4200 Series Transmitters
Instruction Manual
Form 5596
July 2005
17
blocks (TB1 and TB2) in the field wiring
compartment. Refer to the Calibration section for the
test setup.
Calibration
Note
The potentiometer alignment
procedures, in the Installation section,
must be completed before performing
instrument calibration. Also, be sure
the direct or reverse action is correct
for the application.
Calibration of the instrument consists of adjusting
the zero and span of the transmitter and/or adjusting
the high and low position switches for a specific
travel. The high and low position switches also have
deadband adjustments that are made during the
calibration procedures. Refer to figure 7 for
transmitter and position switch conditions.
For a Type 4212 or 4222 instrument with position
switch circuits only, refer to the high and low position
switch adjustment procedures in this section. For a
transmitter with or without position switch circuits,
refer to the transmitter circuit zero and span
adjustment procedures in this section.
If satisfactory results cannot be obtained during
calibration, refer to the appropriate procedures in the
Maintenance section.
Test Equipment Required
The following test equipment is used in the
calibration and maintenance of the instrument:
D
Digital voltmeter (DVM) that measures voltages
in the range of 0 to 30 volts dc with an accuracy of
±
0.25 percent.
D
Power supply capable of supplying 20 to 30 volts
dc at 100 milliamperes.
D
Resistor, 250 ohms, 0.1%, 0.5 watt or greater.
Test Connections to the Field Wiring
Compartment
During calibration setup the transmitter as shown in
figure 8. Except for Type 4211 and 4221
transmitters, the field circuit printed wiring board is
used. A Type 4211 or 4221 transmitter uses a
barrier strip (key 11, figure 4) mounted in the field
wiring compartment for field wiring connections. For
calibration and bench check of the 4211 or 4221
transmitter, make connections to the barrier strip
(key 11).
For a Type 4210, 4215, or 4220 transmitter with
position switches, the transmitter can be calibrated
with or without the position switch outputs being
connected.
Note
On units with position switches, the
(R) terminal on TB3 must be connected
to the power supply negative (−)
terminal for proper instrument
operation, even if the position switch
outputs are not used.
For a Type 4211 or 4221 transmitter without position
switches, use a two wire system with the indicating
device installed as shown in figure 8.
Transmitter Circuit Zero and Span
Adjustment
WARNING
On an intrinsically safe instrument, the
current monitoring across TP1 and
TP2 during operation must be with an
approved meter. Personal injury or
property damage may result from fire
or explosion if an approved meter is
not used in a hazardous area.
Calibration of the transmitter consists of adjusting
the zero and span for a 1 to 5 volt dc output across a
250 ohm resistor, or a 4 to 20 milliampere output
