MAMAC Systems Low Pressure Sensor PR-275-R3-VDC

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 within the expected range (20 mA or 5 or 10 VDC)?

Adjust the pressure to obtain minimum output signal

Ensure the 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.

Ensure all 24G power leads are connected to the same power lead on all devices when using the same transformer.

Maintain correct phasing when powering more than one device from a single transducer.

Wiring PR-274/275 Units with VDC Output

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

Locate the terminal markings on the board

Calibration of PR-274/275 VDC Units

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

Connect the DVM on DC volts across [O] and [-] terminal.

Repeat low and high pressure calibration steps until desired calibration is achieved.

Select configuration type for low pressure calibration

Apply low pressure to the unit.

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

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.