RKI Instruments GD-70D Series - Operation Diagrams

GD-70D - 14 -
Galvanic cell type
(OSU)
• Do not disassemble the sensor unit because it contains electrolyte. If contact
occurs, rinse the area immediately with a large quantity of water.
• The sensor unit must be stored under normal temperature/humidity in a clean
place away from direct sunlight.
3-4 Operation Diagrams
<Electric Diagram>
Sensor unit
Controller
(CPU)
Flow
sensor
Pump
POWER INPUT (24
VDC)
Power supply part
Gas alarm contact
(ALM1, ALM2)
Fault alarm contact
(FAULT)
* Standard setting of
contact activation
De-energized
(De-energized at a
normal state)
ON-ALARM
(Closed contact at
an alarm state)
Alarm contact controller
Transmitter
(4 - 20 mA/NT/
EA specification)
Pump
control
circuit
Amplifier
Controller
(CPU)
Display
(POWER) (ALM1) (ALM2)
(FAULT)
LCD
Operating unit
(MODE) (▲) (▼) (TEST/SET)
4 - 20 mA specification:
4 - 20 mA DC transmission
NT specification: Digital
data transmission
EA specification: Ethernet
and 4-20 mA DC
transmission
LN specification: confirm to
LONWORKS