Riken Keiki GD-3EC, Technical Manual

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1. Product Overview 1-2 Intended use and features
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<List of detection target gases by model (remote sensor type)>
Main unit model SD-3SC
Remote
sensor head
model
Detection
method
Detection principle
Detection target gas
Remarks
Combus-
tible gas
Toxic
gas
Oxygen
GD-3RI
Diffusion
Non-dispersive infrared
absorption type
(infrared type)
〇 〇
GD-3NC New ceramic type
〇
GD-3GH Semiconductor type 〇 〇
GD-3GHS Semiconductor type
〇
CS
2
(carbon disulfide)
only
GD-3SP
Hot-wire semiconductor
type
〇 〇
GD-3EC Electrochemical type 〇 〇
GD-3ECS Electrochemical type
〇
H
2
S (hydrogen sulfide)
only
GD-3ECB Electrochemical type 〇 With EC barrier*
*Differs depending on detection target gas.
<Sensor models and detection principles>
Sensor model Detection principle
IRF Infrared type
NCF New ceramic type
SGF Semiconductor type
SHF Hot-wire semiconductor type
ESF Electrochemical type
1-2-3 Product features
<Standard specifications>

The product is constructed with a stainless steel housing suitable for both indoors and outdoors use.

Requires a 24 V DC (DC 18 V to 30 V) power supply.

The gas concentration, status, and command selection menu are displayed using seven-segment LEDs.

The concentration of the gas detected is converted to a 4 - 20 mA analog output (NAMUR NE43 compliant)
or a digital HART output signal.

It can be connected to a Riken Keiki monitoring system or programmable logic controller (PLC) via a ceiling
fitting or approved cable gland.
<Optional specifications>

The product can be operated as a standalone unit by setting an alarm relay. Using the product as a
standalone unit allows control of devices without the need for a central controller.* 1
*1: Using the product as a standalone unit requires additional alarm signal settings.