- 47 - GD-70D
6-2 Fault Alarm Activation
A fault alarm is triggered when the detector detects
abnormalities.
After a fault alarm is triggered, the FAULT lamp (yellow) lights up
and an error message is displayed on the LCD.
Determine the causes and take appropriate actions.
After the detector is successfully returned from the fault, it
restarts and goes through a normal warmup procedure.
If the detector has problems and is repeatedly malfunctioning,
please contact RKI immediately.
NOTE
For information on error messages and possible malfunctions, see Troubleshooting on page 116.
6-3 External Output Operation
● 4 - 20 mA/NT/EA Specification
Power-line communication system
(for GD-70D-NT)
Signal Transmission System Electric current transmission (non-isolated)
2-wire type DC power-line communication
system
Transmission Path CVVS KPEV-S
Transmission Distance Below 1 km
Below 300 m (depending on the system
designing conditions)
Connection Load Resistance Below 300 Ω -
Detection Mode (No Alarm) 4 - 20 mA (concentration output) Concentration data
Detection Mode (Gas Alarm) 4 - 20 mA (concentration output) Concentration data, Alarm bits
Initial Clear
Depending on the setting of
2.5 mA setting: 2.5 mA
4 mA, HOLD, 4-20 mA setting: 4 mA*
Initial bit
Maintenance Mode
2.5 mA setting: 2.5 mA
4 mA setting: 4mA*
HOLD Setting: the previous value retained
4-20 mA setting: 4 - 20 mA (concentration output)
Concentration data, Adjustment bit
Alarm Test
Output ON setting: 4 - 20 mA (concentration output)
Output OFF setting: In accordance with setting of
Concentration data, Adjustment bit, Test bit
Fault Alarm 0.5 mA (Fixed) Fault bits
Inhibit
Depending on the setting of
2.5 mA setting: 2.5 mA
4 mA, HOLD, 4 - 20 mA setting: 4 mA*
Concentration data, Adjustment bit, Inhibit bit
Power Off 0 mA Signal OFF
* 17.4 mA for oxygen units
* E-5 FLOW (flow rate abnormalities)
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