RKI Instruments GD-70D User Manual

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

 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 -



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

- 3 - GD-70

 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.

GD-70 - 4 -

 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.

- 5 - GD-70D

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)

GD-70 - 6 -

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)

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)

GD-70D - 8 -

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)

- 9 - GD-70D

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 -

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.

- 11 - GD-70D

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 -

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

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 -

1 Overview 1-6. Block diagram

- 15 - GD-70D

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 -

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

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 -

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

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 -

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

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 -

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

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 -

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

+ 56 hidden pages

RKI Instruments GD-70D User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual