4200 Series Transmitters
Instruction Manual
Form 5596
July 2005
18
NOTES:
CONNECT DVM TO TEST POINTS AS DIRECTED BY CALIBRATION AND
MAINTENANCE PROCEDURES.
INSURE THAT THE CONNECTOR ATTACHED TO J1 (VIEW A) IS NOT
REVERSED WHEN INSTALLING IT ON THE PRINTED WIRING BOARD.
THE INDICATING DEVICE CAN BE A VOLTMETER ACROSS A 250 OHM
RESISTOR OR A CURRENT METER.
SEPARATE RETURN LEAD REQUIRED FOR RELAYS. RETURN WIRE
MUST BE CONNECTED EVEN IF RELAY OUTPUTS ARE NOT USED.
4
3
1
2
49A7894-B
39A6156-F
B1948-4 / IL
J3
J1 FROM
RFI FILTERS
TO RFI
FILTERS
J1
(SEE VIEW A)
VIEW A
+ 24 VOLT
DC POWER
SUPPLY
TRANSMITTER COMPARTMENT
FIELD WIRING
COMPARTMENT
Figure 8. Calibration and Bench Check Test Setup
current for a specific travel. If necessary refer to the
type number on the nameplate to determine the
configuration of the transmitter.
1. Remove power from the instrument.
2. Connect the transmitter as shown in figure 8.
3. Remove the transmitter covers.
4. Stroke the valve or device to the mid-stroke
position
5. Check the potentiometer alignment by connecting
a digital voltmeter (DVM) as follows:
a. For all transmitters (except a Type 4212 or
4222) connect between TP3 (+) and TP4 (−) on
the printed wiring board.
b. For a Type 4212 or 4222 transmitter, connect
the DVM between TP5 (+) and TP6 (−).
6. Apply power to the instrument.
7. The DVM should read 1.25
±
0.05 volts dc. If not,
perform the potentiometer alignment procedures in
the Installation section.
8. Stroke the valve or device to the point of travel
where the transmitter output is to be 4 milliamperes
dc.
9. Adjust the zero potentiometer (R1 or R15,
figure 5) until the output is 4 milliamperes dc (1.00
volt across 250 ohms).
10. Stroke the valve or device to the point of travel
where the transmitter output is to be 20 milliamperes
dc.
11. Adjust the span potentiometer (R2 or R16,
figure 5) until the output is 20 milliamperes dc (5.00
volts across 250 ohms).
12. Some small interaction between the two
adjustments may occur. Repeat steps 8 through 11
until the error is within the application requirements.
13. For a Type 4211 or 4221 transmitter without
position switches, calibration is complete. Refer to
the installation and/or operating information to place
the transmitter in service.
14. If calibration is complete, replace the transmitter
covers. For transmitters with position switches, refer
to the high and low position switch adjustment
procedure below.