: -20
°
F to +120
°
F
13. Operating Temp: +32
°
F to 100
°
F
14. Operating Humidity: 5% to 90%
Non-condensing
15. Weight: 6 0z (0.17Kg )
16. Front Panel Controls:
Record/Standby ... 2 Position Push-Button mV/Volt ................ 2 Position Push-Button
Zero ..................... Rotary Potentiometer
Attenuator/Cal ..... Rotary Switch/
Potentiometer
Range .................. Rotary 12 Position
Switch

Figure 1 Block Diagram
The input signal is applied through the Record/
Standby (REC/STBY) switch, in the REC position, to the mV/Volt switch. In mV, the signal is fed directly to the filter and to scaling amplifier
U1. In the Volt position, the signal is divided by
100 before being applied to the filter and U1. The gain of U1 is selected by the Range switch. The output of U1 is 100mV for full scale pen deflection. The output of U1 is routed through unity gain amplifier U2 through the CAL/ATTEN switch/control. In CAL, the signal is fed directly to
U2. In ATTEN, the signal may be reduced by up to 2.5:1 by adjustment of the variable attenuator control. The output of buffer U2 is offset by setting the ZERO control to position the pen
‘ZERO’ on the chart as desired. The output of U2 is routed to the Servo Amplifier, the AUX SIG
OUT, Output Buffer U3A and to the optional Set
Point Alarms when installed. The output of Buffer
Amplifier U3A is factory set to “0 to 100mV” but may be adjusted to any output up to +5 volts.
(See Figure 1). The output of U3A is connected to the + terminal on the rear of the recorder.
5

CAUTION
Sensitive electronic devices.
Do not ship or store near strong electrostatic, electromagnetic, magnetic or radioactive fields
1.
Be sure power is “OFF’ and power pack is connected
2.
Remove blank panel(s) (P/N 9050-0155) if installed (one per module ).
3.
Remove retainer thumb screw(s) from storage hole(s) located next to input terminals on the back of the module.
4.
Insert module PCB into guide rails, solder side UP, and press to rear as far as possible being sure guide pins engage holes in front of cover (see
Figure 2). Insert retainer thumb screw(s) into hole in mainframe next to input terminals and secure module in place.
Figure 2 mV/Volt Module—Installation
6
1.
Positive Going Input Signals:
A.
For RIGHT Hand Zero (Standard) adjust pen(s) to right side of the chart with the ZERO control(s). Pen will drive to the left.
1. Connect signal positive (+) to
RED post
2. Connect signal negative (-) to
BLACK post
B.
For LEFT Hand Zero adjust pen (s) to left side of the chart with ZERO control(s). Pen(s) will drive to the right.

I
NSTALLATION
1. Connect signal positive (+) to
BLACK post
2. Connect signal negative (-) to
RED post
2.
Negative Going Input Signals:
A.
For RIGHT Hand Zero (Standard) adjust pen(s) to right side of the chart with the ZERO control(s).
1. Connect signal positive (+) to
BLACK post
2. Connect signal negative (-) to
RED post
B.
For LEFT Hand Zero adjust pen(s) to left side of chart with the ZERO control(s). Pen(s) will drive to the right.
1. Connect signal positive (+) to
RED post
2. Connect signal negative (-) to
BLACK post
7

1.
Refer to "Set-Up Procedures" in
MAINFRAME MANUAL before proceeding.
2.
Check that the REC/STBY switch(es) are in STBY position and the POWER is
ON.
3.
Set the INPUT RANGE and mV/V switch(es) to the desired input range
(SPAN).
4.
Set the CHART SPEED switch to the desired cm/min or cm/hr speed.
5.
Turn CHART switch ON.
6.
Adjust pen (s) to proper ZERO position using ZERO control (s).
7.
Set REC/STBY switch (es ) to REC and proceed with recording.
Output factory set to 100 millivolts. Customer adjustable from zero to +5 volts output.
Figure 3 mV/Volt Module Front Panel Controls
8

Item
Knob, RANGE
Knob, CAL/ATTEN
Knob, ZERO
Bracket, Binding Post
Cover, Module
Front Panel, Blank
Front Panel, mV/Volt Module
Switch, RANGE
Switch, REC/STBY
Switch, mV/V
Post, Binding, 5-Way, BLACK
Post, Binding, 5-Way, RED mV/Volt PCB Assembly
Part Number
9501-1577
9501-1578
9501-1578
9050-0164-01
9001 -1222
9050-0155
9050-0159-01
5130-0017
5110-0039
5110-0039
2139-0001
2139-0002
9800-0059
Modules, Plug-In
MILLIVOLT, MODEL 21
CURRENT, MODEL 22
TEMPERATURE, MODEL 23 pH, MODEL 24
STRAIN GUAGE, MODEL 28
Chart Paper
MODEL 2010
Paper, Roll, 100mm Chart x 30 Meters Long pH Paper, Roll, 100mm Chart x 30 Meters Long
MODEL 2020/2030
Paper, Roli, 200mm Chart x 25 Meters Long
Pens
MODEL 2010/2020/2030 (SHORT NIB)
Blue
Red
Black
Green
MODEL 2030 (LONG NIB)
Blue
Red
Black
Green
Part Number
0021-0000
0022-0000
0023-0000
0024-0000
0028-0000
Part Number
0100-0011-06
0100-0041-06
0100-0026-06
0100-0105-06
0100-0106-06
0100-0107-06
0100-0108-06
0100-0109-06
0100-0110-06
0100-0111-06
0100-0112-06
9

MODULE CONNECTIONS
J-1/P-1
PIN # DESCRIPTION
3
4
1
2
+ INPUT (AUX)
N/C
- INPUT (AUX)
N/C
SERVO (MOTHER) BOARD CONNECTIONS
J-5/P-5
7
8
5
6
+ OUTPUT BUFFER
N/C
CHASSIS GND
N/C
PIN #
9 + SIG OUTPUT
10 N/C
11
12
+ SIG OUTPUT (AUX)
N/C
13 SIG GND
14 N/C
15
16
REMOTE CHART (AUX)
REMOTE CHART
17 + 8V
18 N/C
19
20
+ 4V
N/C
21 OV GND
22 N/C
23
24
+ UNREGULATED
REMOTE ON/OFF - OUT
17
18
25 REMOTE ON/OFF - IN (AUX) 19
26 REMOTE ON/OFF - IN 20
13
14
15
16
9
10
11
12
7
8
5
6
3
4
1
2
DESCRIPTION
CHASSIS GND
N/C
+ SIG INPUT
N/C
N/C
N/C
SIG GND
N/C
REMOTE CHART (AUX)
REMOTE CHART
+ 8V
N/C
+ 4V
N/C
OV GND
N/C
+ UNREGULATED
REMOTE ON/OFF - IN
REMOTE ON/OFF - OUT (AUX)
REMOTE ON/OFF - OUT
* * * NOTE * * *
Wiring to Pins 1, 2, 4 and
6 of J-1 NOT connected at other end
25
26
27
28 * * * NOTE * * *
29
Pins 5 and 3 ARE connected 30 to rear terminal strip
“+” and ‘’-”
31
32
33
34
21
22
23
24
N/C
N/C
SERVO POT + 4V
SERVO MOTOR 1
SERVO MOTOR 2
SERVO POT + 8V
SERVO POT WIPER
CHASSIS GND IN FROM REAR PANEL
EVENT MARKER
AC POWER IN
AC POWER IN
+ UNREGULATED OUT
OUTPUT (PEN LIFT) GND
N/C
10

Please refer to the Specification Plate for the complete model number, serial number, and series number when requesting service, replacement parts or in any correspondence concerning this unit.
All parts listed herein may be ordered from the Barnstead|Thermolyne dealer from whom you purchased this unit or can be obtained promptly from the factory. When service or replacement parts are needed we ask that you check first with your dealer. If the dealer cannot handle your request, then contact our Customer Service Department at 319-556-
2241 or 800-553-0039.
Prior to returning any materials to Barnstead|Thermolyne Corp., please contact our
Customer Service Department for a “Return Goods Authorization” number (RGA). Material returned without a RGA number will be refused.
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Barnstead|Thermolyne Corporation warrants that if a product manufactured by
Barnstead|Thermolyne and sold by it within the continental United States or Canada proves to be defective in material or construction, it will provide you, without charge, for a period of ninety (90) days, the labor, and a period of one (1) year, the parts, necessary to remedy any such defect. Outside the continental United States and Canada, the warranty provides, for one (1) year, the parts necessary to remedy any such defect. The warranty period shall commence either six (6) months following the date the product is sold by
Barnstead|Thermolyne or on the date it is purchased by the original retail consumer, whichever date occurs first.
All warranty inspections and repairs must be performed by and parts obtained from an authorized Barnstead|Thermolyne dealer or Barnstead|Thermolyne (at its own discretion). Heating elements, however, because of their susceptibility to overheating and contamination, must be returned to our factory, and if, upon inspection, it is concluded that failure is not due to excessive high temperature or contamination, warranty replacement will be provided by Barnstead|Thermolyne. The name of the authorized
Barnstead|Thermolyne dealer nearest you may be obtained by calling 1-800-446-6060
(319-556-2241) or writing to:
Barnstead|Thermolyne
P.O. Box 797
2555 Kerper Boulevard
Dubuque, IA 52004-0797
USA
FAX: (319) 589-0516
E-MAIL ADDRESS: mkt@barnstead.com
Barnstead|Thermolyne’s sole obligation with respect to its product shall be to repair or (at its own discretion) replace the product. Under no circumstances shall it be liable for incidental or consequential damage.
THE WARRANTY STATED HEREIN IS THE SOLE WARRANTY APPLICABLE TO
Barnstead|Thermolyne PRODUCTS. Barnstead|Thermolyne EXPRESSLY DISCLAIMS
ANY AND ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR USE.
2555 Kerper Blvd.
P.O. Box 797
Dubuque, IA 52004-2241
Phone: 319-556-2241 800-553-0039
Fax: 319-589-0516
E-Mail Address: mkt@barnstead.com
ISO
9001
REGISTERED
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