RKI Instruments GD-70D Series - Manual (Page 38)

4 Detection Mode 4-3. External output operation
GD-70D - 38 -
4-3. External output operation
Specifications 4 - 20 mA Power-line communication system (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 -
c Detection Mode (No Alarm) 4 - 20 mA (concentration output) Concentration data
d Detection Mode (Gas Alarm) 4 - 20 mA (concentration output) Concentration data, Alarm bits
e Initial Clear Depending on the setting of
f
2.5 mA setting: 2.5 mA
4 mA, HOLD, 4-20 mA setting: 4 mA*
Initial bit
f 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
g Alarm Test Output ON setting: 4 - 20 mA (concentration output)
Output OFF setting: In accordance with setting of
f
Concentration data, Adjustment bit, Test bit
h Fault Alarm 0.5 mA (Fixed) Fault bits
i Inhibit Depending on the setting of f
2.5 mA setting: 2.5 mA
4 mA, HOLD, 4 - 20 mA setting: 4 mA*
Concentration data, Adjustment bit, Inhibit bit
j Power Off 0 mA Signal OFF
* OSU - 0 - 25 vol% is equivalent of AIR (20.9 vol% = 17.4 mA)