Riken Keiki GD-3EC, Technical Manual

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3. Product Configuration 3-3 Block diagrams
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3-3 Block diagrams
The block diagrams (electrical circuit diagrams) for the product are given below.
<SD-3>
Power supply voltage converter
HART modem
Control
unit
CPU
Power supply unit
24 V DC
External output
4 - 20 mA + HART
Display
7-segment LED
Alarm contact output (option)
1. Gas alarm output (ALARM1)
2. Gas alarm output (ALARM2)
3. Fault output (FAULT)
Contact operation
Normal measurement:
De-energized
Alarm state: Energized
Magnetic operation part
・
MENU/ESC
・ SET
・
▲
・ ▼
Sensor
Display (LED)
・ POWER
・ ALM1
・ ALM2
・ FAULT
・ PPM
・ %LEL
・ %