RKI Instruments GD-70D User Manual

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Page 1

Gas Detector Head

GD-70D Series

Operating Manual

Request for the Customers

• Read and understand this operating manual before using the detector.

• You must operate the detector in accordance with the operating manual.

• Regardless of warranty period, we shall not make any compensation for accidents and damage caused by using this product. The compensation shall be made only under the warranty policy of products or parts replacement.

• Because this is a safety device, a regular maintenance for every six months and daily maintenance must be performed.

• If you find abnormalities in the detector, please notify them to our

local representative immediately.

RKI Instruments, Inc. 33248 Central Ave. Union City, CA 94587

Phone: 800-754-5165 Fax: 510-441-5650

Page 2

 Preface

Preface

Thank you for choosing our gas detector head GD-70D Series. Please verify that the model number of the product you purchased is included in the specifications on this manual.

This manual explains how to use the detector and its specifications. It contains information required for using the detector properly. Not only the first-time users but also the users who have already used the product must read and understand the operating manual to enhance the knowledge and experience before using the detector.

GD-70D - 2 -

Page 3



Preface .................................................................................................................... 2

Important Notices on Safety .................................................................................... 4

1 Overview ................................................................................................................. 6

1-1. Product Components............................................................................................... 6

1-2. Purpose of use ........................................................................................................ 6

1-3. Product Specifications ............................................................................................. 7

1-4. Names and functions for each part.......................................................................... 9

1-5. Units description...................................................................................................... 11

1-6. Block diagram.......................................................................................................... 14

2 Installation ............................................................................................................... 16

2-1. Requirements .......................................................................................................... 16

2-2. Installation of detector ............................................................................................. 19

2-3. How to wire.............................................................................................................. 23

2-4. Relocate .................................................................................................................. 29

2-5. Disposal................................................................................................................... 29

3 How to Operate ....................................................................................................... 30

3-1. Preparation for start-up............................................................................................ 30

3-2. How to start the detector ......................................................................................... 30

3-3. How to exit............................................................................................................... 32

3-4. Basic operating procedures..................................................................................... 32

3-5. Modes...................................................................................................................... 33

4 Detection Mode ....................................................................................................... 35

4-1. Gas alarm activation................................................................................................ 35

4-2. Fault alarm activation .............................................................................................. 37

4-3. External output operation ........................................................................................ 38

4-4. Other functions ........................................................................................................ 40

5 Alarm test Mode ...................................................................................................... 43

6 User Mode............................................................................................................... 44

7 Regular Maintenance Mode .................................................................................... 48

8 Maintenance............................................................................................................ 62

8-1. Maintenance intervals and items ............................................................................. 62

8-2. Gas calibration method............................................................................................ 64

8-3. Other adjustments/Cleaning method ....................................................................... 67

8-4. How to replace parts................................................................................................ 68

8-5. Procedures to store the detector or leave it for a long time ..................................... 70

9 Troubleshooting....................................................................................................... 71

Definition of Terms................................................................................................... 74

Detection principle ................................................................................................... 75

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Page 4

 Important Notices on Safety

Important Notices on Safety

DANGER

WARNING

CAUTION

NOTE

Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury or serious damage to the product. The use of this symbol is to be limited to the most extreme situation. Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury on the human body or object.

Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury or some damage on the human body or objects. It may also be used to alert against unsafe practices. This means "ADVICE" at operation.

DANGER

This is not an explosion-proof device. You must not use it to detect gases exceeding the lower limit of explosion.

WARNING

Power Supply

Before turning on the detector, always check whether the voltage is properly applied. Do not use an unstable power supply because it may cause malfunctions.

Need of grounding circuit

Do not cut the grounding circuit or disconnect the wire from the grounding terminal.

Defects in protective functions

Before starting the detector, check the protective functions for defects. When seeming defects are found in the protective functions, such as protective grounding, do not start the detector.

External connection

Before connecting the detector to external equipments or external control circuit, securely connect it to a protective grounding circuit.

Tubing

The detector is designed to suck gases around it under the atmospheric pressure. If excessive pressure is applied to the sampling inlet and outlet (GAS IN, GAS OUT) of the detector, detected gases which may be leaked from its inside pose dangers. Be sure that excessive pressure is not applied to the detector when it is used. Detected gases must be exhausted from the detected gas exhausting outlet (GAS OUT) on the bottom of the detector to which an exhaust tube is connected, to a point regarded as a safe place.

Handling the sensor unit

Do not disassemble the electrochemical type sensor unit (ESU) or galvanic cell type sensor unit (OSU) because they contain electrolyte. Electrolyte may cause severe skin burns if it contacts skin, while it may cause blindness if its contacts eyes. If electrolyte is adhered on you clothes, that part on your clothes is discolored or its material is decomposed. If contact occurs, rinse the area immediately with a large quantity of water.

Zero adjustment (AIR Adjustment) in the atmosphere

When zero adjustment (AIR Adjustment for oxygen deficiency alarm) is performed in the atmosphere, check the atmosphere for freshness before beginning the adjustment. If other gases exist, the adjustment cannot be performed properly, thus leading to dangers when the gas leaks.

Operation in a gas

Do not operate the detector in a place where flammable/explosive gases or vapors are present. Operating the detector in such an environment will lead to extreme dangers.

Response to a gas alarm

Issuance of a gas alarm indicates that there are extreme dangers. Take proper actions based on your judgment.

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 Important Notices on Safety

CAUTION

Do not use a transceiver (walkie-talkie) near the detector.

Radio wave from a transceiver near the detector or its cables may disturb commands. when using a transceiver, it must be used in a place where it disturbs nothing.

To restart the detector, you must wait five seconds more before doing it.

Restarting the detector within five seconds may cause errors.

Verify that the reading on the flow rate indicator corresponds to the specified flow rate before using the detector.

If it does not correspond to the specified flow rate, gas detection cannot be performed properly. Check whether the flow rate is unstable or lost.

Attach the dust filter before using the detector.

Before using the detector, attach the specified filter to prevent disturbances by possible gas adsorption or air dust. A dust filter to be used is varies depending on the gas to be detected. For more information on dust filters, please contact our sales department.

Observe the operating restrictions to prevent condensation inside the tube.

Condensation formed inside the tube causes clogging or gas adsorption, which disturb accurate gas detection. Thus, condensation must be avoided. In addition to the installation environment, carefully monitor the temperature/humidity of the sampling point to prevent condensation inside the tube. In particular, when detecting a gas which is solved into water and corrodes contacted materials, such as a strong acid gas, the gas is undetectable and furthermore may corrode internal parts. Please observe the operating restrictions.

Do not use the external output of the detector to control other devices.

This is not a control device. You are not allowed to use its external output to control other devices.

Do not disassemble/modify the detector, or change the settings if not necessary.

Disassembling/Modifying the detector will invalidate the guarantee of the performance. Changing the settings without understanding the specifications may cause alarm malfunctions. Please use the detector properly in accordance with the operating manual.

Do not forget to perform a regular maintenance.

Since this is a safety device, a regular maintenance must be performed to ensure its safety. Continuing to use the detector without performing a maintenance will compromise the sensitivity of the sensor, thus resulting in inaccurate gas detection.

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1 Overview 1-1. Product components

Overview

1-1. Product components

• Operating manual

• Protective rubber cap (to be removed when using the

detector)

• Dedicated handling lever (for wiring)

• Dust filter

• Interference gas removal filter (to be supplied with some

sensor units)

* This is needed in "pyrolyzer + electrochemical type (ESU)" and "pyrolyzer + pyrolysis-particle type (SSU)". For more information on the pyrolyzer unit (PLU-70), see the individual operating manual.

Pyrolyzer unit

1-2. Purpose of use

• This is a fixed type gas detector head which detects leak of gases used in semiconductor factories, etc.

• The gas detector is a safety device, not an analyzer or densitometer which performs quantitative/qualitative

analysis/measurement for gases. You must understand the features of the detector before using it, so that you can use it properly.

• The detector detects abnormalities in the air caused by presence of gases or other reasons (leak and oxygen deficiency) with the built-in gas sensor unit. The concentrations of detected gases are shown on the Character LCD.

• The built-in pump in the detector sucks gas to perform gas detection.

• The detector has two-step gas alarm contact and fault alarm contact.

• The detector outputs gas concentration in 4 - 20 mA or digital data.

GD-70D Analog Transmission (4-20 mA specification) GD-70D-NT 2-wire type DC power-line communication (NT specification)

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1 Overview 1-3. Product specifications

1-3. Product specifications

Concentration Display Suction Flow Rate

Power Display POWER lamp on (green) Displays Gas name display/Flow rate indicator/Mode display/Communication status

Gas Alarm Display First: ALM1 lamp on (Red)/Second: ALM2 lamp on (Red) Gas Alarm Activation Gas Alarm Contact No-voltage contact 1a or 1b (2 step independent)

Fault Alarm/Self Diagnosis

Fault Alarm Display Fault Alarm Activation Fault Alarm Contact

Contact Capacity 125 VAC - 0.25A/24 VDC - 0.5A (Resistant load) Recommended Contact Cable Functions White backlight/Alarm delay/Suppression/Zero follower/Sensitivity correction/

Tube Connecting Hole Initial Clear Approx. 25 seconds Structure Box type/Wall mounted type External Dimensions Weight Approx. 0.9 kg Outer Color Gas detector: grey

Character LCD (Digital and Bar Meter Display)

0.5L/min ±10%

display/Pyrolyzer connection display

Auto-reset

de-energized (energized at a time of alarm) or energized (de-energized at a time of alarm)

System abnormalities/Sensor abnormalities/Flow Rate abnormalities/Communication abnormalities/Pyrolyzer abnormalities

FAULT lamp on (Yellow)/Detail display

Auto-reset

No-voltage contact 1a or 1b de-energized (energized at a time of alarm) or energized (de-energized at a time of alarm)

Cable of CVV, etc. (1.25sq) - max. 6-core

Flow control/Calibration history/Alarm trend history/Event history Rc1/4 (O.D Φ6-1t half-union for Teflon tube<PP>supplied)

Approx. 70(W)x120(H)x145(D) mm (projection potions excluded)

Front door: white

Model GD-70D GD-70D-NT Transmission System

Transmission Specification

Recommended Transmission Cable Recommended Power Cable

Power Supply

3-wire type analog transmission (Common Power Supply <Power, Signal, Common>) or 2-wire type analog transmission 4 - 20 mA DC (no-insulation/load resistance under 300Ω)

Shielded cable of CVVS, etc. (1.25sq) 3-core or 2-core

Cable of CVV, etc.(1.25sq) - 2-core (Those for 3-wire type are common with the transmission cable.)

24VDC ±10% 24VDC ±10%

- 7 - GD-70D

2-wire type DC power-line communication

DC power-line communication system Shielded twisted-pair cable (1.25sq) of KPEV-S, etc. - 1P

(Common with the transmission cable)

(Dedicated line by blocking filter)

Page 8

1 Overview 1-3. Product specifications

Detection principle Gas to be detected Detection range

Detection system Alarm setpoint

Alarm accuracy

Alarm delay time

Alarm type two-step alarm

Power consumption Operating temperatures (without sudden change) Operating humidity (without condensation)

*1 Pyrolyzer unit combination specification. For information on the specifications

*2 Oxygen deficiency specification. For information on other specifications (oxygen leak

*3 The operating temperatures/humidity may be different depending on the gas to be

*4 To the alarm setpoint *5 By providing the gas 1.6 times the alarm setpoint (excluding delay in the tube and in the

*6 By letting the detector detect the gas of 10 - 11 vol% (excluding delay in the tube and in

ESU

Electrochemical

type

Toxic gas *3 NF3 TEOS Flammable gas

Depending on the gas to be detected

Pump suction

type Depending on the gas to be detected

30-70%RH 30-80%RH Below 95%RH

of the pyrolyzer unit (PLU-70), see the individual operating manual.

specifications), please contact us.

detected.

communication)

the communication). Within 30 seconds for 90% response

ESU+PLU

Electrochemical

type

0-30ppm 0-15ppm Depending on

Pump suction type/pyrolysis

type

10ppm(1st)

20ppm(2nd)

Within ±30% *4

60 seconds or less *5

(H-HH)

Approx. 1.5 W

(Max. 4 W)

SSU+PLU

Pyrolysis-

particle type

10ppm(1st)

10ppm(2nd)

0-40°C

SGU OSU

Semiconductor

type

Toxic gas

the gas to be detected

Pump suction type

Depending on the gas to be detected Flammable: within ±25% Toxic: within ±30% *4 Flammable: 30 seconds or less Toxic: 60 seconds or less *5

Approx. 2.5 W

(Max. 5 W)

Galvanic cell

18vol%(1st)

18vol%(2nd)

Within ±1 vol%

<accuracy of the

Within ±0.7 vol%

5 seconds or less

two-step alarm

Approx. 1.5 W

type

Oxygen

0-25vol%

reading>

(L-LL,L-H)

(Max. 4 W)

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1 Overview 1-4. Names and functions for each part

1-4. Names and functions for each part

M5 mounting hole

GAS OUT

GAS IN

Protective cover for power switch

Screw for grounding earth rod

External wire hole

Connector for PLU

Connector for PoE

Display

Operating

switch

Sensor unit

displa

Power switch

(Unit: mm)

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1 Overview 1-4. Names and functions for each part

c MODE key d TEST/SET key e ▲key f ▼key

⑭Concentration bar indicator ⑮Alarm setpoint indicator

⑫Concentration

value displa

⑰Communication indicator

⑯Flow rate indicator

hSensor unit nameplate display window

gLock lever

①

②

③ ④ ⑤ ⑥

⑦ ⑧

⑨

⑩ ⑪ ⑫

⑬ ⑭

⑮

⑯

⑰

⑱

⑲ ⑳

MODE key

TEST/SET key

▲ key ▼ key

Lock lever Sensor unit nameplate display window Power lamp (POWER) First alarm lamp (ALM1) Second alarm lamp (ALM2) Fault lamp (FAULT) Gas name display Concentration value display Unit display Concentration bar indicator Alarm setpoint indicator Flow rate indicator

Communication indicator Maintenance indicator

Inhibit indicator Pyrolyzer unit connection indicator

Used to enter the maintenance mode. It is also used to cancel or skip in a specific mode. Used to enter the test mode. It is used for value confirmation and so on in a specific mode. Used to switch screen or change a value (UP). Used to switch screen or change a value (DOWN). Lever to lock the main unit. Push it to attach or detach the main unit. Window to look at the nameplate of the sensor unit. You can identify the currently attached sensor unit. Power lamp. It lights in green when the power is on. First alarm lamp. It lights in red when the first alarm is reached.

Second alarm lamp. It lights in red when the second alarm is reached.

Fault lamp. It lights in yellow when an abnormality is detected in the detector. Displays the gas name in chemical formula and so on (e.g. Silane = SIH4). Displays the gas concentration and so on.

Displays the unit according to the specification (ppm, ppb, vol%, %, %LEL). The detectable range (full scale = FS) is divided into 20 with bars. The increase in concentration is displayed in proportion to the full scale. The alarm setpoints (AL1 and AL2) are indicated on the concentration bar.

Displays the suction flow rate. The center of the bars means the normal suction flow rate of 0.5 L/min. For GD-70D-NT, this indicator is displayed while transmitting data with the upper unit (TX, RX). Displayed during the maintenance mode. When this indicator is displayed, the alarm contact is disconnected to be disabled. Displayed when the inhibition (point skip) is set. Displayed when the dedicated pyrolyzer unit (PLU-70) is connected.

jFirst alarm lamp

iPower lamp

⑱Maintenance indicator

kSecond alarm lamp

lFault lamp

⑳Pyrolyzer unit connection indicator

⑬Unit display

⑪Gas name display

⑲Inhibit indicator

GD-70D - 10 -

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1 Overview 1-5. Units description

1-5. Units description

The detector consists of the following units.

 CAUTION

• Each unit consists of precision parts. When a unit is detached, be careful not to drop it. Dropping the unit compromises its original performance or causes malfunctions.

Wall-mounted unit Main unit

Pump unit

Sensor unit

1. Push the two buttons at the top of the main unit together to

open the front cover. (Pushing only either one button cannot open the cover, but then pushing the other can open it.) * The front cover opens about 90 degrees at first. You can push it down to 180 degrees.

 CAUTION

• Turn the power off before detaching or attaching the sensor unit.

2. Hold the convexed parts on both sides of the sensor unit and

pull it out. If the sensor unit is hard to detach, insert a finger into the gap at the top right of the sensor unit and pull it out.

3. When attaching the sensor unit to the main unit, thrust it onto

the main unit and make sure that the sensor unit is securely fixed, otherwise it might come off.

4. After replacing the sensor unit, close the front cover. Be sure

to check the click of the front cover to fix it properly, otherwise it might open again.

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1 Overview 1-5. Units description

A sensor unit installed in the detector is the same regardless of the detection principle, thus sensor units are interchangeable. Each sensor unit has a different color in accordance with the principle as shown below. How to handle the sensor unit is varies depending on its principle.

 CAUTION

• The sensor unit must be handled carefully to ensure quality as safety device. When the sensor unit is stored, a dedicated warehouse and power equipment for the sensor unit are needed. In principal, the sensor unit must not be detached from the detector when it is handled or stored. We will take care of your sensor unit.

• Be sure that the sensor unit is not installed improperly. If a sensor unit of different specification or principle from the one shipped from the manufacturer, a message will be displayed on the LCD of the detector (C-02). If the message is displayed, check the specifications of the sensor unit.

• After the sensor unit is replaced, always perform a gas calibration (zero adjustment and span adjustment).

Electrochemical

type (ESU)

Pyrolysis-particle

type (SSU)

• Do not disassemble the sensor unit because it contains electrolyte. If contact occurs, rinse the area immediately with a large quantity of water.

• The sensor unit identifies the direction. Put the sensor unit in the dedicated case while handling it. Do not place it on its side or upside-down.

• When a new sensor unit is installed, it must be warmed up. Although warm-up time is different depending on the type of the installed sensor, it is recommended that warm-up should be performed for three hours or more. Please contact our sales department for more information.

• The sensor unit must be stored in a clean, cool and dark place away from direct sunlight. Some types of the sensor units cannot be stored together with other units. Please contact our sales department for more information.

Dedicated case

• Although the sensor unit contains radioactive materials, it is certified as a specified designing certification device, which is regarded as a device having no influences on health. Observe the "Safety Manual" which stipulates conditions for the certification. To dispose of the sensor unit, you must return it to us. You do not need to take any additional actions.

• The sensor unit contains a small amount of radioactive materials. Do not disassemble it, or dispose of it like other wastes.

• The sensor unit must be put into the dedicated case specified by us, and stored away from direct sunlight in a clean place where the temperature and humidity are maintained at a normal level and where appropriate measures are introduced to prevent it from being taken out easily.

• When the sensor unit is transported out of your

Dedicated case

factory, please use a transportation company which can handle specified designing certification devices (L-type packages).

• For more information, see the "Safety Manual".

GD-70D - 12 -

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1 Overview 1-5. Units description

Semiconductor

type (SGU)

Galvanic cell type

(OSU)

• Before using the sensor unit, it needs to be warmed up for a specified time. The sensor unit is warmed up sufficiently in our factory before it is delivered to you. Therefore, after you receive the sensor unit, please use it as soon as possible so that unpowered time is minimized.

• The warm-up (powered) time before using the sensor unit is related to the unpowered time.

Unpowered time

10 minutes or less 10 minutes or more 2 hours or more 1 hour or less 30 minutes or more 2 hours or more 24 hours or less 1 hour or more 4 hours or more 72 hours or less 4 hours or more 24 hours or more 10 days or less 2 days or more 2 days or more Less than 1 month 7 days or more 7 days or more Less than 3 months 14 days or more 14 days or more 3 months or more 1 month or more 1 month or more

• To store the sensor unit under unpowered state, it must be stored under normal temperature/humidity in a clean place away from direct sunlight.

• Do not disassemble the sensor unit because it contains electrolyte. If contact occurs, rinse the area immediately with a large quantity of water.

• The sensor unit must be stored under normal temperature/humidity in a clean place away from direct sunlight.

Suggested powered time SGU-8541 (H2) SGU (Others)

After detaching the sensor unit, push down to open the pump stopper. Pinch the part labeled "PULL" at the top of the pump unit, and pull it out.

When attaching the pump unit to the main unit, position the grooves of the pump unit at the rails of the main unit and push the pump unit. Do not push the center diaphragm. Push the part labeled "PULL". And as the connecting point (flow path) of the pump unit is greased, be sure to check for any dust.

"PULL"

Do not push here.

groove rail

connection

(flow path)

- 13 - GD-70D

Page 14

1 Overview 1-6. Block diagram

(

)

<Wall-mounted Unit>

Mounting hole: A hole for wall-mount.

Terminal plate: A terminal to which a power supply, signal cables and other external wires are connected

Lock lever: A lever to lock the main unit.

10P

1-6. Block diagram

Sensor unit

Amplifier

Power supply

POWER

Alarm contact controller

Gas alarm contact (ALM1,

LM2)

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)

4-20 mA specification: 4-20 mA DC Transmission NT specification: digital data transmission

Transmitter

Controller

(CPU)

Controller

(CPU)

Display

(POWER)(ALM1)(ALM2)(FAULT)

LCD

Operating unit

(MODE)(▲)(▼)(TEST/SET)

Pump

control

circuit

Pump

Flow

sensor

GD-70D - 14 -

Page 15

1 Overview 1-6. Block diagram

- 15 - GD-70D

Page 16

2 Installation 2-1. Requirements

Installation

2-1. Requirements

Not only the first-time users but also the users who have already used the product must follow the operating precautions. Ignoring the precautions may damage the detector, resulting in inaccurate gas detection.

 CAUTION

• After you received the detector, start using the detector within the specified operation start limit of the sensor unit.

 CAUTION

• This is a precision instrument. Because the detector may not provide the specified performance in some places (environments), check the environment in the installation site, and then take appropriate actions if necessary.

• Because the detector plays an important role for safety and disaster prevention, you must install as many units of the detector as needed in appropriate points.

• Because points where gases leak and remain easily are different depending on the types of gases and the working areas, please decide carefully installation sites and the number of units to be installed.

Do not install the detector in a place with vibrations or shocks.

The detector consists of sensitive electronic parts. The detector must be installed in a stable place without vibrations or shocks and it cannot drop.

Do not install the detector in a place exposed to water, oil or chemicals.

When you select installation sites, avoid a place where the detector is exposed to water, oil or chemicals.

Do not install the detector in a place where the temperature drops below 0ºC or rises over 40ºC.

The operating temperatures of the detector are 0 - 40ºC. The detector must be installed in a stable place where the operating temperatures are maintained and do not change suddenly.

GD-70D - 16 -

Page 17

2 Installation 2-1. Requirements

Do not install the detector in a place exposed to direct sunlight or sudden changes in the temperature.

When you select installation sites, avoid a place where it is exposed to direct sunlight or radiant heat (infrared rays emitted from a high-temperature object), and where the temperature changes suddenly. Condensation may be formed inside the detector, or the detector cannot adjust to sudden changes in the temperature.

Keep the detector (and its cables) away from noise source devices.

When you select installation points, avoid a place where high-frequency/high-voltage exist.

Do not install the detector in a place where maintenance of the detector cannot be performed or where handling the detector involves dangers.

Regular maintenance of the detector must be performed. Do not install the detector in a place where the equipment must be stopped when maintenance is performed in its inside, where parts of the equipment must be removed to perform maintenance, or where the detector cannot be removed because tubes or racks prevent access to it. Do not install the detector in a place where maintenance involves dangers, for example, near a high-voltage cable.

Do not install the detector in equipment which is not properly grounded.

Before installing the detector in equipment, the equipment must be grounded properly.

Do not install the detector in a place where other gases exist around it.

The detector must not be installed in a place where other gases exist around it.

 CAUTION

• An unstable power supply and noise may cause malfunctions or false alarms.

• The descriptions in this section must be reflected on the designing of a system using the detector.

Using a stable power supply

The external output and alarm contact of the detector may be activated when the power is turned on, when momentary blackout occurs, or when the system is being stabilized. In such cases, use a safety power supply, or take appropriate actions on the receiving side. The detector must be provided with the following power supply.

Power supply voltage

Allowed time of momentary blackout

Others

24 VDC Up to 10 millisecond (To recover from the momentary blackout for 10 millisecond or more, restart the detector.) Do not use it with a power supply of large power load or high-frequency noise.

±10% (the terminal voltage of the detector)

Example of actions

To ensure continuous operation and activation, install a protective power supply outside the detector.

Example of actions

Use a line filter to avoid the noise source if necessary.

Heat radiation designing

When it is installed in the closed instrumentation board, attach ventilation fans above and below the board.

- 17 - GD-70D

Page 18

2 Installation 2-1. Requirements

Introducing protective measures against lightning

If cables are installed outside the factory/plant, or if internal cables are installed in the same duct as the cables coming from outside the factory/plant, "lightning" will cause problems. Because lightning acts as a large emission source while cables act as a receiving antenna, devices connected to the cables may be damaged. Lightning cannot be prevented. Cables installed in a metal conduit or under the ground cannot be completely protected from inductive lightning surge caused by lightning. Although complete elimination of disasters caused by lightning is impossible, the following protective measures can be taken.

Protection against lightning

Grounding In addition to lightning, there are more sources of surge noise. To protect devices from

* The lightning arrester has a circuit to remove a surge voltage which damages field devices, so that

signals may be attenuated. Before installing a lightning arrester, verify that it works properly.

Take appropriate measures in accordance with the importance of the facilities and the environment.

• Connect the transmission signal route by using optical fiber.

• Provide protection by a lightning arrester (cable safety retainer).

(Although inductive lightning surge can be transmitted through the cable, it is prevented by installing a lightning arrester before the field devices and central processing equipment. For information on how to use a lightning arrester, please contact the manufacturer.)

these noise sources, the devices must be grounded.

Proper use of alarm contact

The alarm contact of the detector is used to transmit signals to activate an external buzzer, alarm lamp or rotating lamp. Do not use the detector for controlling purpose (e.g., controlling the shutdown valve).

 CAUTION

• The b contact (break contact) under de-energized state may be opened momentarily by a physical shock, such as external force.

• When the b contact is selected for the alarm contact, take appropriate actions to prepare for a momentary activation, for example, add signal delay operation (approximately one second) to the receiving side of the b contact.

The specifications for the alarm contact of the detector are based on the resistant load conditions. If inductive load is used at the alarm contact, the following errors will occur easily because counter electromotive force is generated at the contact.

• Deposition, defective insulation or defective contact at the relay contact

• Damage of any electric parts due to high-voltage generated inside the detector

• Abnormal operations by an out-of-control CPU

 CAUTION

• In principal, do not activate inductive load at the alarm contact of the detector. (In particular, never use the inductive load to activate a fluorescent lamp or motor.)

• If inductive load is activated, relay it with an external relay (contact amplification). However, because the coil of an external relay also involves inductive load, select a relay at a lower voltage (100 VAC or below), and then protect the contact of the detector with an appropriate surge absorbing part, such as

If load is to be activated, appropriate measures must be taken to stabilize the operation of the detector and protect the alarm contact referring to the following information.

• Relay it with an external relay at a lower voltage of 100 VAC or below (contact amplification). At the same time, the surge absorbing part SK1 suitable for the specifications must be attached to the external relay.

• In addition, the surge absorbing part SK2 must be attached to the loaded side of the external relay if necessary.

• It may be recommended that the surge absorbing part should be attached to the contact for certain load conditions. It must be attached to an appropriate position by checking how the load is activated.

GD-70D - 18 -

Page 19

2 Installation 2-2. Installation of detector

GD-70D

SK1

Coil

SK2

Load

Power supply

Alarm contact

External relay

(low voltage relay)

* SK1, SK2: Surge absorbing parts

2-2. Installation of detector

NOTE

To use the pyrolyzer unit (PLU-70), also refer to the individual operating manual.

 CAUTION

• Before installing the detector, remove the protective rubber caps from GAS IN and GAS OUT. If the detector turned on with the rubber caps remaining while the installation, applied overload may damage the pump and sensor. Do not forget to remove the caps.

- 19 - GD-70D

Page 20

2 Installation 2-2. Installation of detector

(90)

When installing by using 2 screws When installing by using 3 screws

 CAUTION

• It is recommended that installation points should be away from each other for 10 mm or more. Intervals between installation points must be at least 5 mm.

• When you install more than one unit of the detector in a line, install them in a rack or wall that are not influenced by vibrations. When the detectors are installed side-by-side, if the rack or wall in which the detectors are installed do not have enough strength, vibrations from the pumps inside the detectors cause resonance between them. In this case, take preventive actions, for example, reinforcing the rack or wall.

Leave the diagonal line area so that the installation space is reserved.

(300)

(30)

(150)

(Unit: mm)

Maintenance space Maintenance space Maintenance space Maintenance space Maintenance spaceMaintenance space

GD-70D - 20 -

Page 21

2 Installation 2-2. Installation of detector

 CAUTION

• The detector must be installed in the right direction to ensure its performance. Install the detector as shown on the following example, and adjust its position so that it is placed horizontally. (* The direction of the detector must also be kept during transportation, including when it is removed temporarily or relocated.)

Wall

Ceiling

Wall

Floor

Attach the wall-mounted unit in the installation surface using two or three M5 screws.

Recommended mounting screw (M5) Length of 8 mm or more Flat washer of φ10 mm or less (small round)

After the wall-mounted unit is attached to the wall, install the main unit in the wall-mounted unit.

 CAUTION

• Install the unit so that its surface is in intimate contact with the wall-mounted unit. A space between the unit and the wall-mounted unit invites unnecessary vibrations and noises.

- 21 - GD-70D

Page 22

2 Installation 2-2. Installation of detector

Attaching Main Unit

At the position of 10 mm above the wall hanger unit, press the main unit onto the wall hanger unit. Be sure to fit both side hooks of the wall hanger unit in the grooves of the main unit. Then press down the main unit to fix it. The lock at the bottom of the main unit clicks to fix it properly. Make sure that the top center of the wall hanger unit is above the main unit as viewed from front.

Detaching Main Unit

While pushing the sky blue lever toward the wall hanger unit, hold up the main unit. If you cannot move the main unit, insert a larger flathead screwdriver while pushing the lever, and you can easily detach it as shown below. Do not rotate or move up and down the flathead screwdriver. Simply insert it into the wall hanger unit.

 CAUTION

• Be careful not to drop the main unit when detaching it. Also, check the secure installation of the main unit after attaching it to the wall hanger unit. If the main unit is not securely installed, it might fall, causing an unexpected injury or a damage of the unit.

• Turn the power off before detaching or attaching the main unit.

When pressing the main unit, align the side mark with the hoo of the wall hanger unit for smooth installation.

Make sure that the top of the wall hanger unit is above the main unit.

The lock clicks.

10mm

GD-70D - 22 -

Page 23

2 Installation 2-3. How to wire

2-3. How to wire

NOTE

To use the pyrolyzer unit (PLU-70), also refer to the individual operating manual.

 CAUTION

• Be careful not to damage the internal electronic circuit when wiring. In addition, be careful not to apply stresses on the detector when (overweight) cables are installed.

• The power cables and signal cables must not be installed together with the motor power cables, etc. When these cables must be installed together for unavoidable reasons, put the power cables and signal cables in a metal conduit. The conduit must be connected to a grounding circuit.

• When stranded wires are used, prevent wires from contacting each other.

• Use the dedicated handling lever to wire.

For 3-wire type 4 - 20 mA (common power supply) For 4-wire type 4 - 20 mA Power: Cable of CVV, etc. (1.25sq) - 2-core

For 2-wire type DC power-line communication system (NT) For contact Cable of CVV, etc. (1.25sq) - max. 6-core

Shielded cable of CVVS, etc. (1.25sq) - 3-core

Signal: Shielded cable of CVVS, etc. (1.25sq) - 2-core Shielded twisted-pair cable of KPEV-S, etc. (1.25sq) - 1P

1 2 3 4 5 6 7 8 9 10

+ - + -

24VDC 4-20mA ALM1 contact ALM2 contact FAULT contact

NOTE

For the 3-wire type (4 - 20 mA), the terminal 2 is used for common, and the terminals 2(-) and 3(+) are used to output 4 - 20 mA.

For the NT specification, the terminals 3 and 4 are not used.

Specifications of terminal plate

• Rated voltage: 250 VDC

• Rated current: 16 A

Top handling slot

Cage clamp/spring

Driver slot

Conductive part

Wiring hole

- 23 - GD-70D

Page 24

2 Installation 2-3. How to wire

Connection conditions

• Cable: 0.08 - 2.5mm2

• Bare wire length: 8 - 9 mm

• Connecting tool: Dedicated handling lever (accessory)

 CAUTION

• The specified bare wire length must be observed when the wire insulation is peeled off.

• Improper clamping of the wire due to a shorter bare wire length may cause defective electrification or

heating.

• Damaging the wire insulation due to a shorter bare wire length may cause defective electrification or heating.

• Exposing the wire due to a longer bare wire length may cause defective insulation or a short circuit.

• Be careful not to break up the wire. If the wire is broken up when inserted to the terminal, this may

cause defective insulation or heating.

8 – 9 mm

Dedicated

handling lever

Compatible bar terminal

For a bar terminal, the following items are available.

• Bar terminal (ferrule): Model 216 Series (manufactured by WAGO)

• Crimping tool: Model VarioCrimp 4 (206-204) (manufactured by WAGO)

 CAUTION

• A bar terminal of the specified model must be used. Using other bar terminals invalidates the guarantee of the performance.

GD-70D - 24 -

Page 25

2 Installation 2-3. How to wire

When cables are connected to the connectors, use the dedicated lever or a flathead screwdriver to do it as shown below.

 CAUTION

• The right tools must be used.

• In principal, one wire can be connected to one wiring

hole.

• When the wire is inserted into the driver slot by mistake, it does not contact the conductive part. This may cause defective electrification or heating.

• When the wire is inserted under the spring by mistake, it does not contact the conductive part. This may cause defective electrification or heatin

NOTE

How to Use the Dedicated Handling Lever

Push the lever with your finger to lower the spring in its inside.

While holding down the lever, insert the wire into the (round) wiring hole until it reaches the deepest point. Once the lever is released, the wire is secured.

To check whether the wire is connected securely, pull the wire gently. (Do not pull the wire strongly.)

Insert the supplied fastening-band to the hole on the wall-mounted unit as shown in the figure. Position the band so that its coarse side faces the wire. After inserting the fastening-band, fix the wire together.

NOTE

When an optional cable ground is used, it must be attached to the external wiring hole.

Push the dedicated handling lever to open the terminals, into which you can insert wires (one wire to one terminal).

Position the band so that its coarse side faces the wire.

- 25 - GD-70D

Page 26

2 Installation 2-3. How to wire

Grounding

Use the grounding terminal to connect the detector to your grounding circuit.

 WARNING

• Before turning on the detector, do not forget to connect it to a grounding

• For stable operation of the detector and safety , it must be connected to a grounding circuit. Do not connect the grounding wire to a gas pipe. The grounding must be made as D type grounding (below 100 Ω of grounding resistance).

circuit.

Grounding screw (M4)

Bottom

GD-70D - 26 -

Page 27

2 Installation 2-3. How to wire

Wiring Example Connecting to the indicator (3-wire type - 4 - 20 mA specification)

RM-593, etc.

+24V

Power

supply

+24V

GND

SIG

Connecting to the upper unit (DCS, PLC) (4-wire type - 4 - 20 mA specification)

Power supply

(24 VDC)

Upper unit

(DCS, PLC)

GD-70D

123456 7 8 9 10

GD-70D

123456 7 8 910

Connecting to the multi-display unit (RM-70NT) (NT specification)

Power supply

(24 VDC)

Upper unit (RM-70NT)

DC24V(+)

DC24V(-)

Blocking filter

(B/F) (B/F)

+ -

- 27 - GD-70D

GD-70D-NT

12345 6 7 8 910

Page 28

2 Installation 2-3. How to wire

NOTE

To use the pyrolyzer unit (PLU-70), also refer to the individual operating manual.

The detector has a Rc1/4 thread inside of the sampling inlet/outlet (GAS IN, GAS OUT), to which "polypropylene" unions are normally attached. Because their material is varies depending on the gas to be used, please specify the gas. The compatible tube is a Teflon tube of φ6 (OD) - φ4 (ID). The tube must be installed with the supplied inners and sleeves attached to prevent a leak. When the tube is cut, its cut point has a smaller inner diameter. Use an abrasive material to expand the cut point to the inner diameter. To remove cut-dust remaining inside of the tube, blow compressed air into the tube before connecting it to the detector. Some sample gases have highly adsorptive or corrosive features. Select the tube material taking into account of these precautions. The suction flow rate of the detector itself is approximately 0.5 L/min under the operating temperatures. When a gas is sucked from a distant point, please consult us on the tube length.

union

inner

sleeve

tube

 WARNING

• The detector is designed to suck gases around it under the atmospheric pressure. If excessive pressure is applied to the sampling inlet and outlet (GAS IN, GAS OUT) of the detector, detected gases may be leaked from its inside, thus leading to dangers. Be sure that excessive pressure is not applied to the detector while used.

• Detected gases must be exhausted from the detected gas exhausting outlet (GAS OUT) on the bottom of the detector to which an exhaust tube is connected, to a point regarded as a safe place.

 CAUTION

• The longer the tube of the GAS IN is, the longer it takes for a gas to reach the detector. Because some gases have a highly adsorptive feature for the tube, resulting in a slow response and a lower reading than the actual value, the length of the GAS IN tube must be minimized.

• When the humidity in the sampling point is high, condensation may be formed inside of the tube. Make sure to avoid condensation when using a gas which is solved into water and corrodes contacted materials, such as a strong acid gas, because it is undetectable and furthermore may corrode internal parts. Also avoid an excessive U-shaped or V-shaped tube piping.

• Determine the inlet for the sample gas, considering the air flow of the sample gas line and the gas generating process.

• To remove dust, do not forget to attach the supplied dust filter in the middle of the tube.

• You need to decide the length and material of the tube. Please contact our sales department for

more information.

GD-70D - 28 -

Page 29

2 Installation 2-4. Relocate

2-4. Relocate

When the detector is relocated, select a new place in accordance with "Precautions for installation site" and "2-2. How to install". For information on wiring and tubing, see "2-3. How to wire" and "How to tube". The unpowered time must be minimized when the detector is relocated.

 CAUTION

• When you use a relocated or stopped/stored detector again, do not forget to perform a gas calibration. For information on readjustment including gas calibration, please contact our sales department.

2-5. Disposal

• A used sensor unit must be returned to us. Please return the sensor unit to our sales department.

• If liquid is leaked from the electrochemical type sensor unit (ESU) or galvanic cell type sensor unit (OSU),

do not touch the liquid. The sensor unit must be put into a plastic bag to prevent leaking. If liquid is leaked from the sensor of the detector, turn "off" the power and contact our sales department immediately.

• Because the pyrolysis-particle type sensor unit (SSU) contains a small amount of radioactive materials, it must be transported appropriately (as a L-type package). When the sensor unit is returned to us, it must be handled by a transportation company which can handle L-type packages.

• When the detector is disposed of, it must be treated properly as an industrial waste in accordance with the local regulations.

 WARNING

• Do not disassemble the electrochemical type sensor unit (ESU) or the galvanic cell type sensor unit (OSU) because they contain electrolyte. Electrolyte may cause severe skin burns if it contacts skin, while it may cause blindness if its contacts eyes. If electrolyte is adhered on you clothes, that part on your clothes is discolored or its material is decomposed. If contact occurs, rinse the area immediately with a large quantity of water.

• The pyrolysis-particle type sensor unit (SSU) must be returned to us in accordance with its "Safety Manual". We will properly dispose of it. Ignoring the "Safety Manual" will result in legal penalties.

- 29 - GD-70D

Page 30

3 How to Operate 3-1. Preparation for start-up

How to Operate

3-1. Preparation for start-up

Before connecting a power supply, read and understand the following precautions. Ignoring these precautions may cause an electric shock or damage the detector.

• Connect the detector to a grounding circuit.

• Check whether the wiring is connected to external circuit properly.

• Check whether the power supply voltage is compliant with the specification.

• Because the external contact may be activated during the adjustment, take measures to prevent an

activated contact from having influences on external circuits.

• Verify that there is no clogging or leak in the connected tube. (If the connected tube is clogged, pressure is applied to the sensor unit, causing errors and malfunctions. Please note that the reading is fluctuated in the galvanic cell type, which may result in a false alarm.)

• Verify that the filter is attached correctly. (The filter is specified based on the gas to be detected.)

3-2. How to start the detector

• Before turning on the power switch, check whether the detector is installed properly.

• The power switch is protected by a cover to prevent access to it in a normal time. To turn ON/OFF the power switch, rotate the switch cover. (Return the switch cover to the original position after the switching is completed.)

• Turn ON the power switch.

• After the detector completes the start-up, it enters the detection

mode.

Power switch

When the switch cover is closed

When the switch cover is open

OFF ON

Slide

GD-70D - 30 -

Page 31

3 How to Operate 3-2. How to start the detector

<Start-up Procedures (approximately 25 seconds for system check of the detector and alarm deactivation)>

Power On

↓

Initial Clear

PW A1 A2 F

● ○ ○ ○

──────

LCD

PW:POWER A1:ALM1 A2:ALM2 F:FAULT

●:Lamp on ○:Lamp off

WARM UP

↓

Gas Specifications Display

↓

Detection Mode

● ○ ○ ○

↓

15.0ppm

SIH4

↓

0.0ppm

SIH4

 WARNING

• When Oxygen (OSU) is selected, approximately AIR (normal oxygen concentration) (20.9 vol%) is output after the detector is started in the atmosphere. For a specification where an alarm is triggered by the AIR (normal oxygen concentration) output (e.g., 0 - 5 vol%), be careful of an alarm issue after the detector is started.

 CAUTION

• Do not turn off the detector during the initial clear. The detector is reading the sensor memory during the initial clear.

• If a new sensor unit is installed or the sensor unit is replaced after the detector is started, the sensor unit must be warmed up for a specified period which is determined depending on the type of the sensor unit. When the semiconductor type sensor unit (SGU) is selected, the suggested warm-up completion time is displayed in the maintenance mode. During the warm-up, the alarm activation and output signals are unstable. Provide a prior notification to the related sections so that they can prepare for false abnormalities.

• Because the pyrolyzer unit (PLU-70) must be warmed up for one hour, please warm it up with the detector.

• After the warm-up is completed, verify that the reading on the flow rate indicator corresponds to the specified flow rate, and then perform a gas calibration.

- 31 - GD-70D

Page 32

3 How to Operate 3-3. How to exit

3-3. How to exit

To turn off the detector, open the switch cover on the bottom of the main unit, and turn "OFF" the power switch. Then, turn off the power supply (24 VDC) to the detector.

 WARNING

• When the detector is turned off, an alarm may be activated on the upper (central) system. Before turning off the detector, the inhibit (point skip) on the upper (central) system must be activated. Decide whether the power can be turned off by checking the operation of the devices connected to the external output or external contact output terminal of the detector.

• If the alarm contact is energized (option), it is activated when the detector is turned "OFF".

• If the gas to be detected has an adsorptive feature, the detector must be cleaned thoroughly with

fresh air before turning "OFF" the detector.

3-4. Basic operating procedures

Normally, the detection mode is activated after the power is turned on.

The detector is restarted after recovering from Fault.

PW A1 A2 F LCD

● ● ○ ○

PW A1 A2 F LCD

● ○ ○ ●

PW A1 A2 F LCD

● ○ ○ ○

<<Gas Alarm Status>>

<<Fault Alarm Status>>

<<Gas Alarm Test Mode>>

PW A1 A2 F LCD

● ○ ○ ○

SIH4

<<Detection Mode>>

6.0ppm

E-5

FLOW

0.0ppm

TEST OFF

MAINTENANCE

0.0ppm

SIH4

<<Maintenance Mode (user mode)>>

PW A1 A2 F LCD

● ○ ○ ○

<<Maintenance Mode (regular maintenance mode)>>

PW A1 A2 F LCD

● ○ ○ ○

MODE (long pressing)

TEST (long pressing)

PW:POWER A1:ALM1 A2:ALM2 F:FAULT

MAINTENANCE

GAS TEST

MAINTENANCE

●:Lamp on ○:Lamp off

MODE (long pressing)

1- 1

ZERO

2- 0

GD-70D - 32 -

Page 33

3 How to Operate 3-5. Modes

 WARNING

• When the detector enters each mode from the detection mode while an alarm is activated, the alarm contact is released.

Flow Rate Indicator

Because the suction flow rate of the detector is automatically adjusted by the flow rate control function, the flow rate, in principal, does not need to be controlled. As shown on the figure below, when the flow rate does not correspond to the specified flow rate for some reasons, it is adjusted automatically.

 CAUTION

• If the automatic flow rate adjustment does not work (due to clogged tube or leak), messages such as "FLOW" for an unstable flow rate or "E-05" for flow rate abnormalities are displayed. In this case, you must identify the causes and take appropriate actions.

Flow rate

Normal

Flow rate

3-5. Modes

Details on each mode are provided as follows. (* Operations are slightly different depending on the detector type or sensor unit.)

Mode Item LCD Display Details

Detection Mode - Gas concentration

Gas Alarm Test Mode Maintenance Mode (user mode)

- Gas concentration Perform the alarm test.

Zero Adjustment (Span Adjustment) Setting Display 1-2 CONFIRM Show the setting of typical menus.

Flow Rate Indicator 1-3 FLOW Show the current flow rate. Address Display 1-4 ADDRESS Show the address. Detector Version Display 1-5 70D VER Show the program version of the main unit. Unit Version Display 1-6 UNIT VER Show the program version of the sensor unit. Net Version Display 1-7 NET VER Show the program version of the communication function.

Gas name

1-1 ZERO (1-1 SPAN)

Normal state

Perform the zero adjustment. (In case of oxygen 0 - 25 vol%, perform the span adjustment.)

• First Alarm Setpoint (AL1)

• Second Alarm Setpoint (AL2)

• Alarm delay time

Zero suppression value

•

Zero Follower ON/OFF

• Sensitivity Correction ON/OFF

- 33 - GD-70D

Page 34

3 How to Operate 3-5. Modes

Mode Item LCD Display Details

Regular Maintenance

Mode Switching Maintenance Mode (regular maintenance mode)

Gas Introduction Display 2-0 GAS TEST Perform the gas introduction test in the regular maintenance mode.

Zero Adjustment 2-1 ZERO Perform the zero adjustment.

Span Adjustment 2-2 SPAN Perform the span adjustment.

Last Calibrated Date 2-3 LAST CAL Show the last calibrated date.

Bias Voltage (Element

Voltage)

Flow Rate Setting

(adjusted to 0.5 L/min)

Pump Ratio/Flow Rate

Indicator

Detector Temperature 2-7 TEMP Show the current temperature of the installation environment.

Suggested Warm-up

Completion Date/Time

Environmental Setting 1 2-9 SETTING1 Operation setting

Environmental Setting 2 2-10 SETTING2 Functions setting

Pyrolyzer Data Display 2-11 PL DATA When the pyrolyzer unit (PLU-70) is used, a variety of pyrolyzer data

Fault Investigation 2-12 FAULT Not used

Factory Mode Switching 2-13 F MODE Not used

1-8 M MODE Switch to the regular maintenance mode.

2-4 BIAS (2-4 E VOLT) 2-5 DEF FLOW Set the flow sensor with the flow rate at 0.5 L/min.

2-6 FLOW Show the output and flow rate of the current pump.

2-8 WARMTIME Show the suggested warm-up completion for semiconductor type

Show the bias voltage. (Show the element voltage.)

(SGU).

• INHIBIT setting (INHIBIT)

Alarm value setting (ALM P)

•

Alarm delay time setting (ALM DLY)

• Regular replacement operation (pump stop) (MAINTE)

Fault test (F TEST)

•

Address setting (ADDRESS)

• Date/Time setting (DAY TIME)

• Zero suppression value setting (SUPPRESS)

• Zero suppression system setting (SUP TYPE)

• Alarm test time contact setting (TEST RLY)

• Alarm test time external output setting (TEST4-20)

• Energized/De-energized setting (RLY PTRN)

• Alarm type setting (ALM TYP)

• Alarm activation setting (ALM PTRN)

• Alarm value limiter setting (AL LIMIT)

• Fault activation setting (FLT PTRN)

• Flow rate auto-adjustment setting (AT FLOW)

• Zero follower ON/OFF setting (ZERO F)

• 24 hours zero follower ON/OFF setting (ZERO 24F)

• Sensitivity correction ON/OFF setting (S ASSIST)

• External output in maintenance mode setting (MNT OUT)

• External output adjustment (MA 4-20)

• Backlight setting (BK LIGHT)

• ETHERNET setting (ETHERNET)

Pump drive level diagnosis ON/OFF setting (PUMP CK)

•

is displayed. (See the operating manual for PLU-70)

GD-70D - 34 -

Page 35

4 Detection Mode 4-1. Gas alarm activation

Detection Mode

4-1. Gas alarm activation

Gas alarm: Activated when the concentration of detected gas reaches or exceeds the alarm setpoint. <<Auto-Reset Operation>>

NOTE

The alarm setpoint (first alarm and second alarm) is entered before it is delivered from the factory. Although the alarm delay time (standard: 2 seconds) is enabled in the detector to prevent a false activation, you can disable it if not needed.

Gas Concentration Display

In case of over the detection range (Over Scale), "∩∩∩∩" is displayed on the LCD.

Power Indicator Lamp (POWER: Green)

This lights up continuously.

Alarm Indicator Lamp (ALM1: Red), (ALM2: Red)

The alarm consists of two steps. Each of them lights up when respective alarm setpoint is reached or exceeded.

- 35 - GD-70

Page 36

4 Detection Mode 4-1. Gas alarm activation

)

The contact is activated when the gas concentration reaches or exceeds the alarm setpoint. The contact activation is reset automatically when the gas concentration drops below the alarm setpoint.

'Alarm Pattern (H-HH)'

Concentration

larm delay time (2 seconds)

'Alarm Pattern (L-LL)' (* oxygen deficiency alarm)

Concentration

larm delay time (2 seconds)

Second alarm setpoint

First alarm setpoint

Time

larm lamp (ALM 1) larm contact (terminal plate 5, 6)

larm lamp (ALM 2) larm contact (terminal plate 7, 8

First alarm setpoint

Second alarm setpoint

Time

larm lamp (ALM 1) larm contact (terminal plate 5, 6)

larm lamp (ALM 2) larm contact (terminal plate 7, 8)

GD-70D - 36 -

Page 37

4 Detection Mode 4-2. Fault alarm activation

ate abnormalities)

In case of responding to a leaked gas

When a gas alarm is triggered, take actions in accordance with your management rules of gas alarm. Normally, take the following actions.

• Check the reading of the detector.

NOTE

If a gas leak is momentary, the reading may already have dropped when you check it. In addition, when the alarm is triggered by noise or other incidental conditions other than a gas, the reading may have already dropped.

• Based on your management rules of gas alarm, no one can be allowed to access the monitored zone to ensure safety.

• If the Gas Concentration Display continues to be shown, close the main valve of the gas, and then verify that the gas concentration reading dropped.

• Equipped with a protective gear to avoid dangers caused by possibly remaining gases, before accessing the gas leak point, and then check whether gases remain by using a portable gas detector.

• If you can determine that the point is free from dangers, take actions to fix the gas leak.

4-2. Fault alarm activation

A fault alarm is triggered when the detector detects abnormalities. After a fault alarm is triggered, the FAULT lamp (yellow) lights up and an error message is displayed on the LCD. Determine the causes and take appropriate actions. After the detector is successfully returned from the fault, it restarts with the process normally performed right after it is turned on (initial clear). If the detector has problems and is repeatedly malfunctioning, please contact us immediately.

NOTE

For information on malfunctions (error messages), see "9. Troubleshooting".

* E-5 FLOW (flow r

- 37 - GD-70D

Page 38

4 Detection Mode 4-3. External output operation

4-3. External output operation

Specifications 4 - 20 mA Power-line communication system (NT)

Signal Transmission System Electric current transmission (non-isolated) 2-wire type DC power-line communication

system

Transmission Path CVVS KPEV-S

Transmission Distance Below 1 km Below 300 m (depending on the system

designing conditions)

Connection Load Resistance Below 300 Ω -

Detection Mode (No Alarm) 4 - 20 mA (concentration output) Concentration data

Detection Mode (Gas Alarm) 4 - 20 mA (concentration output) Concentration data, Alarm bits

Initial Clear

Maintenance Mode 2.5 mA setting: 2.5 mA

Alarm Test Output ON setting: 4 - 20 mA (concentration output)

Fault Alarm 0.5 mA (Fixed) Fault bits

Inhibit

Power Off 0 mA Signal OFF

Depending on the setting of f

2.5 mA setting: 2.5 mA 4 mA, HOLD, 4-20 mA setting: 4 mA*

4 mA setting HOLD Setting: the previous value retained 4-20 mA setting

Output OFF setting: In accordance with setting of f

Depending on the setting of f

2.5 mA setting: 2.5 mA 4 mA, HOLD, 4 - 20 mA setting: 4 mA*

: 4mA*

: 4 - 20 mA (concentration output)

* OSU - 0 - 25 vol% is equivalent of AIR (20.9 vol% = 17.4 mA)

Initial bit

Concentration data, Adjustment bit

Concentration data, Adjustment bit, Test bit

Concentration data, Adjustment bit, Inhibit bit

GD-70D - 38 -

Page 39

4 Detection Mode 4-3. External output operation

Example of Gas Concentration and External Output

4 - 20 mA Specification (Maintenance output: 2.5 mA setting)

External out

22mA 20mA

4mA

2.5mA

 CAUTION

<<4 - 20 mA Specification>>

• The 4 - 20 mA output is already adjusted. In case of over scale, an output will not exceed 22 mA.

• Output during inhibit or initial clear is based on 4 - 20 mA output setting in the maintenance mode.

Be careful for a possible lower output which drops as low as 2.5 mA during initial clear when OSU (L alarm) is used. In particular, this occurs when the detector is started or the specification is changed. Understand how the detector functions, and take actions, if necessary, so that the receiver side can prepare for false alarms.

Example of Items which Requires Special Precautions>

Maintenance output setting Sensor unit Details

2.5 mA Use OSU (L-LL, L-H). Output 2.5 mA during maintenance or inhibit.

4 mA, HOLD, 4 - 20 mA

Specification change (To OSU - 0 - 25 vol%)

Specification change (From OSU - 0 - 25 vol%)

Zero suppression

Possibility of false alarm in the upper unit (L alarm) In case of a change from another principle (H-HH), 4 mA (equivalent of concentration zero) is used until the change is confirmed "C-02". In case of a change from 0 - 25 vol% (L-LL,L-H), 17.4 mA (equivalent of approx. 84%FS) is used until the change is confirmed "C-02".

Full scale

Gas concentration

Detection mode

Maintenance mode

- 39 - GD-70D

Page 40

4 Detection Mode 4-4. Other functions

4-4. Other functions

Some types of sensor used with the detector are influenced by environmental changes (temperature, humidity, and other characteristics) or interference gases (interference characteristics) in no small measure, which affects the reading. Therefore, the reading might vary around zero even in a normal environment with no gas leakage. This function obscures influences by environmental changes and interference gases around zero that have no meaning for your management rules of gas alarm. This function is used to hide (suppress) the variation of the reading under the setting value, indicating zero.

<<Example: SiH4 0 - 15 ppm rated range>>

0.5ppm

Suppression Disabled A variation around zero is displayed as the reading.

SIH4

↓

0.0ppm

SIH4

NOTE

In the maintenance mode, this function is disabled and the variation of the reading under the setting value is displayed.

When a sensor unit with the oxygen deficiency alarm (OSU 0 - 25 vol%) is equipped, the zero suppression is shifted to AIR suppression automatically. That is, a small variation of the reading around 20.9 vol% is displayed as 20.9 vol%.

 CAUTION

• A reading under zero is suppressed with the 10% FS suppression.

• A reading that is 10% FS or more under zero is displayed as "-0.0", which prevents an accurate gas

detection and needs the zero adjustment.

Suppression Enabled A variation under the standard setting value = 6% FS (0.9 ppm) is hidden with zero. (Zero suppression)

GD-70D - 40 -

Page 41

4 Detection Mode 4-4. Other functions

Some types of sensor used with the detector might have sensitivity variations after being used for a long period. This function corrects the variation of the reading at the zero point (zero drift) among the sensitivity variations over time by a program manipulation to stabilize the zero point, and works on the electrochemical type (ESU) and pyrolysis-particle type (SSU).

<Sensitivity Correction

Reading

* The zero drift of the sensor appears as the reading.

Reading

* The zero adjustment is made periodically.

Reading

Zero Follower Off

Zero point

Time

↓

Zero Follower On

Zero point

Time

Sensitivity Correction Off

Function>

Some types of sensor used with the detector might have sensitivity variations after being used for a long period. This function compensates the degradation of the gas sensitivity among the sensitivity variations over time. It works on the electrochemical type (ESU) and makes the span adjustment by a program manipulation based on the principled degradation pattern.

Gas correction

* The sensor sensitivity becomes degraded.

Time

↓

Sensitivity Correction On

Reading

Gas correction

* The span is lifted up periodically.

- 41 - GD-70D

Time

Page 42

4 Detection Mode 4-4. Other functions

 CAUTION

The sensitivity correction is just an auxiliary function. It uniformly lifts the span up based on the principled degradation pattern only and cannot consider the sensitivity variation of an individual sensor. To correct the sensitivity variation of an individual sensor, you must make the regular span adjustment using an adjustment gas.

The detector and the sensor unit have their own history functions. To use these functions, contact our sales department.

The detector has the function to automatically recognize the sensor unit when the sensor unit is replaced or the specification is changed. When a sensor unit with a different serial number or with a different principle or specification is attached, one of the following messages is displayed for helping the correct installation.

C-01

CHG UNIT

MAINTENANCE

Unit Replacement Displayed when a unit with the same specification (principle, type, range, and so on) is attached (e.g. in a regular replacement). Press the MODE key to recognize the new sensor unit and start the monitor.

↓

C-02

CHG SPEC

MAINTENANCE

Specification Change Displayed when a unit with a different specification (principle, type, range, and so on) from the previous one is attached. Press the MODE key to recognize the unit with the new specification and start the monitor. If you do not intend the specification change, this message might mean the installation error. Check the correct installation.

 CAUTION

If you confirm the specification change (principle, sensor type, detected gases, detectable range, and so on) of the sensor unit for "C-02", the specification of the gas detector head is changed. Note that it resets the alarm setpoint (ALM P) as well as the following parameters to the standard setting values. If you want to use nonstandard setting values, set them in the maintenance mode.

• Alarm delay time setting (ALM DLY)

• Suppression value (SUPPRESS)

• Alarm type (ALM TYP) ...... The OSU specification includes "L-LL", "L-H", and "H-HH".

ESU SSU SGU OSU

Alarm delay 2 seconds 2 seconds 2 seconds 2 seconds 2 seconds 2 seconds Suppression value Alarm type H-HH H-HH H-HH L-LL H-HH H-HH

"Change from OSU (L-LL alarm)" or "change to OSU (L-LL alarm)" reverses the direction of the alarm. It requires special care because the previous settings are kept for the external output and other settings in the maintenance mode. Immediately after "C-02" is confirmed with the MODE key, the initial clear is started and the new actions are enabled. (The initial clear output is shifted together.)

GD-70D - 42 -

6 %FS 2 ppm

(TEOS)

10 %FS 0.5 vol%

(0 - 25 vol%)

(AIR supp)

OSU (0 - 5 vol%)

0 vol% 0 vol%

OSU (0 - 50 vol%)

Page 43

5 Alarm Test Mode

Alarm Test Mode

This is used when dummy signals the same as the signals of the gas concentration are generated to check the alarm lamp activation of the detector and the transmission to external circuits.

 WARNING

• Before starting the alarm test (transmission test), provide a notification to the related sections so that they can prepare for false abnormalities (external output signals and alarm contact). After the test is completed, do not forget to press the TEST key to return to the detection mode. (If the detector remains in the alarm test mode, it automatically returns to the detection mode in ten hours.)

Alarm Test Mode

Detection Mode

Press the TEST key for three seconds.

PW A1 A2 F

● ○ ○ ○

LCD

0.0ppm

SIH4

↓ ↓

Alarm Test Mode

The message "TEST ON" is displayed when the contact is activated in the alarm test, while the message "TEST OFF" is displayed when not activated. (The setting can be changed.) Increase or decrease the reading by pressing the ▲ or ▼ key.

● ○ ○ ○

0.0ppm

TEST OFF

MAINTENANCE

↓

First Alarm

When the reading reaches the first alarm, the ALM1 lamp lights up. (When Contact ON is selected, the first alarm contact is activated.)

● ○ ○ ○

5.0ppm

TEST OFF

MAINTENANCE

↓

Second Alarm

When the reading reaches the second alarm, the ALM2 lamp lights up. (When Contact ON is selected, the second alarm contact is activated.)

● ○ ○ ○

↓

10.0ppm

TEST OFF

MAINTENANCE

- 43 - GD-70

Page 44

6 User Mode

User Mode

 WARNING

After the adjustment is completed, do not forget to press the MODE key to return to the detection mode. (If the detector remains in the user mode, it automatically returns to the detection mode in ten hours.)

User Mode

Detection Mode

Press the MODE key for three seconds.

↓

User Mode

1-1.ZERO

Perform the zero adjustment.

1-2.CONFIRM

Show the typical setpoint.

1-3.FLOW

Show the current flow rate.

1-4.ADDRESS

Show the address. (NT specification)

PW A1 A2 F LCD

● ○ ○ ○

0.0ppm

SIH4

● ○ ○ ○

↓

1- 1

→

SET

ZERO

MAINTENANCE

● ○ ○ ○

▲↓ ↑▼

1- 2

→

SET

CONFIRM

MAINTENANCE

● ○ ○ ○

▲↓ ↑▼

1- 3

→

SET

FLOW

● ○ ○ ○

MAINTENANCE

▲↓ ↑▼

1- 4

MAINTENANCE

→

SET

ADDRESS

MAINTENANCE

▲

↓ ↑▼

MAINTENANCE

Zero Adjustment ⇒P46

Setpoint Display ⇒P47

0.50

ADDRESS

L/M

GD-70 - 44 -

Page 45

6 User Mode

1-5.70D VER

Show the program version of the main unit.

1-6.UNIT VER

Show the program version of the installed sensor unit.

1-7.NET VER

Show the program version of the communication function. (NT specification)

1-8.M MODE

Switch to the regular maintenance mode.

● ○ ○ ○

1- 5

70D VER

MAINTENANCE

▲↓ ↑▼

1- 6

UNIT VER

MAINTENANCE

▲↓ ↑▼ ▲↓ ↑▼

1- 7

NET VER

MAINTENANCE

▲↓ ↑▼

1- 8

M MODE

MAINTENANCE

▲

To 1-1.ZERO

↓ ↑▼

→

SET

01234

MAINTENANCE

→

SET

01234

MAINTENANCE

→

SET

01234

MAINTENANCE

→

SET

See "7. Regular Maintenance Mode".

56AB

----

- 45 - GD-70D

Page 46

6 User Mode

This is used to perform the zero adjustment. Before starting the zero adjustment, let the detector suck the zero adjustment gas and wait until the indicator is stabilized. For oxygen deficiency alarm specification (OSU - 0 to 25 vol%), "1-1" is the span adjustment. In this case, the AIR adjustment is performed, so that fresh air must be introduced to adjust it to 20.9 vol%. For information on the span adjustment, see "7-2. How to perform a gas calibration".

Zero Adjustment

1-1.ZERO

Press the SET key.

PW AL1 AL2 F LCD

● ○ ○ ○

1- 1

ZERO

MAINTENANCE

↓

Current Concentration Value Display

Press the SET key to perform the zero adjustment.

↓

Zero Adjustment Completed

The menu returns to 1-1.ZERO automatically.

* When the zero adjustment fails

● ○ ○ ○

↓

1.1ppm

ZERO SET

MAINTENANCE

↓

0.0ppm

ZERO OK

MAINTENANCE

↓

Return to 1-1.ZERO

0.0ppm

ZERO NG

MAINTENANCE

↓

Return to 1-1.ZERO

GD-70D - 46 -

Page 47

6 User Mode

This is used to check important setpoints.

Setpoint Display

1-2.CONFIRM

Press the SET key.

PW A1 A2 F LCD

● ○ ○ ○

1- 2

↓

First Alarm Setpoint Indicator

Second Alarm Setpoint Indicator

Alarm Delay Time Display (seconds)

Zero Suppression Value Display

● ○ ○ ○

CONFIRM

MAINTENANCE

↓

5.0ppm

AL 1

MAINTENANCE

▲↓ ↑▼

10.0ppm

AL 2

MAINTENANCE

▲↓ ↑▼

ALM DLY

MAINTENANCE

▲↓ ↑▼

0.9ppm

SUPPRESS

MAINTENANCE

Zero Follower ON/OFF Display

(If ESU or SSU installed)

● ○ ○ ○

▲↓ ↑▼

ZERO F

MAINTENANCE

Sensitivity Correction ON/OFF Display

(If ESU installed)

● ○ ○ ○

▲↓ ↑▼

OFF

S ASSIST

MAINTENANCE

▲

↓ ↑▼

To F i r s t Al a r m

Setpoint Indicator

- 47 - GD-70D

Page 48

7 Regular Maintenance Mode

Regular Maintenance Mode

 WARNING

After the adjustment is completed, do not forget to press the MODE key to return to the detection mode. (If the detector remains in the maintenance mode, it automatically returns to the detection mode in ten hours.)

Mode Item LCD Display Details Maintenance Mode (regular maintenance mode)

Gas Introduction Display 2-0 GAS TEST Perform the gas introduction test in the regular

maintenance mode.

Zero Adjustment

⇒P65

Span Adjustment

⇒P65

Last Calibrated Date

Bias Voltage (Element Voltage)

Flow Rate Setting (adjusted to 0.5 L/min)

⇒P67

Pump Ratio/Flow Rate Indicator

⇒P67

Detector Temperature

Suggested Warm-up Completion Date/Time

Environmental Setting 1

⇒P53

2-1 ZERO Perform the zero adjustment.

2-2 SPAN Perform the span adjustment.

2-3 LAST CAL Show the last calibrated date.

2-4 BIAS (2-4 E VOLT)

2-5 DEF FLOW

2-6 FLOW Show the output and flow rate of the current pump.

2-7 TEMP Show the current temperature of the installation

2-8 WARMTIME

2-9 SETTING1 Operation setting

Show the bias voltage. (Show the element voltage.)

Set the flow sensor with the flow rate at 0.5 L/min.

environment. Show the suggested warm-up completion for semiconductor type (SGU).

• INHIBIT setting (INHIBIT)

• Alarm value setting (ALM P) ⇒P54

• Alarm delay time setting (ALM DLY)

• Regular replacement operation (pump stop)

(MAINTE)

• Fault alarm test (F TEST)

⇒P54

GD-70 - 48 -

Page 49

7 Regular Maintenance Mode

Mode Item LCD Display Details

Environmental Setting 2

⇒P55

2-10 SETTING2

Functions setting

• Address setting (ADDRESS)

• Date/Time setting (DAY TIME) ⇒P60

• Zero suppression value setting (SUPPRESS)

• Zero suppression system setting (SUP TYPE)

• Alarm test time contact setting (TEST RLY)

• Alarm test time external output setting (TEST4-20)

• Energized/De-energized setting (RLY PTRN)

⇒P61

• Alarm type setting (ALM TYP)

• Alarm activation setting (ALM PTRN)

• Alarm value limiter setting (AL LIMIT)

• Fault activation setting (FLT PTRN)

• Flow rate auto-adjustment setting (AT FLOW)

• Zero follower ON/OFF setting (ZERO F)

• 24 hours zero follower ON/OFF setting (ZERO 24F)

• Sensitivity correction ON/OFF setting (S ASSIST)

• External output in maintenance mode setting (MNT

OUT)

• External output adjustment (MA 4-20)

• Backlight setting (BK LIGHT)

• ETHERNET setting (ETHERNET)

• Pump drive level diagnosis ON/OFF setting (PUMP

CK)

Pyrolyzer Data Display 2-11 PL DATA When the pyrolyzer unit (PLU-70) is used, a variety of

pyrolyzer data is displayed. (See the operating manual for PLU-70)

Fault Investigation

Factory Mode Switching 2-13 F MODE Not used

2-12 FAULT Not used

- 49 - GD-70D

Page 50

7 Regular Maintenance Mode

Regular Maintenance Mode

PW A1 A2 F LCD

User Mode

In "1-8.M MODE", press the SET key.

↓

Then press the SET key again for three seconds.

● ○ ○ ○

1- 8

M MODE

MAINTENANCE

↓

- - - -

PW: POWER A1: ALM1 A2: ALM2 F: FAULT

●: Lamp on ○: Lamp off

M MODE

MAINTENANCE

→

SET

0.2ppm

GAS TEST

MAINTENANCE

↓(Alternate Display)↑

0.2ppm

SIH4

MAINTENANCE

→

SET

Zero Adjustment ⇒P65

↓

Regular Maintenance Mode

2-0.GAS TEST

Perform a test with the gas. Similar to the detection mode, the reading changes and the alarm lamp lights up after the gas is introduced, but the contact is not activated.

2-1.ZERO

Perform the zero adjustment.

● ○ ○ ○

↓

2- 0

GAS TEST

MAINTENANCE

| ↑

▲| |▼

↓ |

2- 1

ZERO

MAINTENANCE

→

SET

Span Adjustment ⇒P66

2-2.SPAN

Perform the span adjustment.

● ○ ○ ○

▲↓ ↑▼

2- 2

SPAN

MAINTENANCE

→

SET

12:00

2-3.LAST CAL

Show the last calibrated date.

● ○ ○ ○

▲↓ ↑▼

2- 3

LAST CAL

MAINTENANCE

2-4.BIAS

Show the bias voltage "BIAS" of electrochemical type (ESU) or the element voltage "EVOLT" of semiconductor type (SGU).

GD-70D - 50 -

● ○ ○ ○

▲↓ ↑▼

2- 4

BIAS

MAINTENANCE

▲↓ ↑▼

→

SET

2009.01.01

MAINTENANCE

BIAS

MAINTENANCE

0 mV

Page 51

7 Regular Maintenance Mode

2-5.DEF FLOW

Set the flow rate to the default value when the flow sensor is replaced, etc. Normally, this is not used because the detector has already been adjusted. On the other hand, if the flow meter is set at other than the specified flow rate, gases cannot be detected properly due to an incorrect flow rate. (Press the MODE key to cancel this menu.)

2-6.FLOW

Show the output and flow rate of the current pump.

2-7.TEMP

Show the temperature of the detector.

2-8. WARMTIME

Show the suggested warm-up completion date/time for semiconductor type (SGU), which requires a long warm-up time.

2-9. SETTING1

Specify the environmental setting 1.

2-10.SETTING2

Specify the environmental setting 2.

2-11.PL DATA

Show the pyrolyzer data when the pyrolyzer unit (PLU-70) is used.

● ○ ○ ○

▲↓ ↑▼

2- 5

DEF FLOW

MAINTENANCE

| ↑

| |

▲| |▼

↓ |

2- 6

FLOW

MAINTENANCE

▲↓ ↑▼

2- 7

TEMP

MAINTENANCE

▲↓ ↑▼

2- 8

WARMTIME

MAINTENANCE

▲↓ ↑▼

2- 9

SETTING1

MAINTENANCE

▲↓ ↑▼

2-10

SETTING2

MAINTENANCE

▲↓ ↑▼

2-11

PL DATA

MAINTENANCE

▲↓ ↑▼

⇔

SET

⇔

SET

→

SET

→

SET

→

SET

→

SET

→

SET

1000

DEF FLOW

MAINTENANCE

50 %

0.50 L/M

MAINTENANCE

25.0 °C

TEMP

MAINTENANCE

12:00

2009.01.01

MAINTENANCE

Environmental Setting 1 ⇒P53

Environmental Setting 2 ⇒P55

For information on Pyrolyzer Data Display, see "PLU-70 Operating Manual".

- 51 - GD-70D

Page 52

7 Regular Maintenance Mode

2-12.FAULT

This is used (by the manufacturer) to investigate and analyze the causes of faults. This is not used by the user.

2-13.F MODE

Changes to the factory mode. This is not used by the user.

● ○ ○ ○

▲↓ ↑▼

2-12

FAULT

MAINTENANCE

▲↓ ↑▼

2-13

F MODE

MAINTENANCE

▲↓ ↑▼

To 2-0.GAS TEST

GD-70D - 52 -

Page 53

7 Regular Maintenance Mode

In the environmental setting 1, specify the operation setting.

Environmental Setting 1

PW A1 A2 F LCD

2-9.SETTING1

Press the SET key.

● ○ ○ ○

2- 9

SETTING1

MAINTENANCE

⇔

SET

MAINTENANCE

INHIBIT

⇔

SET

Alarm Value Setting ⇒P54

OFF

INHIBIT

▲↓↑▼

INHIBIT

↓

SET 0.INHIBIT

Set the inhibit. Select either ON/OFF, and then press the SET key to confirm the selection. When ON is selected, the message INHIBIT is displayed on the LCD. As a result, an alarm is not triggered to external circuits even though the detector is in the detection mode.

SET 1.ALM P

Set the alarm value.

● ○ ○ ○

↓

SET 0

INHIBIT

MAINTENANCE

| ↑

▲| |▼

↓ |

SET 1

ALM P

MAINTENANCE

⇔

SET

⇔

SET

⇔

SET

ALM DLY

MAINTENANCE

-----

MAINTE

MAINTENANCE

Pump Stop

(Drive Sound Stop)

Fault Alarm Test ⇒P54

SET 2.ALM DLY

Set the alarm delay time. Select the number (second) by pressing the ▲ or ▼ key, and then press the SET key to confirm the value.

SET 3. MAINTE

This is used to stop only the pump for replacing the pump or for another purpose. Press the SET key to stop the pump. Press the SET key again to restart the pump, which returns to the original state. (You can also press the MODE key to cancel this menu and restart the pump.)

SET 4.F TEST

Perform a fault alarm test.

● ○ ○ ○

▲↓ ↑▼

SET 2

ALM DLY

MAINTENANCE

▲↓ ↑▼

SET 3

MAINTE

MAINTENANCE

| ↑

▲| |▼

↓ |

SET 4

F TEST

MAINTENANCE

▲

↓ ↑▼

SET 0.INHIBIT Setting

- 53 - GD-70D

Page 54

7 Regular Maintenance Mode

Alarm Value Setting

PW A1 A2 F LCD

SET 1.ALM P

Press the SET key.

● ○ ○ ○

SET 1

ALM P

MAINTENANCE

↓

First Alarm Value Setting

Select the number by pressing the ▲ or ▼ key, and then press the SET key to confirm the value. (Press the MODE key to skip this menu.)

↓

Second Alarm Value Setting

Select the number by pressing the ▲ or ▼ key, and then press the SET key to confirm the value. (Press the MODE key to skip this menu.)

● ○ ○ ○

↓

5.0ppm

AL 1

MAINTENANCE

↓

10.0ppm

AL 2

MAINTENANCE

↓

Return to

SET 1.ALM P

PW A1 A2 F LCD

SET 4.F TEST

Press the SET key.

● ○ ○ ○

SET 4

F TEST

MAINTENANCE

↓

Fault Test ON/OFF

Select either ON/OFF. Switch ON and press the SET key to activate the fault alarm. Return to OFF and press the SET key to deactivate the fault alarm. (You can also press the MODE key to cancel this menu and go back to the original state.)

● ○ ○ ○

● ○ ○ ●

↓

OFF

F TEST

MAINTENANCE

▲↓ ↑▼

F TEST

MAINTENANCE

 WARNING

Because the contact (fault) can be activated only by a fault alarm test in the maintenance mode, be careful to perform the test. The fault alarm test cannot be performed during inhibit.

GD-70D - 54 -

Page 55

7 Regular Maintenance Mode

In the environmental setting 2, specify the settings of functions. (* It is recommended that setting changes should be recorded in a log.) The environmental setting 2 includes setting menus which are usually not used. Be careful not to change these settings by mistake.

Environmental Setting 2

PW A1 A2 F LCD

2-10.SETTING2

Press the SET key.

↓

SET 0. ADDRESS

Set the address. (NT specification) Select the number by pressing the ▲ or ▼ key, and then press the SET key to confirm the address.

SET 1.DAY TIME

Set the date/time of the main unit.

SET 2.SUPPRESS

Set the suppression value. Select the number by pressing the ▲ or ▼ key, and then press the SET key to confirm the value.

SET 3. SUP TYPE

Set the suppression system. Select either CUT/SLOPE, and then press the SET key to confirm the selection. When CUT (Cut Off) is selected, values exceeding the suppression value are directly displayed. When SLOPE (Slope) is selected, values exceeding the suppression value are gently displayed.

SET 4. TEST RLY

Set the contact activation for an alarm test. Select either ON/OFF, and then press the SET key to confirm the selection. When ON is selected, the contact can be activated even during an alarm test.

● ○ ○ ○

2-10

SETTING2

MAINTENANCE

↓

SET 0

ADDRESS

MAINTENANCE

▲↓ ↑▼

SET 1

DAY TIME

MAINTENANCE

▲↓ ↑▼

SET 2

SUPPRESS

MAINTENANCE

▲↓ ↑▼

SET 3

SUP TYPE

MAINTENANCE

| ↑

| |

▲| |▼

↓ |

SET 4

TEST RLY

MAINTENANCE

| ↑

▲

| |▼

⇔

SET

MAINTENANCE

⇔

SET

⇔

SET

Date/Time Setting ⇒P60

SUPPRESS

MAINTENANCE

⇔

SET

SUP TYPE

MAINTENANCE

SUP TYPE

MAINTENANCE

⇔

SET

MAINTENANCE

ADDRESS

0.9ppm

SLOPE

TEST RLY

CUT

▲↓↑▼

OFF

▲↓↑▼

TEST RLY

↓ |

MAINTENANCE

- 55 - GD-70D

Page 56

7 Regular Maintenance Mode

SET 5.TEST4-20

Set the external output for an alarm test. Select either ON/OFF, and then press the SET key to confirm the selection. When ON is selected, the external output is output even during an alarm test. When OFF is selected, the output is the same as the external output (selected in SET 15) in the maintenance mode. * When 4 - 20 mA is selected in SET 15, the output is made even though OFF is selected.

SET 6.RLY PTRN

Select either energized/de-energized for the contact. (Energized/De-Energized Contact Setting)

SET 7.ALM TYPE

Set the alarm type. When the galvanic cell type (OSU) is installed, you can select either L-LL, L-H, or H-HH.

● ○ ○ ○

▲

↓ ↑▼

SET 5

TEST4-20

MAINTENANCE

| ↑

| |

▲| |▼

| |

↓ |

SET 6

RLY PTRN

MAINTENANCE

▲↓ ↑▼

SET 7

ALM TYPE

MAINTENANCE

| ↑

| |

⇔

SET

⇔

SET

⇔

SET

TEST4-20

MAINTENANCE

▲↓↑▼

OFF

TEST4-20

MAINTENANCE

Energized/De-Ener gized Contact Setting

⇒P61

L-LL

ALM TYPE

MAINTENANCE

▲↓↑▼

L-H

ALM TYPE

| | | |

▲| |▼

MAINTENANCE

▲↓↑▼

H-HH

| |

SET 8.ALM PTRN

This is a setting screen of the gas alarm activation. Do not change the setting when the detector is used in a normal way, because it determines how the detector functions. (Auto-reset setting: "nL")

SET 9.AL LIMIT

This is a setting screen of the alarm value limiter. Do not change the setting when the detector is used in a normal way. (ON setting)

GD-70D - 56 -

● ○ ○ ○

MAINTENANCE

● ○ ○ ○

MAINTENANCE

↓ |

SET 8

ALM PTRN

▲↓ ↑▼

SET 9

AL LIMIT

↓ ↑▼

▲

ALM TYPE

MAINTENANCE

Page 57

7 Regular Maintenance Mode

SET 10. FLT PTRN

This is a setting screen of the fault alarm activation. Do not change the setting when the detector is used in a normal way, because it determines how the detector functions. (Auto-reset setting: "nL")

SET 11.AT FLOW

Set the flow rate auto-adjustment. Select either ON/OFF, and then press the SET key to confirm the selection. When ON is selected, the flow rate auto-adjustment is activated.

● ○ ○ ○

▲

↓ ↑▼

SET 10

FLT PTRN

MAINTENANCE

▲↓ ↑▼

SET 11

AT FLOW

MAINTENANCE

| ↑

▲| |▼

↓ |

SET 12. ZERO F

Set the zero follower when the electrochemical type (ESU) or the pyrolysis-particle type (SSU) is installed. Select either ON/OFF, and then press the SET key to confirm the selection. When ON is selected, the zero follower function is activated. * When SSU is installed, you must select ON.

SET 13.ZERO 24F

This is a supplemental setting screen for the above zero follower function. (A setting to determine whether the first-24-hour zero follower will be performed after the power is turned on.) Do not change the setting when the detector is used in a normal way. (ON setting)

SET 14.S ASSIST

Set the sensitivity correction when the electrochemical type (ESU) is installed. Select either ON/OFF, and then press the SET key to confirm the selection. When ON is selected, the sensitivity correction function is activated.

● ○ ○ ○

SET 12

ZERO F

MAINTENANCE

| ↑

▲| |▼

↓ |

SET 13

ZERO 24F

MAINTENANCE

| ↑

▲| |▼

↓ |

SET 14

S ASSIST

MAINTENANCE

| ↑

▲| |▼

↓ |

⇔

SET

⇔

SET

⇔

SET

AT FLOW

MAINTENANCE

▲↓↑▼

OFF

AT FLOW

MAINTENANCE

ZERO F

MAINTENANCE

▲↓↑▼

OFF

ZERO F

MAINTENANCE

S ASSIST

MAINTENANCE

▲↓↑▼

OFF

S ASSIST

MAINTENANCE

- 57 - GD-70D

Page 58

7 Regular Maintenance Mode

SET 15. MNT OUT

Set the external output for the maintenance mode. Select either 2.5 mA/4.0 mA/HOLD (previous value)/4

- 20 mA (linked to display value), and then press the SET key to confirm the selection. (4 - 20 mA specification)

SET 16.MA 4-20

Adjust the external output (4 20 mA). Adjust the output (%) by pressing the ▲ or ▼ key, and then press the SET key to confirm the value. (It must be adjusted to the upper unit or the ammeter.) After adjustment of 4 mA is completed, perform the adjustment of 20 mA. (Press the MODE key to skip this menu.) (4 - 20 mA specification)

SET 17.BK LIGHT

Set the backlight. Select either ON/SAVE, and then press the SET key to confirm the selection. When ON is selected, the backlight lights up continuously. When SAVE is selected, the backlight is usually turned off, but lights up only during an operation or event.

SET 18. ETHERNET

This is a setting screen of the ETHERNET setting. This is not used for the detector.

● ○ ○ ○

▲↓ ↑▼

SET 15

MNT OUT

MAINTENANCE

| ↑

| | | | | |

▲

| |▼ | | | | | |

↓ |

SET 16

MA 4-20

MAINTENANCE

| ↑

| |

▲| |▼

| |

↓ |

SET 17

BK LIGHT

MAINTENANCE

| ↑

▲| |▼

↓ |

SET 18

ETHERNET

MAINTENANCE

▲↓ ↑▼

⇔

SET

⇔

SET

⇔

SET

2.5mA

MNT OUT

MAINTENANCE

▲↓↑▼

4.0mA

MNT OUT

MAINTENANCE

▲↓↑▼

HOLD

MNT OUT

MAINTENANCE

▲↓↑▼

4-20mA

MNT OUT

MAINTENANCE

100%

4MA ADJ

MAINTENANCE

↓

100%

20MA ADJ

MAINTENANCE

BK LIGHT

MAINTENANCE

▲↓↑▼

SAVE

BK LIGHT

MAINTENANCE

GD-70D - 58 -

Page 59

7 Regular Maintenance Mode

SET 19.PUMP CK

Set the pump drive level diagnosis. Select either ON/OFF, and then press the SET key to confirm the selection. When ON is selected, the message "FLOW" is displayed if the flow rate is sufficient even though the pump drive level is low. (A function to check the conditions for applying pressure, etc.)

● ○ ○ ○

SET 19

PUMP CK

MAINTENANCE

| ↑

▲| |▼

↓ |

SET 0. ADDRESS

⇔

SET

PUMP CK

MAINTENANCE

▲↓↑▼

OFF

PUMP CK

MAINTENANCE

- 59 - GD-70D

Page 60

7 Regular Maintenance Mode

Date/Time Setting

SET 1.DAY TIME

Press the SET key.

PW A1 A2 F LCD

● ○ ○ ○

SET 1

DAY TIME

MAINTENANCE

↓

Date/Time Setting Display

Press the SET key.

● ○ ○ ○

↓

12:00

2009.01.01

MAINTENANCE

Year Setting

Select the number by pressing the ▲ or ▼ key, and then press the SET key to confirm the value.

Month Setting

Select the number by pressing the ▲ or ▼ key, and then press the SET key to confirm the value.

Date Setting

Select the number by pressing the ▲ or ▼ key, and then press the SET key to confirm the value.

Hour Setting

Select the number by pressing the ▲ or ▼ key, and then press the SET key to confirm the value.

Minute Setting

Select the number by pressing the ▲ or ▼ key, and then press the SET key to confirm the value.

● ○ ○ ○

↓