RKI Instruments GD-K77D User Manual
Page 41
Model GD-K77D
Operator’s Manual
Maintenance • 36
Replacing Components of the GD-K77D
This section describes how to change the sensor, pump, and fuse.
Replacing the Sensor
1.
Turn off the GD-K77D power switch. Also verify that the power to the unit is off.
2.
Loosen the thumbscrew on the front of the cover and pull the cover away.
3.
Loosen the detector unit set screw and carefully pull the detector unit away from the
wall mounting bracket.
4.
Disconnect the sensor cable on the right side of the sensor from the sensor. Gently
pull on the connector to disconnect it.
5.
A metal snap-in bracket holds the sensor in place. Push this bracket to the left until it
releases the sensor.
6.
Gently push the sensor back, away from the sample cup, and slide it out of the right
side of the detector unit.
7.
Install the new sensor into the sample cup.
8.
Reconnect the sensor cable to the sensor.
9.
Reinstall the sensor retaining bracket.
10. Reinstall the detector unit and cover.
11. Turn power on and turn on the GD-K77D.
12. Set the sensor start time. See the Setting a Sensor’s Start Time section on p.38.
13. Allow the unit to warm-up for 2 hours.
14. Calibrate the sensor as described in the Calibration section.
Replacing the Pump
1.
Turn off the GD-K77D power switch. Also verify that the power to the unit is off.
2.
Loosen the thumbscrew on the front of the cover and pull the cover away.
3.
Loosen the detector unit set screw and carefully pull the detector unit away from the
wall mounting bracket.
4.
A metal snap-in bracket holds the pump in place. A tab from the bracket is accessible
on the right side of the detector unit. Push the bracket tab back until the bracket snaps
back and releases the pump.
5.
Gently pull the pump away from the detector unit.
6.
Disconnect the pump cable from the pump connector on the circuit board in the top of
the detector unit and remove the cable from the cable retainer near the connector.
7.
Connect the new pump’s cable to the pump connector and route the cable through the
cable retainer like the old pump’s cable.
8.
Install the new pump into the detector unit and snap the retaining bracket back on.
9.
Reinstall the detector unit and cover.
10. Turn power on and turn on the GD-K77D.
11. Verify that the flowmeter ball is between the red lines. Adjust the flow if necessary.