Instruction 5700-9001
GDA-1600 16-Channel Controller
33
NOTE:
If sensor wires are long, it may be necessary to measure the excitation
voltage at the sensor end to compensate for I
2
R losses in the wiring.
3.
With the minus voltmeter lead on TB2-2 (common), connect the plus lead to the
channel’s test point. With zero air on that sensor, adjust its
Balance
potentiometer for 0.4 volts at the test point.
4.
Apply 50% LEL combustible span gas to the sensor and allow the test point
voltage to stabilize. Two volts = 100% input to the A – D Converter and 0.4 volts
= 0%; therefore, 1.2 volts = 50%. Place the 3-position
Coarse LEL Gain
jumper
into the position which reads between 0.8 volts and 1.2 volts on the test point with
50% LEL gas on the sensor. Gain settings for each jumper position are as
follows: No jumper = 1, LOW = 7, MED = 21, HI = 41. Multiple jumpers have
an additive affect upon gain, so the LOW and MED jumpers together provide a
gain of 28.
Initial setup is now complete and normally only requires repeating if a sensor is replaced.
Final calibration of this channel may now be performed using the GDA-1600’s electronic
Cal Mode feature described in section 3.2.1.
Figure 4
.5
– Catalytic Bead Sensor Layout
Summary of Contents for GDA-1600
Page 21: ...Instruction 5700 9001 GDA 1600 16 Channel Controller 21 Figure 3 10 Configuration Menus ...
Page 28: ...GDA 1600 16 Channel Controller Instruction 5700 9001 28 Figure 4 2 Main PCB ...
Page 36: ...GDA 1600 16 Channel Controller Instruction 5700 9001 36 Figure 4 7 Analog Output Board ...
Page 38: ...GDA 1600 16 Channel Controller Instruction 5700 9001 38 Figure 5 2 System Diagnostic Options ...
Page 53: ...Instruction 5700 9001 GDA 1600 16 Channel Controller 53 ...
