vetus PD1000 Gas Detector Instruction Manual

Installation and user manual
Gas detector – Petrol vapour and CO Gas detector
Petrol vapour and CO
PD1000

Safety advice

Read this manual carefully before taking the gas detector into service and follow the user instructions.
Also make sure that other people on board are aware of the safety advice.
As soon as the gas detector detects the presence of gas:

• Never switch on any electrical equipment!
• No heat, sparks or naked flames!
• Ventilate the compartment!

Warning
This product should only be installed and maintained by qualified personnel who have read and understood the instructions and precautions in this manual Failure to follow the instructions in this manual may result in serious injury or  property damage The manufacturer shall not be liable for any damages resulting from improper installation or maintenance by unqualified personnel

Warning
This product should only be operated by persons who have read and understood the instructions and precautions in this manual Failure to follow the instructions in this manual may result in serious injury or property damage The  manufacturer shall not be liable for any damages resulting from improper operation

Introduction

The VETUS gas detector together with one or two sensors forms a gas detection system with two different functions.
In the first place for the detection of petrol vapour to prevent the risk of an explosion in the engine room.
Secondly to detect the poisonous gas carbon monoxide (CO) *) to prevent the formation of a dangerous and poisonous atmosphere for people.
The danger formed by carbon monoxide is dependent on a time-weighted average. This means that it is dependent on both the concentration of carbon monoxide and the time that the carbon monoxide is present.
The concentration of carbon monoxide therefore has influence on the time before the gas detector gives an alarm.
Both detector functions are carried out at the same time.

• Carbon monoxide (chemical formula CO) is an invisible, colourless and odourless gas. It is formed by incomplete combustion in equipment burning organic fuels such as oil, gas, petrol, coal and wood (so not in electrical installations!).  Incomplete combustion means that there is insufficient oxygen present to allow good or complete combustion.

When carbon monoxide is breathed in it is taken up by the blood via the lungs and attaches itself to the red blood cells. Red blood cells transport oxygen through the body.
Because carbon monoxide attaches to red blood cells about 200x more easily than oxygen it can very easily displace oxygen from the blood and this can therefore transport less oxygen.
The gas detector can be connected to a 12 Volt or a 24 Volt direct current power supply.
The gas detector can be used in either continuous or intermittent mode according to choice, see 3.2.
It is recommended that the possible presence of petrol vapour and carbon monoxide should always be checked; even when the ship is not in use!
Therefore, always keep the power supply to the gas detector switched on

Severe contamination and high concentration of moisture reduce the lifetime of the sensors significantly. Poisoning of the sensors occurs if they are exposed to silicone vapour and solvents, (painting work), freons (old cooling systems) or vapour from leaded petrol and polyester resins while they are switched on.
In order to prevent damage to the sensors it is recommended that the gas detector is switched off under the conditions named above or even to remove the sensors from the ship temporarily.
N B The presence of petrol vapour and CO will then no longer be detected Do not forget to consider safety!
The sensor ages while being used to measure the concentration, and this is faster during continuous than during intermittent use. After about 2 years of continuous use the sensor will have aged, see ‘4 Ageing of the sensor’.

2 1 Contents of the pack
1 Instrument PD1000
1 Sensor
1 Cable for connecting sensor (5 metres)
2 Screws for fitting the sensor
1 Manual

Operating

3 1 Switching on and off
Switching on: Briefly press the button once.
Switching off: Press the button and hold down for 5 seconds.
After switching on the gas detector will check for the presence of gas continuously.
The LED above the button will come on. This LED will flash if the battery voltage is too low.
The gas detector is switched on automatically when the power supply is switched on. This is to prevent you from forgetting to switch it on.

The sensor will have warmed up after about 1 minute and the gas detector can then detect the presence of gas reliably A test is carried out while the sensor is warming up to see if a sensor is connected and if it is functioning correctly.

3.2 Continuous or intermittent check for the presence of gas
The gas detector can be used to check for the presence of gas in either continuous or intermittent mode according to choice.
The gas sensors are switched on for 1 minute and then off for 2 minutes when in intermittent mode.
The average power consumption is lower in this mode than when used continuously.
The gas detector is set standard to continuous mode.
Changing from continuous mode to intermittent mode or vice versa is done by pressing the CONT button. The green LED above the CONT button is on when in continuous mode.
If the fuel shut off valve is opened the gas detector is automatically set to continuous mode, see 3.7.
Use continuous mode when people are on board.
Use intermittent mode when you are not on board the ship.

3 3 Testing
The working of the gas detector can be tested by activating the test cycle. A false alarm is given for 7 seconds after pressing the TEST button. The following are tested during this false alarm:

• the working of the sensors
• the working of the acoustic alarm
• the correct functioning of the operation of the fuel shut off valve and the fan; the fuel shut off valve is closed and the fan switched on.

The gas detector checks continuously that the sensor or sensors are connected and functioning correctly. An alarm is given if this is not the case.

3 4 Indicating the measured gas concentration (Alarm or safe)
Whether petrol vapour and/or carbon monoxide has been detected by the sensor and/or whether the sensor is functioning properly is indicated by an acoustic alarm and two LEDs, one for each sensor

The indication is as follows:

| Safe| No combustible gas or CO has been detected.
---|---|---
| Warning CO| A minimum amount of CO has been detected, but less than the alarm level. This is in the warning range.
| Warning Petrol vapour| A minimal amount of petrol vapour has been detected, but less than the alarm level. This is the warning range.
| Alarm CO| An amount of CO higher than the alarm level has been detected.
| Alarm Petrol vapour| An amount of petrol vapour high-er than the alarm level has been detected.
| Attention| The sensor is faulty or aged.

NB: if no sensors are connected to the gas detector it cannot function. Both LEDs will flash RED until at least 1 sensor has been detected.

3.5 Switching off the acoustic alarm
If there is an alarm situation the acoustic alarm (buzzer) can be switched off by pressing the button.
If the alarm situation still exists 5 minutes after the button has been pressed the acoustic alarm will be switched on again.
3.6 Fan
Use the button to switch the fan on and off. When the fan is switched on the green LED above the button will be on. This LED will flash if the battery voltage is too low.
The fan is switched on automatically if there is an alarm situation
3.7 Fuel valve
Use the button to open or close the fuel valve. When the fuel shut off valve is open the green LED above the button will be on. This LED will flash if the battery voltage is too low.
If the fuel shut off valve is opened the gas detector is automatically set to continuous mode.
If there is an alarm situation as a result of too high a concentration of petrol vapours or too high a concentration of CO the fuel shut off valve will be closed automatically.

Ageing of the sensor

The sensor ages when it is used for measuring. The extent of the ageing is monitored by the gas detector. After about 2 years continuous use the sensor is aged and the gas detector will give a warning.
The LED of the corresponding sensor on the panel will flash red and the red LED on the particular sensor will also come on.
The buzzer will also give the attention signal. A sensor that has aged must be replaced.
4 1 Replacing the sensor
Fit and connect a new sensor. The LED for the particular panel on the panel will continue to flash red.
After replacing the sensor this must be made known to the gas detector after which it will monitor the ageing in the correct way again. Follow the instructions below to do this.

• Switch off the gas detector using the button.
• Replace the sensor.
• Switch on the gas detector again using the button.
• Press and hold down the button. Now also press the button for the particular sensor.
  Sensor 1: button + TEST button
  Sensor 2: button + button

Keep both buttons pressed in for 10 sec
A sound will be heard after this to indicate that the ageing clock has been reset to 0. Release both buttons. The corresponding LED will come on green as soon as the new sensor has been detected and is functioning correctly.
The sensor will have warmed up after about 1 minute and the gas detector can then detect the presence of gas reliably

NB
The sensor is a consumable and is not covered by warranty
Only carry out these actions for the sensor that is being replaced and not for any other existing sensor for which the life cycle is still being monitored, otherwise the ageing of this will no longer be interpreted correctly This could lead to  dangerous situations occurring

Installing

5.1 Control panel
For dimensions see ‘7 Overall dimensions’.
The panel is for fitting inside!
Use a hole cutter to cut a hole diameter 76 mm (3”) in the instrument panel or in a bulkhead.
Fit the panel in the hole using the spring clamps supplied. If the back of the panel will not be easily accessible all connections should be made first before positioning the panel in the hole.
5.2 Sensors
One or two sensors may be connected to the gas detector as desired. The sensor must be positioned in the right place in the room in which a concentration of gas could arise.
5.2.1 Selecting the right place for the sensor
The sensor detects both petrol vapour and carbon monoxide (CO).
Petrol vapour is denser than air and must be detected as low as possible.
Carbon monoxide is less dense than air and must be detected as high as possible.
Naturally, it is possible that both gases that are denser than air and less dense than air can occur in an engine room.
All rooms for which this is important must naturally be well ventilated.
The sensor may be positioned at any angle.
The position of the sensor must be chosen so that it will always be out of the bilge water!
5.2.2 Installing a 2nd sensor
If a second sensor is fitted later after originally only positioning one sensor during the installation of the gas detector the presence of the 2nd sensor will automatically be detected by the gas detector.
In order to measure the concentration of gas reliably the sensor must warm up for 1 minute after this

5.3 Connections
Connect the gas detector as shown in ‘8 Wiring diagram’.
5.3.1 Power supply
The gas detector is suitable for both 12 and 24 Volt.
The fuse in the plus wire of the gas detector only protects the gas detector itself and does not protect any fuel valve, alarm or fan connected!
5.3.2 Fuel shut off valve
An electrically operated shut off valve can be connected to the output ‘VALVE’. The shut off valve can be included in the fuel supply line to the engine, for example. In the event of an alarm situation the shut off valve will be closed  automatically so shutting off the fuel supply to the installation.
The fuel shut off valve must operate at the same voltage as the power supply to the installation, either 12 or 24 volt direct current respectively.
The output ‘VALVE’ is suitable for a fuel shut off valve requiring a current of maximum 1 A.
Fit a 1 A fuse in the plus wire to the fuel valve.
NB: the gas detector switches the minus connection (-, earth) to the fuel valve!
5 3 3 External Alarm
An external alarm (for example, a hooter or buzzer) or a contact for an alarm system can be connected to the output ‘ALARM’.
If there is an alarm situation the external alarm will be switched on automatically.
The external alarm (hooter or buzzer) must operate at the same voltage as the power supply to the installation, either 12 or 24 volt direct current respectively.
The output ‘ALARM’ is suitable for a hooter or buzzer requiring a current of maximum 1 A. Fit a 1 A fuse in the plus wire to the hooter or buzzer. NB: the gas detector switches the minus connection (-, earth) to the hooter or buzzer!
5 3 4 Ventilator
An electric fan can be connected to the output ‘FAN’. The fan is to replenish the air in the room being monitored.
If there is an alarm situation the fan will be switched on automatically.

The fan must be ignition protected!
The fan must operate at the same voltage as the power supply to the installation, either 12 or 24 volt direct current respectively.
The output ‘FAN’ is suitable for a fan requiring a current of maximum 1 A. Fit a 1 A fuse in the plus wire to the fan. NB: the gas detector switches the minus connection (-, earth) to the fan!

Technical details

:1A
Length of sensor cable| :5 metres

The following applies to the detection of petrol vapour:
Warning : 8 % of the lower explosion limit (LEL) (480 ppm)
Alarm : 10 % of the upper explosion limit (LEL) (600 ppm)
The following gas concentrations and time constants are defined for the detection of CO (carbon monoxide):

CO (ppm)

1. SAFE
2. WARNING CO
3. ALARM CO

Overall dimensions

Fokkerstraat 571 – 3125 BD Schiedam – Holland
Tel.: +31 (0)88 4884700
sales@vetus.com – www.vetus.com
Printed in the Netherlands
100106.01 2023-06

References

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