MAMAC Systems Low Pressure Sensor PR-275-R8-MA

Calibration of PR-274/275 mA Units

Connect terminals [+] and [-] to the appropriate power source.

Connect the DVM in series on the [-] terminal.

Adjust Zu trimmer for uni-direction or Zb trimmer for bi-direction to achieve desired low output.

Adjust span trimmer [S] to obtain the desired high output pressure.

Repeat steps 3 and 4 until desired calibration is achieved.

Verify that the unit meets or exceeds published specifications.

Ensure hot wire is on the [+] terminal if using grounded AC.

Use an isolation transformer if the controller lacks built-in isolation.

Avoid powering from transformers used for non-isolated full-wave rectifier power supplies.

Connect all 24G power leads to the same power lead on all devices when using the same transformer.

Maintain correct phasing when powering multiple devices from a single transducer.

Wiring PR-274/275 Units with mA Output

Remove the terminal block by carefully pulling it off the circuit board.

Locate the [+] and [-] terminal markings on the board.

Verify that the unit is mounted in the correct position

Verify appropriate input signal and supply voltage

Caution: Never connect 120 VAC to these transducers. Never connect AC voltage to a unit intended for DC supply.

Verify appropriate configuration range

Adjust the pressure to obtain maximum output signal for appropriate range

Enter the maximum output signal value

Is the maximum output signal 20 mA or 5 or 10 VDC?

Adjust the pressure to obtain minimum output signal

Disconnect power supply before installation to prevent electrical shock and equipment damage.

Make all connections in accordance with the job wiring diagram and in accordance with national and local electrical codes. Use copper conductors only.

Use electrostatic discharge precautions (e.g., use of wrist straps) during installation and wiring to prevent equipment damage.

Avoid locations where severe shock or vibration, excessive moisture or corrosive fumes are present.

Ensure NEMA Type 4 housings are used for outdoor installations to provide protection against wind-blown dust, rain, and hose-directed water.

Do not exceed ratings of the device.

Ensure condensate or moisture does not enter pressure sensor ports.