Riken Keiki GD-84D-EX Series User manual

PT2E-3040
Gas Detector Head
GD-84D-EX Series
GD-84D-EX-EC
GD-84D-EX
GD-84D-EX-ET-EC
GD-84D-EX-ET
GD-84D-EX-EA-EC
GD-84D-EX-EA
Operating Manual

INDEX
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INDEX
1. Product Overview.......................................................................................................................................6
1-1 Introduction ..........................................................................................................................................6
1-2 Product intended use and features......................................................................................................7
1-2-1 Communication systems by model and corresponding sensors..............................................7
1-2-2 Product features .......................................................................................................................7
1-3 DANGER, WARNING, and NOTE .......................................................................................................8
1-4 Checking CE/UKCA marking ...............................................................................................................8
2. Important Safety Information ..........................................................................................................................9
2-1 Danger information ..............................................................................................................................9
2-2 Warning information.............................................................................................................................9
2-3 Caution information............................................................................................................................10
3. Product Configuration ..............................................................................................................................11
3-1 Main unit and accessories .................................................................................................................11
3-2 Part names and functions ..................................................................................................................13
3-2-1 Main unit part names and functions .......................................................................................13
3-2-2 Front panel and LCD screen part names and functions ........................................................15
3-3 Block diagram ....................................................................................................................................17
3-3-1 Electrical circuit diagram ........................................................................................................17
3-3-2 Piping diagram .......................................................................................................................20
4. Installation ................................................................................................................................................21
4-1 Installation precautions ......................................................................................................................21
4-2 System design precautions................................................................................................................22
4-3 Providing maintenance space............................................................................................................25
4-3-1 Maintenance space ....................................................................................................25
4-3-2 Maintenance space ............................................................................27
4-4 Installing the main unit .......................................................................................................................29
4-4-1 Installing the main unit (without the mounting plate for compatibility with the GD-70D)........30
4-4-2 Installing the main unit (using the mounting plate for compatibility with the GD-70D)...........33
4-5 Fitting sensors....................................................................................................................................37
4-5-1 Configuration of the main unit ................................................................................................37
4-5-2 Fitting sensors ........................................................................................................................39
4-6 Wiring procedure................................................................................................................................41
4-6-1 Recommended cables............................................................................................................41
4-6-2 Terminal plate specifications ..............................................................42
4-6-3 Terminal plate connections.....................................................................................................43
4-6-4 Grounding terminal connections.............................................................................................44
4-7 Pipe installation..................................................................................................................................46
5. Usage Instructions ...................................................................................................................................48
5-1 Preparations for startup .....................................................................................................................48
5-2 Turning on the power .........................................................................................................................49
5-3 Basic operation flow...........................................................................................................................51
5-4 User mode .........................................................................................................................................53
5-4-1 User mode setting items.........................................................................................................53
5-4-2 Switching to user mode ..........................................................................................................54
5-5 Performing air calibration (AIR) .........................................................................................................55
5-6 Checking setting values (user mode) ................................................................................................57
5-6-1 Checking the alarm setpoints (CONFIRM).............................................................................57
5-6-2 Checking flow values (FLOW)................................................................................................59
ET
4-20mA EA
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5-6-3 Checking the version of the main unit (84D VER)..................................................................60
5-6-4 Checking the sensor versions (SEN VER).............................................................................61
5-6-5 Checking the communication PCB version (NET VER) ................................61
5-7 Shutting down ....................................................................................................................................62
6. Alarm Activation .......................................................................................................................................63
6-1 Gas (oxygen) alarm pattern ...............................................................................................................63
6-1-1 Alarm Activation......................................................................................................................63
6-1-2 Contact operation (auto reset) ...........................................................64
6-1-3 Contact operation (self-latching) ........................................................65
6-1-4 Response when a gas alarm is triggered...............................................................................68
6-2 Fault alarm patterns...........................................................................................................................69
6-3 External output operations.................................................................................................................70
6-4 Various functions to ensure proper alarm activation..........................................................................73
6-4-1 Zero suppression function ......................................................................................................73
6-4-2 Zero follower function .............................................................................................................74
6-4-3 Sensitivity correction function.................................................................................................74
6-4-4 Calibration history, alarm trend history, and event history functions ......................................75
6-4-5 Automatic sensor recognition function ...................................................................................75
7. Maintenance.............................................................................................................................................77
7-1 Maintenance intervals and maintenance items .................................................................................77
7-2 Performing alarm tests.......................................................................................................................79
7-3 Maintenance (regular maintenance) mode........................................................................................81
7-3-1 Maintenance mode setting items ...........................................................................................81
7-3-2 Switching to maintenance mode ............................................................................................82
7-4 Performing a gas introduction test .....................................................................................................84
7-5 Performing calibration........................................................................................................................85
7-5-1 Running zero calibration.........................................................................................................85
7-5-2 Running span adjustment.......................................................................................................87
7-5-3 Connecting the calibration gas ...............................................................................................90
7-5-4 Disconnecting the calibration gas ..........................................................................................92
7-6 Adjusting the flow...............................................................................................................................93
7-6-1 Checking the flow (FLOW) .....................................................................................................93
7-6-2 Manually adjusting the flow (FLOW) ......................................................................................94
7-6-3 Correcting the flow value (DEF FLOW)..................................................................................95
7-7 Checking setting values (maintenance mode)...................................................................................96
7-7-1 Checking the date last calibrated (LAST CAL).......................................................................96
7-7-2 Checking the set potential (E VOLT)......................................................................................97
7-7-3 Checking the temperature of the detector (TEMP) ................................................................97
7-8 Setting the initial date of sensor use (S SET)....................................................................................98
7-9 Making changes in Environmental setting 1 ......................................................................................99
7-9-1 INHIBIT setting (INHIBIT) .......................................................................................................99
7-9-2 Alarm setpoints (ALM P).......................................................................................................101
7-9-3 Alarm delay time setting (ALM DLY).....................................................................................103
7-9-4 Fault alarm tests (F TEST) ...................................................................................................104
7-9-5 Terminal unit settings (OPT ACT) .....................................................106
7-10 Making changes in Environmental setting 2 ..................................................................................107
7-10-1 Date and time setting (DAY TIME) .....................................................................................108
7-10-2 Zero suppression value setting (SUPPRESS) ...................................................................110
7-10-3 Zero suppression type setting (SUP TYPE)....................................................................... 111
7-10-4 Settings for contacts during alarm tests (TEST RLY) .................... 113
ET EA
4-20mA EA
4-20mA EA
4-20mA EA
4-20mA EA

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7-10-5 Settings for external output during alarm tests (TEST4-20) ..........114
7-10-6 Energized/de-energized setting (RLY PTRN) ................................115
7-10-7 Alarm type setting (ALM TYPE)..........................................................................................118
7-10-8 Alarm pattern setting (ALM PTRN).....................................................................................120
7-10-9 Alarm value limiter setting (AL LIMIT) ................................................................................121
7-10-10 Fault pattern setting (FLT PTRN) .....................................................................................122
7-10-11 Flow automatic adjustment setting (AT FLOW) ................................................................123
7-10-12 Zero follower setting (ZERO)............................................................................................124
7-10-13 24-hour zero follower settings (ZERO 24F) .....................................................................125
7-10-14 Sensitivity correction settings (S ASSIST) .......................................................................127
7-10-15 External output in maintenance mode setting (MNT OUT) ..........128
7-10-16 External output adjustment (MA 4- 20) ........................................130
7-10-17 Backlight setting (BK LIGHT) ...........................................................................................131
7-10-18 ETHERNET settings (ETHERNET) ........................................................132
7-10-19 Pump drive level diagnostic settings (PUMP CK) ............................................................135
7-10-20 Setting for the behavior of fault contacts when flow is low (FLT RLY)
.................................................................................................................................136
7-10-21 External output during fault setting (FLT OUT) ............................137
7-10-22 Caution display setting (CAU DISP).................................................................................138
7-10-23 Caution output setting (CAU OUT)...................................................................................140
7-10-24 Displayed gas name setting (GAS NAME).......................................................................141
7-10-25 LCD contrast adjustment (CONTRAST) ..........................................................................143
8. Replacing and cleaning parts.................................................................................................................144
8-1 Replacing consumable parts ...........................................................................................................144
8-1-1 Replacing sensors................................................................................................................144
8-1-2 Dust filter replacement .........................................................................................................149
8-2 Replacing periodic replacement parts .............................................................................................150
8-2-1 List of recommended periodic replacement parts ................................................................150
8-2-2 Pump unit replacement ........................................................................................................150
8-2-3 Flow sensor unit replacement ..............................................................................................152
8-2-4 Fan unit replacement............................................................................................................155
8-3 Cleaning this product .......................................................................................................................157
9. Storage, Relocation, and Disposal.........................................................................................................158
9-1 Procedures for storage or when not used for extended periods .....................................................158
9-2 Relocation or reuse..........................................................................................................................159
9-3 Product disposal ..............................................................................................................................159
10. Troubleshooting .....................................................................................................................................160
10-1 Product abnormalities ....................................................................................................................160
10-2 Reading abnormalities ...................................................................................................................164
11. Product Specifications ...........................................................................................................................165
11-1 GD-84D-EX Specifications.............................................................................................................165
11-1-1 GD-84D-EX-EC ..................................................................................................................165
11-1-2 GD-84D-EX.........................................................................................................................167
11-1-3 GD-84D-EX-ET-EC.............................................................................................................169
11-1-4 GD-84D-EX-ET...................................................................................................................171
11-1-5 GD-84D-EX-EA-EC ............................................................................................................173
11-1-6 GD-84D-EX-EA...................................................................................................................175
4-20mA EA
4-20mA EA
4-20mA EA
4-20mA EA
ET EA
4-20mA
EA
4-20mA EA

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11-2 Sensor specifications .....................................................................................................................177
11-2-1 Electrochemical type ..........................................................................................................177
11-2-2 New ceramic type ...............................................................................................................178
11-2-3 Semiconductor type............................................................................................................179
11-2-4 Hot-wire semiconductor type ..............................................................................................181
12. Appendix ................................................................................................................................................183
12-1 Detection principle .........................................................................................................................183
12-1-1 Electrochemical type ..........................................................................................................183
12-1-2 New ceramic type...............................................................................................................185
12-1-3 Semiconductor type............................................................................................................187
12-1-4 Hot wire semiconductor type ..............................................................................................189
12-2 Terminology....................................................................................................................................191

1. Product Overview 1-1 Introduction
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1
Product Overview
1-1 Introduction
Thank you for purchasing this GD-84D-EX series Gas Detector ("product" hereinafter).
This operating manual describes product operating procedures and specifications. The manual provides
information essential to the correct use of the product.
Make sure you have read and fully understood the contents of this manual before using the product.
Keep this operating manual on hand to allow ready reference during use.
The contents of this manual are subject to change without notice to allow product improvements. Any
duplication or reproduction of this manual without permission is prohibited, whether in whole or in part.
Riken Keiki accepts no liability for accidents or damage resulting from use of the product, whether within or
outside the warranty period.
Review the warranty policy indicated on the warranty.
Before using the product, please confirm that the model of the product you purchased matches the model
of the product covered by this operating manual.
<Models covered by this operating manual>
GD-84D-EX-EC
GD-84D-EX
GD-84D-EX-ET-EC
GD-84D-EX-ET
GD-84D-EX-EA-EC
GD-84D-EX-EA
<This operating manual>
Where descriptions differ for different product models, this operating manual uses the following icons to
indicate each model:
GD-84D-EX-EC
GD-84D-EX 4 - 20 mA models
GD-84D-EX-ET-EC
GD-84D-EX-ET ET models
GD-84D-EX-EA-EC
GD-84D-EX-EA EA models
Operating procedures and specifications for which no icons appear apply to all models.
4-20mA
ET
EA

1. Product Overview 1-2 Product intended use and features
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1-2 Product intended use and features
This product is a fixed multi-gas detector head that detects leaks of various gases used in semiconductor
factories and similar locations.
It detects combustible gases and toxic gases in the surrounding atmosphere and activates alarms if preset
concentrations are exceeded.
Gas alarms are safety devices. They are not gas concentration meters nor gas analyzers designed to
analyze or measure gas quality or gas volumes.
Use the device correctly after confirming you understand the product’s features and characteristics.
1-2-1 Communication systems by model and corresponding sensors
This line of products features various models incorporating the following communication systems and
corresponding sensors.
Check the specifications before use to confirm the correct gases will be detected in accordance with the
intended purpose.
Model Communication
method
Corresponding
sensor
Power source Contact output
24 V DC PoE+ Alarm Fault
GD-84D-EX-EC 4 - 20 mA ESF ○○○
GD-84D-EX 4 - 20 mA NC F, SG F, S HF,
ESF ○○○
GD-84D-EX-ET-EC Ethernet ESF ○
GD-84D-EX-ET Ethernet NC F, SGF, S HF,
ESF ○
GD-84D-EX-EA-EC Ethernet
4 - 20 mA ESF ○* ○* ○○
GD-84D-EX-EA Ethernet
4 - 20 mA
NC F, SG F, S HF,
ESF ○* ○* ○○
* Do not use a 24 V DC power supply and PoE+ at the same time.
<Sensor models and detection principles>
Sensor model Detection principle
NCF New ceramic type
SGF Semiconductor type
SHF Hot-wire semiconductor
type
ESF Electrochemical type
1-2-2 Product features
This product incorporates gas sensors that detect leaking combustible and/or toxic gases or oxygen
deficiency.
The detected gas concentration is displayed on a full-dot LCD.
This product incorporates a pump to draw in gas and perform gas detection.
The product can be equipped with up to four sensors to detect up to four gas types.

1. Product Overview 1-3 DANGER, WARNING, and NOTE
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1-3 DANGER, WARNING, and NOTE
This operating manual uses the following categories to indicate potential damage/hazards if the user
disregards the information provided and uses the product incorrectly:
DANGER This indicates situations in which improper handling may result in fatal or
serious injury or significant property damage.
WARNING This indicates situations in which improper handling may result in serious
injury or significant property damage.
CAUTION This indicates situations in which improper handling may result in minor injury
or minor property damage.
Additionally, usage recommendations are indicated as follows:
NOTE
This indicates items that will be helpful to know when using the product.
1-4 Checking CE/UKCA marking
CE/UKCA marking compliant models will feature CE/UKCA marking labels. Check actual product
specifications before use.
Before using products with CE/UKCA marking, please refer to the “Declaration of Conformity” provided at
the end of this manual.
The CE/UKCA marking is found on the nameplate affixed to the rear of the front cover.
Location of CE/UKCA marking
(Rear of front cover)
CE/UKCA marking

2. Important Safety Information 2-1 Danger information
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2
Important Safety Information
2-1 Danger information
DANGER
The product is a non-explosion-proof device. Never attempt to use the product to detect gases
above the lower explosive limit (LEL).
2-2 Warning information
WARNING
Power source
Before turning on the power for the product, be sure to confirm that the power source meets the
specified voltage requirements. Avoid using unstable power sources; doing so may lead to
malfunctions.
Protective grounding required
Do not cut the protective grounding cable of the product or disconnect the protective grounding
terminal.
Defects of protective functions
Before operating the product, check the protective functions for defects.
Do not turn on the product if you suspect any problems with the protective grounding and other
protective functions.
External connections
Be sure to provide secure protective grounding before connecting the product to the detection target
or external control circuit.
Pipes
Avoid applying excessive pressure to the product’s sampling pipe openings.
This product is designed to perform gas detection by drawing in gas at atmospheric pressure.
Applying excessive pressure to the product’s sampling pipe openings (GAS IN, GAS OUT) is
dangerous. Doing so may cause the detection target gas to leak from the product.
Discharge exhaust gas after detection to a location confirmed to be safe by connecting an exhaust
pipe to the detection target gas outlet (GAS OUT) located on the bottom of the main unit.
Sensor handling
Never disassemble the sensor.
Electrochemical type sensors (ESF) contain electrolyte. Contact with electrolyte may result in skin
inflammation. Contact with eyes may result in blindness. Contact with clothing may result in
discoloration or damage to the fabric.
If contact occurs, rinse the area immediately with water.
Zero calibration in surrounding atmosphere (air calibration)
Check the atmosphere for freshness before performing zero calibration in the surrounding
atmosphere (air calibration for oxygen deficiency alarm models). Proper calibration is not possible in
the presence of interference gases. The presence of interference gases is also extremely
dangerous because the product may not detect actual gas leaks correctly.

2. Important Safety Information 2-3 Caution information
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Operating in an environment with gases
Do not operate this product in locations where combustible or explosive gases or vapor are present.
Operating this product in such environments is extremely hazardous.
Action when a gas alarm occurs
A gas alarm indicates the presence of extreme danger. The user must take appropriate action after
taking appropriate steps to ensure safety.
Depending on the type of gas detected, the sensor characteristics may be severely degraded. If the
gas alarm is triggered, we recommend performing maintenance on all sensors fitted to this product
to check their gas sensitivity.
2-3 Caution information
CAUTION
Do not use walkie-talkies near the product.
Radio waves from walkie-talkies or other radio transmitting devices near the product or cables may
affect readings. Use walkie-talkies or similar devices only in locations where they will not affect
product functions.
Wait at least five seconds after turning off the power before turning the power back on.
The product may not function correctly if the power is turned on again within five seconds.
Confirm that the flow display is the stipulated flow before using the product.
If the flow display is not the stipulated flow, gas will not be detected properly. Check whether the
flow is unstable or absent.
Attach a dust filter.
Attach the specified filters when using this product to avoid the effects of gas absorption and
airborne dust.
The correct dust filter type depends on the type of gas to be detected. Contact our sales department
for more information.
Observe the specified operating range to avoid condensation in the pipes.
Condensation within the pipes may lead to gas adsorption, blockages, and other problems that
make it impossible to detect gases accurately. To prevent condensation within the pipes, carefully
monitor temperature and humidity both at the sampling point and within the general environment.
When detecting gases that become more corrosive when dissolved in water (e.g., highly acidic
gases), note that consequences may include impaired capacity to detect gases and corrosive
damage to internal parts.
Do not use external output from the product to control other devices.
The product is not a control device. Never attempt to use the external output of the product to
control other devices.
Do not disassemble or modify the product or alter the settings unless absolutely necessary.
Product performance cannot be guaranteed if the product is disassembled or modified. Additionally,
altering the settings unnecessarily without a proper understanding of the details may prevent the
alarm from operating correctly.
Read this operating manual carefully to ensure correct use of the product.
Be sure to perform regular maintenance.
The product is a safety device. Maintain the product periodically to ensure safety. Continuing to use
the product without adequate maintenance will result in sensor sensitivity variations, preventing
accurate gas detection.

3. Product Configuration 3-1 Main unit and accessories
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3
Product Configuration
3-1 Main unit and accessories
Open the box and packaging and inspect the main unit and accessories.
If any accessories are missing, contact our sales department.
<ET models>
Main unit
Standard accessories
Protective rubber
caps*1
(2)
Dust filter*2
(1)
Operating
Manual
(1)
*1 These caps protect the GAS IN and GAS OUT ports. Remove them when the product is in use.
*2 One dust filter is supplied. The dust filter supplied depends on the model.
Optional accessories
Mounting plate for compatibility with GD-70D
(to use with four mounting screws)
Mounting plate for compatibility with GD-70D
(for use with three or four mounting screws)

3. Product Configuration 3-1 Main unit and accessories
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<4 - 20 mA models, EA models>
Main unit
Standard accessories
Protective
rubber
caps*1
(2)
Dust filter*2
(1) Terminal unit
Operating manual (1)
*1 These caps protect the GAS IN and GAS OUT ports. Remove them when the product is in use.
*2 One dust filter is supplied. The dust filter supplied depends on the model.
Optional accessories
Mounting plate for compatibility with GD-70D
(for use with four mounting screws)
Mounting plate for compatibility with GD-70D
(for use with three or four mounting screws)

3. Product Configuration 3-2 Part names and functions
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3-2 Part names and functions
3-2-1 Main unit part names and functions
<Front of main unit>
No. Name Function
①Fan This is the cooling fan.
GD-84D-EX-EC, GD-84D-EX-ET-EC, and GD-84D-EX-EA-EC lack
fans.
②Front panel The LCD display and keys used to operate the product are located on
this panel.
③LCD screen Full-dot LCD screen that displays gas concentration and other
information
④Front cover This cover protects the units inside the main unit.
②
④
①
③

3. Product Configuration 3-2 Part names and functions
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<Underside of main unit>
<4 - 20 mA models> <ET models> <EA models>
No. Name Function
①GAS IN This is the sampling pipe opening on the IN side.
②Power switch Power ON/OFF switch.
③Ethernet cable connection
inlet
RJ-45 connector for connecting Ethernet cable
④Grounding terminal Grounding wires are connected to this terminal.
⑤GAS OUT This is the sampling pipe opening on the OUT side.
①②④⑤①②④⑤
③①②④⑤③

3. Product Configuration 3-2 Part names and functions
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3-2-2 Front panel and LCD screen part names and functions
No. Name Function
①Power LED (POWER) This is the power LED. Lights up (green) when the power is ON.
②Alarm lamp (ALM1) This is the ALM1 (first alarm) alarm lamp. This lights up (red) when the
alarm setpoint for ALM1 (first alarm) is reached.
③Alarm lamp (ALM2) This is the ALM2 (second alarm) alarm lamp. This lights up (red) when
the alarm setpoint for ALM2 (second alarm) is reached.
④Fault lamp (FAULT) This is the Fault lamp. This lights up (yellow) when there is an
abnormality with the product.
⑤MODE key Hold down in detection mode to switch to user mode.
In user mode or maintenance mode, this key is used to cancel settings
and to return to the previous screen.
Hold down this key in user mode or maintenance mode to return to
detection mode.
⑥▲key Used to select sensors or adjust values (UP)
⑦▼key Used to select sensors or adjust values (DOWN)
⑧TEST/SET key Hold down in detection mode to switch to the mode used to perform
alarm tests.
This key is used in various modes to confirm values or make settings.
⑨SHIFT key This key is used for supplementary functions in various modes.
⑩Sensor positioning
indicators
These indicate the positions of the sensors.
Sensors [A1] and [A2] are fitted in flow passage A. Sensors [B1] and [B2]
are fitted in flow passage B. (Refer to ‘4-5-1 Configuration of the main
unit’.)
⑪Gas name displayed Displays the name of the detection target gas by chemical formula.
This can be changed to suit the fitted sensors. (Refer to
‘7-10-24 Displayed gas name setting (GAS NAME)’.)
⑫Concentration display Displays the gas concentration and other information.
⑬Concentration bar
display
The segmented detection range (full scale) displays gas concentrations
as bars. It indicates concentrations as ratios of the full scale.
①②③④
⑤
⑥
⑦
⑧
⑨
⑩⑪⑫⑬
⑭
⑮
⑯
⑰
⑱
GD-84D-EX

3. Product Configuration 3-2 Part names and functions
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⑭Second alarm setpoint
display
This indicates in points the second alarm setpoint as a ratio of the full
scale.
⑮First alarm setpoint
display
This indicates in points the first alarm setpoint as a ratio of the full scale.
⑯Units display Displays units matching sensor specifications (ppm, ppb, vol%, %, %LEL).
⑰Maintenance display
section
Setting details are displayed in user mode and maintenance mode.
Alarm contacts are disabled when [MAINTE] is displayed.
⑱Flow display Indicates the suction flow rate. The suction is 0.6 L/min (standard flow
rate) when the suction flow rate indicator bar is positioned in the middle.
* The screen display examples used in this operating manual show H
2
, NH
3
, and CH
4
as example detection target
gases.
<About the communication indicators>
Icons on the maintenance display section indicate whether the product is transmitting or receiving when
data is being transmitted or received to/from upstream devices.
NOTE
The suction flow rate for this product is automatically adjusted by the automatic flow adjuster
function. The flow rate is automatically adjusted even if the flow display varies from the stipulated
flow rate. No flow adjustment is normally required. Messages indicating [FLOW] (flow instability) or
[E-05] (flow abnormality) are displayed if pipe blockages, leaks, or other factors prevent automatic
adjustment. If this happens, identify the cause, then adjust manually until the flow reaches the
stipulated value. (Refer to ‘7-6-2 Manually adjusting the flow (FLOW)’.)
ET EA
Icons indicating the product
is transmitting or receiving

3. Product Configuration 3-3 Block diagram
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3-3 Block diagram
3-3-1 Electrical circuit diagram
Refer to the product electrical circuit diagram provided below.
<4 - 20 mA models>
Power supply section
Alarm contact control unit
・Gas alarm contacts
(Ch1 - 4 ALM1)
・Gas alarm contacts
(Ch1 - 4 ALM2)
・Fault alarm contact
(FAULT)
* Standard settings for
contact operation
Under normal conditions:
De-energized
At an alarm state:
Energized
・24 V DC
・4 - 20 mA
External output section
Control unit
CPU
Sensors (Ch1 - 4)
Display (LED)
Button panel
Pump Flow sensor
Pump control circuit
Power source voltage
conversion section
Display (LCD)
・POWER
・ALM1
・ALM2
・FAULT
・MODE
・TEST/SET
・▲
・▼
・SHIFT

3. Product Configuration 3-3 Block diagram
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<ET models>
Control unit
CPU
Sensors (Ch1 - 4)
Display (LED)
Button panel
Flow sensor
Pump
Transmitter
・Ethernet
Pump control circuit
Power source voltage
conversion section
Display (LCD)
・POWER
・ALM1
・ALM2
・FAULT
・MODE
・TEST/SET
・▲
・▼
・SHIFT
・PoE+
Power supply section

3. Product Configuration 3-3 Block diagram
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<EA models>
* Do not use a 24 V DC power supply and PoE+ at the same time.
Control unit
CPU
Sensors (Ch1 - 4)
Display (LED)
Button panel
Transmitter
・Ethernet
Pump control circuit
Power source voltage
conversion section
Display (LCD)
・POWER
・ALM1
・ALM2
・FAULT
・MODE
・TEST/SET
・▲
・▼
・SHIFT
Power supply section*
Alarm contact control unit
・24 V DC
・PoE+
・4 - 20 mA
External output section
・Gas alarm contacts
(Ch1 - 4 ALM1)
・Gas alarm contacts
(Ch1 - 4 ALM2)
・Fault alarm contact
(FAULT)
* Standard settings for
contact operation
Under normal conditions:
De-energized
At an alarm state:
Energized
Pump Flow sensor

3. Product Configuration 3-3 Block diagram
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3-3-2 Piping diagram
Refer to the product piping circuit diagram provided below.
Pump
Sensor Flow
Sensor
Flow automatic
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ustment
Flow monitor