Installation
CAUTION:
1.INCORRECT ELECTRICAL CONNECTIONS CAN, IN CERTAIN CIRCUMSTANCES, DESTROY THE ELECTRONIC OUTPUT CIRCUIT.
2.BEFORE APPLYING ELECTRICAL POWER, MAKE SURE THE SUPPLY VOLTAGE IS TO THE CORRECT RATING.
3.THIS A VERY SENSITIVE SENSOR, ONLY APPLY PRESSURE WITHIN THE PRESSURE RANGE.
Mounting
Two M5 threaded holes in the base of the sensor provide mounting points.
Note: The screws must not enter the holes more than 0.4" into the sensor body.
The installed position of the sensor should be away from sudden temperature variations, shocks and vibrations and should not be close to strong electromagnetic fields (transformers, motors etc.). The sensor can be mounted in any position, but mounting at an angle may require zero adjustment. For very low pressure sensors (less than 2.0 inH2O) the recommended mounting is horizontal.
PX548 Series (Unidirectional voltage output)
Minimum load 2 kW
Note: Connections 5 and 6 are common
If the output cable passes through an area of electrical disturbance, use a recommended load impedance of between 2 kW and 10 kW . Connect the load resistance between the wires corresponding to signal and - terminal at a point furthest from the sensor.
zero adjustment (fine)
zero adjustment (coarse)
square root output selection switch (optional)
gland nut (cable entry)
span adjustment
filter time response selector switch
terminal connector block
pressure connector
PX548 Series bidirectional operation using bipolar power supply (±12 Vdc) with bidirectional output (0±5 Vdc or 0±2.5 Vdc)
Connect the power supply to + for positive, - for negative, and 0 for neutral; connect the output to signal for positive and 0 for negative signal.
Minimum load 1 kW
Pressure connections
The high pressure connector is marked + and the low pressure connector is marked
Purging or
Two 5 mm hexagonal socket bleed screws are located on the outer casing and can be loosened to bleed the two pressure connectors. Make sure that these screws are tightened after this operation.
Internal detail
Electromagnetic Interference
To avoid electrical interference, use shielded cable with the shield connected to the earth ground at both ends. The ground of the sensor can be the casing or the ground terminal screw.
Electrical connections
PX548 Series (current output)
The maximum allowable load resistance is calculated to formula:
R Max = 0.05 (V supply - 10) kW
Where: R Max in kW and V in Volts
Note: It is possible to changeover the bleed screws and pressure connectors enabling easier access or permitting installation in a difficult position.
Square root output option
This option only applies to the LPX 5000 sensor with 4 to 20 mA two wire connection and the square root electronics assembly fitted. A switch next to the terminal block selects the output mode.
Switch | Output mode |
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OFF | Linear |
ON | Square root |
Filter response time
The filter response time of the sensor, additional to the
Switch | Filter response time |
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A | 200 milliseconds | Example: |
B | 400 milliseconds | Switch A+B = 600 milliseconds |
C | 1 second |
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Note: A hollow point is visible when a switch is in the 'on' position.