RKI Instruments PLU-70 User manual

PT9E-0070

Pyrolyzer Unit

(for GD-70D Series)

PLU-70

Operating Manual

Request for the Customers

• Read and understand this operating manual before using the pyrolyzer unit.

• You must operate the pyrolyzer unit 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 unit, a regular maintenance for every six months and daily

maintenance must be performed.

• If you find abnormalities in the pyrolyzer unit, please notify them to our local representative

immediately.

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Preface

Preface

Thank you for choosing the pyrolyzer unit PLU-70 designed for dedicated use with our gas detector head
GD-70D series. Please check that the model number of the product you purchased is included in the
specifications on this manual.

This pyrolyzer unit is designed for dedicated use with the gas detector head GD-70D series and must be
used in combination with the GD-70D series as the base unit.
This operating manual explains how to use the pyrolyzer unit PLU-70 installed on the gas detector head.
The basic operating procedures conform to those of the base unit, GD-70D series. This operating manual is
intended as a complement to the GD-70D series operating manual.
For proper use of the pyrolyzer unit, please read and thoroughly understand both this operating manual and
the GD-70D series operating manual before use.

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<Contents>

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

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

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

1-1. Product components................................................................................................ 6

1-2. Product specifications.............................................................................................. 7

1-3. List of accessories................................................................................................... 7

1-4. Names and functions for each part.......................................................................... 8

1-5. Block diagram.......................................................................................................... 10

2. Installation ............................................................................................................... 11

2-1. Requirements .......................................................................................................... 11

2-2. Installation of pyrolyzer unit..................................................................................... 12

2-3. How to wire.............................................................................................................. 16

2-4. How to tube ............................................................................................................. 18

2-5. Relocate .................................................................................................................. 19

2-6. Disposal................................................................................................................... 19

3. How to Operate ....................................................................................................... 20

3-1. Preparation for start-up............................................................................................ 20

3-2. How to start the pyrolyzer unit ................................................................................. 20

3-3. How to exit............................................................................................................... 21

4. Regular Maintenance Mode .................................................................................... 22

5. Maintenance............................................................................................................ 24

5-1. Gas calibration method............................................................................................ 24

5-2. Other adjustments/Cleaning method ....................................................................... 25

5-3. How to replace parts................................................................................................ 25

5-4. Procedures to store the pyrolyzer unit or leave it for a long time............................. 25

6. Troubleshooting....................................................................................................... 26

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Important Notices on Safety

Important Notices on Safety

<Definition of DANGER, WARNING, CAUTION, and NOTE>

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 Cases>

DANGER

This is not an explosion-proof unit. You must not use it to detect gases exceeding the lower explosive limit (LEL).

<Warning Cases>

WARNING

Power Supply

Before turning on the pyrolyzer unit, always check that 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 inside or outside the pyrolyzer unit or disconnect the wire from the grounding
terminal.

Tubing

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

Operation in a gas

Do not operate the pyrolyzer unit in a place where combustible gases or vapors are present. Operating the
pyrolyzer unit in such an environment will lead to extreme dangers.

Pyrolyzer heater (pyrolyzer)

The pyrolyzer heater becomes hot. Do not touch the pyrolyzer heater because your hands may be burnt. Do not
touch the pyrolyzer heater just after power-off because it is still hot.

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Important Notices on Safety

<Precautions>

CAUTION

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

Radio wave from a transceiver near the pyrolyzer unit or its cables may affect reading. When using a transceiver,
it must be used in a place where it disturbs nothing.

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

Restarting the pyrolyzer unit within five seconds may cause errors.

Attach the dust filter before using the pyrolyzer unit.

Before using the pyrolyzer unit, attach the specified filter to prevent disturbances by possible gas adsorption or air
dust.
A dust filter to be used 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 may 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 dissolved 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 disassemble/modify the pyrolyzer unit, or change the settings if not necessary.

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

Do not forget to perform a regular maintenance.

Since this is a safety unit, a regular maintenance must be performed to ensure its safety. Continuing to use the
pyrolyzer unit 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

1

Overview

1-1. Product components

<Pyrolyzer Unit (PLU-70)>

<Standard Accessories>

• Operating manual

• Protective rubber cap (to be removed when using the

pyrolyzer unit)

• Dedicated handling lever (for wiring)

• Dedicated U-tube

<Gas Detector Head GD-70D Series (Base Unit: Option)>

* This pyrolyzer unit is designed for dedicated use with the gas

detector head GD-70D series. Use the pyrolyzer only after
installation on the base unit, GD-70D series.

Gas detector head

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1 Overview 1-2. Product specifications

1-2. Product specifications

Power Display POWER lamp on (green)
Recommended
Power Cable
Power Supply
Power
consumption
Tube Connecting
Hole
Operating
temperature
Operating humidity 30-80%RH (Non-condensing)
Structure Box type/Wall mounted type
External
Dimensions
Weight Approx. 0.9 kg
Outer Color PLU main unit: grey

Cable of CVV, etc.(1.25sq) - 2-core

24VDC ±10%
Max. 25 W

Rc1/4 (O.D Φ6-1t half-union for Teflon tube<PP>supplied)

0-40°C (at a constant condition)

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

Front door: white

1-3. List of accessories

• Operating manual

• Protective rubber cap

• Dedicated handling lever

• Dedicated U-tube

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

1-4. Names and functions for each part

<Appearance>

M5 mounting hole

Screw for grounding earth rod

External wire hole

Connector for PoE

GD-70D connecting cable

GAS OUT

Fan exhaust hole

GAS IN

Protective cover for power switch

Power switch

GD-70D connecting tube

Power lamp

(Unit: mm)

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

<Components of the Pyrolyzer Unit>

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

Lock lever

For tubing to the gas detector head

Power lamp

PLU main unit

Inside the PLU main unit

(with the front cover open)

Fan

Pyrolyzer heater

GAS IN

<Wall-mounted Unit>

Mounting hole: A hole for wall-mount.

Terminal plate: A power terminal (2P).

Lock lever: A lever to lock the PLU main unit.

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1 Overview 1-5. Block diagram

1-5. Block diagram

<Electric Diagram>

(Pyrolyzer heater)

Pyrolyzer

PL-70

Power supply circuit

Power supply part

POWER INPUT(DC:24V)

Controller

(CPU)

Flow Sensor 1
Total flow rate

Flow Sensor 2

Bypass flow rate

Display

(POWER lamp)

Fan

<Tubing Diagram>

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2 Installation 2-1. Requirements

2

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 pyrolyzer unit, resulting in inaccurate gas detection.

CAUTION

• After you receive the pyrolyzer unit, start using the pyrolyzer immediately.

<Precautions for Installation Sites>

CAUTION

• Install the pyrolyzer unit near the base unit, gas detector head GD-70D series. Since the pyrolyzer
unit is a precision device like the gas detector head, the precautions for installation sites shall conform
to those of the gas detector head. (See the operating manual for the GD-70D series.)

< Precautions for System Designing >

CAUTION

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

• The designing of a system using the pyrolyzer unit must reflect the contents of the operating manual

of the base unit, gas detector head GD-70D series, and the descriptions in this section.

Using a stable power supply

The pyrolyzer unit must be provided with the following power supply.

Power supply voltage

Allowed time of
momentary blackout

Others

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24 VDC
Up to 10 millisecond

(To recover from the momentary blackout for 10 milliseconds or more, restart the
pyrolyzer unit.)

To ensure continuous operation and activation, install a UPS outside the pyrolyzer unit.
Do not use it with a power supply of large power load or high-frequency noise.

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

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±10% (the terminal voltage of the pyrolyzer unit)

2 Installation 2-2. Installation of pyrolyzer unit

py

Heat radiation designing

• Do not block the ventilation holes when you install the pyrolyzer unit on or under the gas detector head.
It is recommended that installation points of the sets should be away from each other for 10 mm or more.
Intervals between installation points must be at least 5 mm.

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

CAUTION

• When the internal temperature of the pyrolyzer unit reaches about 60°C, a trouble alarm is issued
by the gas detector head, resulting in a halt of the pyrolyzer heater. Since the internal
temperature rises to ten-odd degrees higher than the ambient temperature, take care not to let
the ambient temperature exceed 40°C. Provide a clearance of 30 mm or more above the

rolyzer unit to prevent a rise in the internal temperature.

2-2. Installation of pyrolyzer unit

CAUTION

• Install the pyrolyzer unit near the base unit, gas detector head GD-70D series. See the
descriptions in this section and the gas detector head GD-70D series operating manual before
carrying out installation.

• Before installing the pyrolyzer unit, remove the protective rubber caps from GAS IN and GAS
OUT. If the pyrolyzer unit 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.

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2 Installation 2-2. Installation of pyrolyzer unit

<Install Dimension and Maintenance Space>

(170)

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

Maintenance space

PLU-70

(Left)

Maintenance space

Gas detector

head

(Right)

CAUTION

• The installation points of the pyrolyzer unit PLU-70 and the gas detector head GD-70D series
should be away from each other for 80 ±5 mm (with a clearance of 5 to 15 mm).
It is recommended that installation points of the sets should be away from each other for 10 mm
or more. Intervals between installation points must be at least 5 mm.

• The PLU-70 must be installed on the LEFT of the gas detector head GD-70D series.

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

(300)

(30)

(150)

Maintenance space

Maintenance space

PLU-70

(Left)

Maintenance space Maintenance space

Gas detector

head

(Right)

(Unit: mm)

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2 Installation 2-2. Installation of pyrolyzer unit

<Installation of Wall-mounted Unit>

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

Recommended mounting screw
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 PLU main unit on 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 may invite unnecessary vibrations and noises.

<Detaching and Attaching PLU Main Unit>

Attaching PLU Main Unit

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

When pressing the PLU main
unit, align the side mark with the
hook of the wall-mounted unit for
smooth installation.

Make sure that the top of the
wall-mounted unit is above the
PLU main unit.

10mm

The lock clicks.

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2 Installation 2-2. Installation of pyrolyzer unit

Detaching PLU Main Unit

While pushing the sky blue lever toward the wall-mounted unit,
hold up the PLU main unit.
If you cannot move the PLU 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-mounted unit.

CAUTION

• Be careful not to drop the PLU main unit when
detaching it. Also, check the secure installation of the
PLU main unit after attaching it to the wall-mounted
unit. If the PLU 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
PLU main unit.

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2 Installation 2-3. How to wire

2-3. How to wire

CAUTION

• Be careful not to mistake the wall-mounted unit of the pyrolyzer unit with that of the gas detector head
GD-70D series because they have different numbers of terminals (2P for the PLU-70 and 10P for the
gas detector head).

• Install wiring for the pyrolyzer unit in the same way as for the gas detector head. For "Specifications of
Terminal Plate," "How to Connect to Terminal Plate," "How to Clamp Cables," and "Grounding," see
the operating manual of the gas detector head GD-70D series and install wiring accordingly.

<Figure of Terminal Plate>

1 2

+ -

24VDC

Use the dedicated
handling lever.

<Connecting to the Gas Detector Head>

Connect the PLU-70 and the gas detector head using a dedicated communication cable extending from the PLU-70.

• Install the PLU-70 on the left and the gas detector head on
the right when viewed from the front.

• Before making the connection, ensure that the PLU
communication connector on the gas detector head is ready
for use.

• The dedicated communication connector is a lock type.
Check that the connector is firmly locked when you attach it.
Unlock the connector before you detach it.

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Insert the dedicated
communication cable
into the connector of
the gas detector head.

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Dedicated
communication cable

Left side

PLU-70

Right side
Gas detector head
GD-70D

<Communication Cable Connector>

Lock

2 Installation 2-3. How to wire

CAUTION

• Do not hang the communication cable.

• The communication cable connector has a lock feature. Unlock the connector before you detach it.

Pulling out a locked connector may result in a trouble such as breaking of the wire.

NOTE

<Use of the PLU Communication Connector on the Gas Detector Head GD-70D Series>

• Insert a small flathead screwdriver into a gap where the lug of the communication connector cover is
protruding, and pull it up in the direction of an arrow in the figure to remove it. Be careful not to damage the
connector pins inside by pushing in the flathead driver.

• The communication connector cover is a one-piece component of covers for a dedicated communication
cable for the PLU and a LAN cable. Since the cover can be easily split, use it in a way that suits your needs.
Keep the cover attached to the connector while it is not connected.

• When you attach the cover, first fit the lug to the gas detector head base unit and then push in the cover.

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2 Installation 2-4. How to tube

)

(

)

2-4. How to tube

CAUTION

• Install tubes between the pyrolyzer unit and the gas detector head GD-70D series, putting the
pyrolyzer unit in front of the gas detector head.

• Like the gas detector head, the pyrolyzer unit has a Rc1/4 thread inside of the sampling
inlet/outlet (GAS IN, GAS OUT), to which polypropylene unions are normally attached. Connect
the tubes basically in the same way as for the gas detector head. (See the operating manual for
the GD-70D series.

<Connecting to the Gas Detector Head>

To use the gas detector head GD-70D series and the pyrolyzer unit PLU-70 in combination, install tubes to
realize a flow in the following direction:
GAS IN -> PLU-70 -> Gas detector head GD-70D series -> GAS OUT
. Please use the dedicated U-tube supplied with the pyrolyzer to connect between the PLU-70 and the gas
detector head (between the PLU-70 OUT and the gas detector head IN).

CAUTION

• Making incorrect tube connections may result in inaccurate gas detection. Double-check the tube

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connections for errors.
No error message is displayed in particular even if the dedicated U-tube is connected incorrectly
(i.e., from the gas detector head to the PLU-70).

• Use the dedicated U-tube supplied with the pyrolyzer unit to connect between the PLU-70 and
the gas detector head. Using other components invalidates the warranty of the performance.

Bottom

GAS IN

Left side

PLU-70

From the PLU-70 to the gas detector head

Dedicated flow path

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GAS OUT

Right side
Gas detector head

2 Installation 2-5. Relocate

2-5. Relocate

When the pyrolyzer unit is relocated, select a new place in accordance with "Precautions for installation
site" and "2-2. Installation of pyrolyzer unit".
For information on wiring and tubing, see "2-3. How to wire" and "2-4. How to tube". The unpowered time
must be minimized when the pyrolyzer unit 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.

2-6. Disposal

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

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

3

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 pyrolyzer unit.

• Check that the pyrolyzer unit and the base unit, gas detector head GD-70D, are connected properly (using
dedicated cables and tubes).

• Connect the pyrolyzer unit to a grounding circuit.

• Check that the wiring (power supply wiring) is connected to external power source properly.

• Check that the power supply voltage is compliant with the specifications.

• Check that the dust filter is attached properly.

3-2. How to start the pyrolyzer unit

• Before turning on the power switch, check that the pyrolyzer unit
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.
The power lamp blinks (and starts to stay lit in an hour).

• First turn on the power switch of the pyrolyzer unit PLU-70, and
then turn on the power of the base unit, gas detector head
GD-70D series. Check that the gas detector head enters the
initial clear status and has been started.

• During the start-up procedure, check that the pyrolyzer unit
connection indicator appears on the LCD display of the gas
detector head.

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When the switch cover
is closed

When the switch cover
is open

OFF ON

Pyrolyzer unit connection indicator

3 How to Operate 3-3. How to exit

<Start-up Procedures (Gas Detector Head)>

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

● ○ ○ ○

● ○ ○ ○

↓

30.0ppm

NF3

↓

0.0ppm

NF3

NOTE

Conduct the operation procedures after start-up using the base unit, gas detector head. For specific
operation procedures, see the operating manual of the gas detector head GD-70D series.

CAUTION

• The pyrolyzer unit must be warmed up until the pyrolyzer reaches a specified temperature and is
stabilized.
Warm up the pyrolyzer unit for about one hour when you use it for the first time or have not used
it for a long period (The power lamp on the pyrolyzer unit blinks for one hour after power-on).

• Additionally, the gas detector head (sensor unit) also must be warmed up. Warm up the gas
detector head at the same time as the pyrolyzer unit.
(See the operating manual for the GD-70D series.)

3-3. How to exit

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

WARNING

• To turn off the pyrolyzer unit, first turn off the power of the base unit, gas detector head GD-70D

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series, in a reverse procedure to turning on the pyrolyzer unit. (See the operating manual for the
GD-70D series.)

• If you turn off the pyrolyzer unit before the gas detector head, a trouble alarm (pyrolyzer
abnormalities) is issued.

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4 Regular Maintenance Mode

4

Regular Maintenance Mode

You can check the data (parameters) of the pyrolyzer unit using the menu in the maintenance mode of the
gas detector head. The data is displayed on the LCD of the gas detector head.

<Pyrolyzer Heater Data Display "2-11">

Maintenance Mode (Operation on the Gas Detector Head)

PW A1 A2 F LCD

User Mode

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

↓

Regular Maintenance
Mode

2-11.PL DATA

In “2-11. PL DATA”, press the
SET key.

↓

PL-0.PL TEMP

Show the temperature of the
pyrolyzer unit.

PL-1.PL FLOW

Show the present flow rate in
the pyrolyzer heater (PL-70).
(Specified flow rate = 0.3L/min)

PL-2.PL H.TEMP

Show the setting
temperature of the pyrolyzer
heater (PL-70).

● ○ ○ ○

● ○ ○ ○

● ○ ○ ○

● ○ ○ ○

● ○ ○ ○

1- 8

M MODE

MAINTENANCE

↓

2-11

PL DATA

MAINTENANCE

↓

PL- 0

PL TEMP

MAINTENANCE

▲

↓ ↑▼

PL- 1

PL FLOW

MAINTENANCE

▲

↓ ↑▼

PL- 2

PL H.TEMP

MAINTENANCE

↓ ↑▼

▲

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

→

SET

PL TEMP

MAINTENANCE

→

SET

MAINTENANCE

→

SET

PL H.TEMP

MAINTENANCE

●: Lamp on
○: Lamp off

25.0°C

0.30

L/M

800°C

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4 Regular Maintenance Mode

PL-3.PL POW

Show the present electric
power of the pyrolyzer
heater (PL-70).

PL-4.PL VOLT

Show the present voltage of
the pyrolyzer heater (PL-70).

PL-5.PL CUR

Show the present current of
the pyrolyzer heater (PL-70).

PL-6.PL 3.3V

This is internal information of
the pyrolyzer unit. Used for
diagnosis of abnormalities, etc.

PL-7.PL 5.0V

This is internal information of
the pyrolyzer unit. Used for
diagnosis of abnormalities, etc.

PL-8.PL VER

Show the program version of
the pyrolyzer unit.

PL-9.PL F AD1

This is internal information of
the pyrolyzer unit. Used for
diagnosis of abnormalities, etc.

PL-10. PL F AD2

This is internal information of
the pyrolyzer unit. Used for
diagnosis of abnormalities, etc.

● ○ ○ ○

● ○ ○ ○

● ○ ○ ○

● ○ ○ ○

● ○ ○ ○

● ○ ○ ○

● ○ ○ ○

● ○ ○ ○

▲

↓ ↑▼

PL- 3

PL POW

MAINTENANCE

▲

↓ ↑▼

PL- 4

PL VOLT

MAINTENANCE

▲

↓ ↑▼

PL- 5

PL CUR

MAINTENANCE

▲

↓ ↑▼

PL- 6

PL 3.3V

MAINTENANCE

▲

↓ ↑▼

PL- 7

PL 5.0V

MAINTENANCE

▲

↓ ↑▼

PL- 8

PL VER

MAINTENANCE

▲

↓ ↑▼

PL- 9

PL F AD1

MAINTENANCE

▲

↓ ↑▼

PL-10

PL F AD2

MAINTENANCE

▲

↓ ↑▼

To P L - 0.P L TEMP

→

SET

14725

PL POW

MAINTENANCE

→

SET

9500mV

PL VOLT

MAINTENANCE

→

SET

1550mA

PL CUR

MAINTENANCE

→

01234

SET

56AB

MAINTENANCE

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5 Maintenance 5-1. Gas calibration method

5

Maintenance

The pyrolyzer unit should be used in combination with the base unit, gas detector head GD-70D series. The
pyrolyzer unit is an important instrument for the purpose of safety as the gas detector head. To maintain the
performance of the pyrolyzer unit and improve the reliability of safety, perform a regular maintenance on it
as well as the gas detector head. For maintenance procedures, see the operating manual of the gas
detector head GD-70D series.

5-1. Gas calibration method

Perform a gas calibration in the maintenance mode (zero
adjustment mode and span adjustment mode) of the gas detector
head using the calibration gas.

• Zero adjustment gas (collected in a gas sampling bag)

• Span adjustment gas (collected in a gas sampling bag)

• Gas sampling bags

Calibration
gas

GAS IN

GAS OUT

NOTE

For specific operation procedures in the zero adjustment mode and the span adjustment mode, see the
operating manual of the gas detector head GD-70D series.

Exhaust
gas

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5 Maintenance 5-2. Other adjustments/Cleaning method

5-2. Other adjustments/Cleaning method

<Cleaning of Detector>

Clean the pyrolyzer unit if it becomes extremely dirty. The pyrolyzer unit must be turned off while cleaning it.
Use a waste cloth to remove dust. Do not use water or organic solvent for cleaning because they may
cause malfunctions.
Because an extremely large amount of dust inside the tube may disturb the gas detection, it must be
cleaned with dry AIR, etc.

5-3. How to replace parts

<Replacement of Regular Replacement Parts>

List of recommended regular replacement parts

No. Item Maintenance

intervals
1 Flow sensor 1 year 5 year 2
2 Fan 0.5 years 2 - 4 years 1
3 Pyrolyzer

heater

- 2 - 4 years 1

NOTE

• The above replacement intervals are recommendation only. The intervals may change depending on the
operating conditions. These intervals do not mean the warranty periods either. The result of the regular
maintenance may determine when to replace the parts.

• Replace the elbow at the same time as replacing the pyrolyzer heater.

Replacement of Flow Sensor, Fan, and Pyrolyzer Heater

After the flow sensor, fan, or pyrolyzer heater is replaced, the operation must be checked by a qualified
service engineer.
For the stable operation of the pyrolyzer unit and safety, ask a qualified service engineer to take care of
replacement of the parts that operation must be checked. Please contact our sales department.

Replacement

intervals

Quantity

(pieces/unit)

5-4. Procedures to store the pyrolyzer unit or leave it

for a long time

The pyrolyzer unit must be stored under the following environmental conditions.

• In a dark place under the normal temperature and humidity away from direct sunlight

• In a place where gases, solvents or vapors are not present

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.

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6 Troubleshooting

6

Troubleshooting

The troubleshooting does not explain the causes of all the malfunctions which occur on the pyrolyzer unit.
This simply helps to find the causes of malfunctions which frequently occur. If the pyrolyzer unit shows a
symptom which is not explained in this manual, or still has malfunctions even though remedial actions are
taken, please contact our sales department.

CAUTION

This section describes troubleshooting on the pyrolyzer unit PLU-70. For information on general
troubleshooting on the base unit, gas detector head, see the operating manual of the gas detector head
GD-70D series.

<Pyrolyzer Unit Abnormalities>

Symptom Causes Actions

Impossible Power ON

Abnormal Operations

Pyrolyzer
Abnormalities

<<On the Gas Detector
Head>>

- E-7 PL UNIT
displayed

- FAULT lamp on

The power switch is turned off. Turn ON the power switch.
Abnormalities/momentary

blackout of power supply
system

Improper installation of the
PLU main unit

Cable abnormalities (open
circuit/not connected/short
circuit)

Disturbances by sudden surge
noise, etc.

PLU-70 power is not turned on. Turn ON the power switch.
The dedicated communication
cable to the gas detector head
is not connected or improperly
connected.
Abnormalities inside the
pyrolyzer heater such as
abnormal overheating of the
pyrolyzer heater or stop of the
fan
(Rapid blinking of the pyrolyzer
unit power lamp).
The dedicated communication
cable has been connected by
mistake to a gas detector head
that does not need the PLU-70
as per its specifications.

Provide the rated voltage.
Check the UPS, power supply line filter and insulation

transformer, and then take additional measures.
Check that the PLU main unit is properly attached to the

wall-mounted unit.
Check the wiring of detector and related devices around

it.

Turn off and restart the pyrolyzer unit.
If such a symptom is observed frequently, take

appropriate measures to eliminate the noise.

Check that the dedicated communication cable is
connected and the cable connector is securely fastened.

Check that nothing is hanging on the pyrolyzer fan and
that no foreign matter has got stuck in the fan. If it gets
hot inside a closed panel, install a fan on the panel itself
or take other necessary measure for heat dissipation.
In the case of a pyrolyzer heater or fan failure, please
contact our sales department because parts replacement
is required.
Reconnect the cable to a gas detector head that needs
the PLU as per its specifications (such as NF3).

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6 Troubleshooting

Symptom Causes Actions

A sensor unit that does not
need the PLU-70 as per its
specifications has been
installed by mistake.

Replace the sensor unit installed on the gas detector
head with a sensor unit that needs the PLU (such as
NF3).

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Warranty Policy

RIKEN KEIKI CO., LTD., warrants gas alarm equipment sold by us to be free from defects in materials,
workmanship, and performance for a period of one year from date of shipment from RIKEN KEIKI CO., LTD.,
Inc. Any parts found defective within that period will be repaired or replaced, at our option, free of charge.
This warranty does not apply to those items which by their nature are subject to deterioration or
consumption in normal service, and which must be cleaned, repaired, or replaced on a routine basis.

Warranty is voided by abuse including mechanical damage, alteration, rough handling, or repair procedures
not in accordance with the operator’s manual. This warranty indicates the full extent of our liability, and we
are not responsible for removal or replacement costs, local repair costs, transportation costs, or contingent
expenses incurred without our prior approval.

THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER WARRANTIES AND
REPRESENTATIONS, EXPRESSED OR IMPLIED, AND ALL OTHER OBLIGATIONS OR LIABILITIES
ON THE PART OF RIKEN KEIKI CO., LTD., INCLUDING BUT NOT LIMITED TO, THE WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL RIKEN
KEIKI CO., LTD., BE LIABLE FOR INDIRECT, INCIDENTAL, OR CONSEQUENTIAL LOSS OR
DAMAGE OF ANY KIND CONNECTED WITH THE USE OF ITS PRODUCTS OR FAILURE OF ITS
PRODUCTS TO FUNCTION OR OPERATE PROPERLY.

This warranty covers instruments and parts sold to users by authorized distributors, dealers, and
representatives as appointed by RIKEN KEIKI CO., LTD.

We do not assume indemnification for any accident or damage caused by the operation of this gas monitor,
and our warranty is limited to the replacement of parts or our complete goods.

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