Precision Power PC400.4 Spécifications télécharger pdf (Page 9)

When powered through an approved barrier, Reed Switch

sensors are Intrinsically Safe.

Trouble Shooting the Sensor

CAUTION: Do NOT use an Ohm-meter to test

the reed switch sensor (pulser).

Remove the sensor from the flow meter, and expose the

red & black leads. This can be done at a convenient junc-

tion, or at the register.

 Measure the voltage between the red & black leads. It

should be equal to the voltage provided by the register.

 Pass a magnet across the tip of the sensor, the voltage

should switch to zero (less than 0.2 V).

If the magnet cannot activate switching of the sensor, then

the sensor has failed and must be replaced. There are no

alignment requirements for the Reed Switch sensor.

1 . 9

Reed Switch

This sensor is strictly for use with battery powered stand

-alone registers, where no external power source is avail-

able. If external power is available, Hall Effect pulser

should be used - even when the register is battery pow-

ered.

In so called ‘pulse meter’ service, either Hall Effect or

Quadrature Hall Effect pulser must be used - depending

upon the requirements of the receiving instrument.

The Reed Switch sensor (pulser) consists of a set of con-

tacts, hermetically sealed in a glass tube, protecting the con-

tacts from dirt and corrosion of the the outside world. Con-

tacts are actuated by an external magnetic field, provided by

permanent magnets inside the rotors.

This is a mechanical device with a finite life. To extend pulser

life, flow meters with Reed Switch pulser are only available in

‘low resolution’ version.

When the pulser starts to wear out, it rarely fails instantly.

Instead it starts to miss pulses. We recommend that the flow

meter be recalibrated on a regular basis. Once pulser failure

is detected, establish a schedule for pulser replacement as a

matter of normal maintenance.

Contact Rating:

 Volts DC max. : 30 VDC

 Amps DC max. : 0.01 A

 Watts DC max. : 0.25 W

 Initial resistance : 1.0 Ώ

 Operating Temp range : -40ºF/+300ºF (-40ºC/+150ºC)

 D-Must operate : 0.125” (3.2 mm)

 D-Must release : 0.400” (10.2 mm)

 Cable specifications:

24 AWG, foil shield & drain wire, blue PVC jacket, RoHS.

75VDC. Capacitance: 185 nF/km. Inductance: 0.65 mH/

km.

Standard with 18” (45 cm) leads. 120” (305 cm) optional.

BLACK

RED

Optional Sensors (pulsers)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 23 24

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Precision Power PC400.4 Spécifications Page 9

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