Baker Hughes Becker Series, Инструкция по эксплуатации

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Becker Digital Natural Gas Positioner Instruction Manual | 45 © 2022 Baker Hughes Company. All rights reserved.
Main Shift Gear
Transmitter Gear
Adjustment Screw 20mA
for close on increasing
Clockwise mA Adjustment
Screw 4 mA for close on
increasing
Rotary Transmitter 4-20 mA Calibration Procedure for CS
1. Mount the rotary transmitter to the actuator. Set limit switches if supplied per instructions provided with
the transmitter.
2. Connect a loop power source to terminal points 1 and 2 (see markings on inside of unit cover). The
multi-meter (set for mA readings) must be connected in series with the terminal 1 (refer to unit wiring
diagram for the standard setup procedure) .
3. Stroke the valve to fully clockwise extreme.
4. Press the main shaft gear disengaging it from its locking position. Take extreme care not to turn the main
shaft gear, to insure you maintain proper switch settings.
5. With main shaft gear pressed, turn the transmitter gear to the fully counterclockwise position, and note
the reading (mA) of transmitter. Turn the transmitter gear clockwise until the transmitter changes no more
than 0.5 mA from the previous reading. Reengage gears (if equipped with mechanical switches, press
the switch plunger to allow gear to engage).
6. Turn th e clockwise mA adjustment screw to adjust the transmitter reading to the desired output for this
valve position (typically this is 4 mA or 20 mA).
7. Stroke the valve to the fully counterclockwise extreme.
8. Turn the counterclockwise mA adjustment screw to adjust the transmitter reading to the desired output
for this valve position (opposite of step 6).
9. Stroke the valve between the full clockwise and counterclockwise positions checking and readjusting the
(mA) output as necessary.
Figure 22 - Components of Rotary Transmitter for Calibration Procedure