RKI Instruments GD-K11D - Manual (Page 8)

4 • Description Model GD-K11D Operator’s Manual
Electrical System
The Model GD-K11D’s electrical system consists of the terminal strip, power switch, and
fuses (see Figure 1.)
Terminal strip
The terminal strip allows you make external wiring connections to the Model GD-K11D.
The nine-point terminal strip is divided into two rows. The upper (five-point) terminal
strip is for connection to a recorder or a controlling device, which accepts a 4 to 20 mA
signal. The lower (four-point) terminal strip is for connection to incoming power and
external alarms.
NOTE: See the “Installation” section on page 8 for all wiring procedures.
Power switch
The power switch turns power to the Model GD-K11D on and off. The power switch is
ON when the toggle switch is in the UP position.
Fuses
Two extractor-type fuses protect the AC line circuitry from short circuit or overload. The
fuses are rated at 1 amp.
Flow System
The Model GD-K11D’s flow system consists of the pump, flowmeter, flow adjust valve,
flow sensor, low flow light, gas in fitting, and gas out fitting (see Figure 1). The gas in and
gas out fittings were described earlier.
Pump
The pump pulls the test sample into the Model GD-K11D.
Flowmeter
The flowmeter measures the flow rate to the sensor. A ball in the flowmeter column
indicates the flow rate. Two horizontal lines on the flowmeter mark the acceptable flow
rate. Use the flow adjust valve to keep the flowmeter ball between the two lines.
Flow adjust valve
The flow adjust valve allows you to adjust the flow rate to the sensor.
Flow sensor
The flow sensor activates the low flow alarm if the flowmeter ball drops below the visible
part of the flowmeter.
Low flow light
The low flow light is near the top left corner of the main circuit board. The low flow light
is directly above the 50-pin connector. The main circuit board is behind the amplifier
circuit board. The low flow light turns on if the flowmeter ball drops below the visible part
of the flowmeter.