PC2E-0330

For safe handling of high boiling point solvent drying equipment

Outline drawings
Main unit case
Housing

Wind guardLid510

ΦA15]
4-Φ 12rMo[FFlame-proof
Furnace Safety Monitor

AA-A cross-section view
[Flange mounting hole view]

Display area

458

148

83
（125）

250
(length of furnace insertion section)

Φ34

167

119

Φ130

Gas sensor unitGasket
10

Mounting flange

NMP model
MODEL

External cable entry
For power supply/signals

GD-A2400 Flame-proof enclosure(Ex db ⅡC T3 Gb)
SD-2500

Specifications
Model
Detection principleDetection gas
Detector method
Type of protection

GD-A2400

Explosion-proof classOperatingtemperature range
Detection range
Display
Alarm delay

SD-2500
SD-2600
Catalytic combustion typecombustible gas
Direct insertion type
Flame-proof enclosure

General combustible gas model
MODEL
Type of protection

SD-2700

Non-explosion

IECEx Ex db ⅡC T3 Gb
IECEx Ex db ⅡC T2 Gb
ATEX Ⅱ2G Ex db ⅡC T3 Gb
ATEX Ⅱ2G Ex db ⅡC T2 Gb—Japan Ex Ex d ⅡC T3
Japan Ex Ex d ⅡC T2insertion section:
Furnace insertion section:
Furnace insertion section: 0 to +160°C（no sudden changes） Furnace
0 to +200°C (no sudden changes)
0 to +250°C (no sudden changes)
Main unit case (ambient temperature):
Main unit case (ambient temperature): Main unit case (ambient temperature):
0 to +50°C (no sudden changes)
0 to +50°C (no sudden changes)
0 to +50°C（no sudden changes）
1
0 to 100%LEL*
0 to 100％LEL
Depending on reading alarm unit
7 segment LED（4 digit）display
Within 30 seconds（time taken for
Within 30 seconds
an alarm to be issued when gas（Timetakenfor
analarm to be issued when gas withwith 1.6-times the alarm setting
1.6-times the alarm setting concentration is detected.）
concentration is detected.) *1
Depending on reading
alarm unit

External output

Type of protection

Operating temperature range Concentration Display Area
0 to 160°C

Displayed when connected
to separate reading alarm unit
Integrated into main unit

Operating temperature range Concentration Display Area

SD-2600

Flame-proof enclosure(Ex db ⅡC T2 Gb)

0 to 200°C

SD-2700

Non-explosion-proof

0 to 250°C

Integrated into main unit

IECEx
ATEX
TIIS (Japan Ex)
UL

Gas concentration signal/alarm contact（Gas alarm or fault alarm, or common gas/fault alarm)

CVVS, 1.25 sq, 4-core
Transmission cable
CVVS, 1.25 sq, 3-core（CVVS, 1.25 sq, 5-core for alarm contact）
Supplied from reading alarm unit
24VDC ± 10%, power consumption approx. 3 W（MAX）
Power supply
Outer dimensions/weight Approx.148（W）×167（H）× 458（D）mm（excluding protrusions）Furnace insertionsection: Φ34 × 250/Approx. 4.6kg
Standard accessories

Dedicated control lever, flange
gasket, exhaust direction nameplate

Dedicated control lever, dedicated control key,flange gasket, exhaust direction nameplate*1 If connected to a reading alarm unit

Able to detect high boiling point solvents
Flame-proof testing temperature range(0 to +160°C)(0 to +200°C)
Can be used at 200°C or more (Operating temperature range: 0 to 250°C SD-2700 )Accurately detects concentration at center of equipment
Concentration display area integrated into main unit
SD-2700 )(no need for dedicated indicator unit
Easily make adjustments by simply tapping control keys

2-7-6 Azusawa, Itabashi-ku, Tokyo 174-8744, Japan

Phone
Telefax
E-mailWeb: +81-3-3966-1113: +81-3-3558-9110: intdept@rikenkeiki.co.jp: https://www.rikenkeiki.co.jp/english* The contents described in this catalog aresubject to change without notice according
to the performance improvement.

PC2E-0330-211000 S

Why does equipment need to be explosion proof?

Example of System Configuration

High boiling point solvents are vaporized inside drying equipment,
and can generate a mixture of explosive gases

Example of connection with host system (DCS, PLC)

Locations inside dry equipment can be dangerous

Host system(DCS, PLC)Class 1 hazardous zone: A location where an explosive atmosphere can be generated under normal conditions
Class 2 hazardous zone: A location where an explosive atmosphere is not generated under normal conditions
and will be present for only a short time even if it is generated

Relay terminal blockSD-2500
2600
2700

Electrical machinery and equipment used in dangerous locations musthave explosion-proof performance(Industrial Safety and Health Act Article 280）
Explosion-proof electrical equipment must be selected to suit the(Explosion Prevention Guidelines）
ambient temperature
The explosion-proof performance (pressure-resistant explosion-proof structure) of
this device means it can be used in dangerous locations!
It has a wide operating temperature range of up to 160°C for the GD-A2400 andSD-2500, and up to 200°C for the SD-2600!

Detector

CVVS 3-core

The SD-2500, SD-2600 and SD-2700
outputs a 4-20 mA gas concentration signal.
This means concentrations can bemonitored with host systems (DCS, PLC)!

Power supply
24VDC

Can be used safely within drying equipment!

Why is a long insertion section required?
Gas concentrations within drying equipment or exhaust ducts may not be even
Gas

High-concentration gas
Inside duct

Reading alarm unit

Inside ductLow-concentration gas

Example of connection with reading alarm unit
Detector
GD-A2400

Mounted on site
Withinfurnace

Furnacewall

Outside furnace

GP-5001

Gas
Inside duct
High-concentration gas

250 mmGas

GP-591GP-6001

CVV 4-core

Low-concentration gas

For safety reasons, high concentrations of gases within drying
equipment or exhaust ducts must be detected
The insertion section of the gas detector needs to be a certain length inorder to detect locations with high concentrations of gas
The length of the insertion section of this device is 250 mm!
This enables detection of locations with high concentrations of gases
within drying equipment or exhaust ducts!

GD-A2400 has the same output
signal as that of GD-A250, so
concentrations can be monitored
using existing reading alarm units!