Ronan X90 Series - Manual (Page 6)

module is not necessary in order to change wiring.
Grommeted holes are provided on the top and
bottom surfaces of the chassis for cable entry and
exit. Overall dimensions are 7.25” high X 4.5” wide
X 5.75” deep (18.42 cm X 11.43 cm X 14.6 cm).
Refer to drawing number C-1359-K for terminal
designations for power wiring and hook-up to the
remote probe driver board.
7.3 Integral Model X90-1005
Refer to drawing A-1697-K for rear-panel input
power wiring connections and relay contact wiring
connections.
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8.0 CALIBRATION CONTROLS
The following front-panel controls are used in the set-up
procedure.
ZERO CONTROL is used to provide a zero voltage
signal at TP-AMP with the process level below the point
of measurement, under conditions of maximum radiation
at the G-M tube.
SPAN is used to provide a + 1.0 voltage signal at TP-
AMP when the process level is above the point of
interest, under conditions of no radiation on the G-M
tube.
Three light-emitting diode (LED) DISPLAYS are
provided. These indicators will signal normal and level
alarm for process conditions and failure alarm.
The AMP TERMINAL is the output of the voltage
integrator. This output increases as the radiation on the
tube decreases and vice versa.
Calibration should be attempted only after all system
components have been securely mounted in position and
power and other connections made where required.
Check also that the correct jumpers have been installed
on the X90-301(V) or X90-1005 printed circuit board.
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9.0 CALIBRATION—GENERAL
The output at the AMP terminal is a measure of level
present at the detector. This reading will be minimum or
near zero when the detector is fully irradiated (no
process) and the maximum or near 1.0 V when there is
process material between the source and the detector.
Therefore, for calibration any option, two voltage
readings are generated: 0.0 V with no process between
the source and the detector and + 1.0 V with process
between the source and the detector.
9.1 Calibration with Process Material
a) Switch on the power to the X90 and turn the
shutter handle on the source holder to the ON
position. Turn the SPAN control clockwise 20
turns; then 10 turns counterclockwise.
b) Lower the process level below the set limit and
adjust the ZERO control so that the AMP terminal
output is zero.
c) Raise the process level above the set limit and
again measure the voltage at the AMP terminal.
d) Adjust the SPAN control to obtain a reading of +
1.0 V at the AMP terminal.
After the switch has been calibrated using the
above method, the operation of the control relay,
NORMAL and ALARM indicators should be
checked by raising and lowering the process level
about the set limit. If all these operate as required,
the switch is considered calibrated.
9.2 Calibration without Process Material
a) Turn the source holder shutter to the ON
position.
b) Turn the SPAN control clockwise 20 turns; then
10 turns counterclockwise.
c) Take voltage reading at the AMP terminal.
Adjust the zero control to obtain an average 0.0 V
reading at the AMP terminal.
d) Turn the source OFF.
e) Adjust the SPAN control for an average + 1.0 V
reading.
f) Turn the source back ON for operation.
9.3 Time Delay
If false alarms occur, increase the time delay by
moving the delay jumpers on the printed circuit
board to a higher value.
9.4 Response Time
The response time of the amplifier is 0.5 to 40
seconds, depending on the SPAN setting.
Device Install
High limit switch High and G
Low limit switch Low and G
Process alarm only A-10, B-11, C-12
Process alarm and failure
alarm Failure relay and D-10, E-11,
F-12
Delays Select one: 0.1 sec., 5 sec.,
10 sec., 20 sec.