RKI Instruments GD-70D Series - Manual (Page 14)

1 Overview 1-6. Block diagram
GD-70D - 14 -
<Wall-mounted Unit>
1-6. Block diagram
<Electric Diagram>
Mounting hole: A hole for wall-mount.
Terminal plate: A terminal to which a power supply, signal
cables and other external wires are connected (10P).
Lock lever: A lever to lock the main unit.
Sensor unit
Controller
(CPU)
Flow
sensor
Pump
POWER
INPUT(DC:24V)
Power supply
Gas alarm contact (ALM1,
ALM2)
Fault alarm contact (FAULT)
* Standard setting of contact
activation
• De-energized
(De-energized at a
normal environment)
• ON-ALARM
(Closed contact at an
alarm time)
Alarm contact controller
Transmitter
4-20 mA specification: 4-20 mA
DC Transmission
NT specification: digital data
transmission
Pump
control
circuit
Amplifier
Controller
(CPU)
Display
(POWER)(ALM1)(ALM2)(FAULT)
LCD
Operating unit
(MODE)(▲)(▼)(TEST/SET)