CLH-II can power (24VDC) and read 2-wire transmitters to perform field calibration. Output currents are adjustable with a 10 microamp resolution in both source and transmitter simulation mode.

FIXED STEPS: The calibrator can source or simulate fixed calibration currents to test or calibrate receivers and to stroke valves. Different current levels are obtained from a menu.

4-20mA lin 4 - 8 - 12 - 16 - 20mA
0-20mA lin 0 - 5 - 10 - 15 - 20mA
4-20mA sq.rt (flow) 4 - 5 - 8 - 13 - 20mA
0-20mA sq.rt (flow) 0 - 1.25 - 5 - 11.25 - 20mA
4-20mA valve 3.8 - 4 - 4.2 - 12 - 19 - 20 - 21mA

Output currents can be changed manually or automatically.
Time between steps is 10 seconds in the auto- stepping mode. In the valve series, auto-stepping will be:
3.8 - 4 - 4.2 or 19 - 20 - 21mA

RAMPING The calibrator can source or simulate with high resolution a continuous up/down cycling between 4 and 20mA or 0 and 20mA. The travel time between limits is 60 seconds.

READING IN PERCENT The calibrator can display readings in percent of a 4-20mA or 0-20mA span.
Unit also reads or simulates dP-transmitters directly in percent of flow.