GDS GasVac 311 User manual

TECHNOLOGIES
E: [email protected] T: [phone]
GDS TECHNOLOGIES LTD |FUSION POINT |ASH LANE |GARFORTH |LEEDS |LS25 2GA |UK www.gds-technologies.co.uk
This document is not contractual and the equipment specification may be modified at any time without prior notice.
C1732
Manual No. 330DIC
Issue A v1
GasVac®311
SINGLE LINE NETWORK
GAS SAMPLE UNIT
OPERATING HANDBOOK

2
Contents
System Overview.................................................................................................................. 3
Installation, Operation ......................................................................................................... 4
Access to the Menu .............................................................................................................. 5
Technical Specification....................................................................................................... 6-7
Service/Routine Attention...................................................................................................... 8

3
System Overview
The GasVac 311 system is designed to monitor gas levels in situations where the positioning of
conventional gas sensors may not be practical. This may be due to equipment security, cable
routing, access for detector head installation/maintenance, or harsh environment, or a cost effective
means of monitoring plant rooms, supermarkets, cool stores and designated hazardous areas,
such as tunnels, marine applications, or underground/high level voids.
A gas sample is continuously extracted via a unique micropore sample technique having a
minimum of two and maximum of 30 intake modules along its sample line network. The sampling
unit provides a gas level reading with three alarm trip points, and a range of signal outputs for
annunciator or control functions.
The system is supplied factory programmed and pre-calibrated to enable immediate operation
by connection of a power supply and attachment of the sample line and its intake module network.
OUT IN
Sample
1
2
3
Power
Alarm 3
Alarm 2
Alarm 1
Fault
Inhibit
Gas AlarmGasVac
Fig 1
1 2
Typical Arrangement
Intake
modules
OUTOUT
IN
1Sensor sample out → 1 litre / min
2Draw pump out → 3 litre / min

4
Installation
The unit should be mounted in a position which is accessible and in the field of vision. Mains should
be from a fused supply (2A) and connected to the mains input terminals of the power supply unit.
The vent port should be piped to atmosphere without reduction. This will prevent possible back
pressure affecting the sensor reading.
A minimum of two intake modules should be located within the target area, their position will
be depedant upon the type of gas to be monitored and its density with respect to air.
Heavy gases (LPG, Propane, Butane, Refrigerant Gases) – locate at 15 to 20 cm from the floor.
Lighter gases (Methane, Natural Gas, Town Gas) – locate at 5 to 10 cm from the ceiling.
Carbon Monoxide – locate at 1.5 to 2 metres from floor level.
The control panel should be mounted away from direct heat.
Operation
On power up the green power indicator will flash for 60 seconds indicating that the system is
stabilising. During this period all alarms are held in the off position.
After the stabilisation period any gas detected by the sensor will be indicated on the display, with
any alarm level being exceeded resulting in the sounder and appropriate red alarm LED and relay
activating.
Pressing the reset pad will result in the sounder being silenced. Alarm indicators and relays may
only be reset when the indicated gas level has reduced to below that of the alarm trip points.
A reduced power mode feature is activated one hour after any operator activity. This state is
indicated by a screen power reduction of approximately 50%. Pressing any button will return the
screen to full display.
4-20
OV
Lo
Hi
24V
NO C
AL3
NC NO C NCNO C
AL2
NCNO C
AL1
NC
W
+
Y
sig
P
-
SENSOR FAULT
+ -
4-20mA
Output
PC comms via
hyperterminal
Sensor
Voltage
test pins
Zero LED
4mA
J28
20mA
Zero
Gain
J3
J29
J11
J18 J17 J16
J15
J19
J1
TP3
A B
A
B
A
B
TP11
TP12
TP6TP7
TP13
TP8 TP9 TP2
TP4
TP1
Contrast
J6
J20
J5
J4 J7
J12
J13 J14 J8
J8
x fault
Inhibit Ov 24v J1 CANbus – EOL – see Combi
J4/7 For Semiconductor sensors
J5/11 Sensor (B-catalytic A-4~20mA)
J6/20 Sink/Source 4~20mA output
J8 Gain – factory set
J9 Normally fitted 4~20mA out
J12 Bridge fault enable fit for catalytic sensor
J13 See J8
J14 Sensor supply selector
A for catalytic sensor
B for 4~20mA sensor
J15 Sounder mute
J16 N/E - A1 relay link on
J17 N/E - A2 relay link on
J18 N/E - A3 relay link on
J19 N/E - fault relay link on
J28 Reset processor
J29 Address change enable – see Combi
A
B
4~20mA In
Sensor
supply
adjust
4~20mA
Output
Fig 2

5
Access to the Menu
Press 2 to access the menu followed by 231. Menu entry will be at level 5 (Exit). Pressing 1 or 3 will
enable travel through the sub menus 1-9 and adjustment of settings. Pressing 2 enables access
into each sub menu and on completion pressing 2 will confirm your selection and move to the next
setting.
1. Zero/Span – in clean air Zero display – apply test gas at the peak reading and adjust the span.
2. Alarm Levels – 3 alarm levels. Pressing 1+3 together will cycle through rising and falling alarms
and latched (L) or unlatched (U) (auto reset) relays in the following order:
( ) L, ( ) U, ( ) U, ( ) L. Default setting latched.
3. Alarm Delay – time to alarm in seconds (default setting 2 seconds) maximum 255 seconds.
4. Inhibit Alarm – isolate alarm functions – maintenance and test periods.
5. Exit Press 2 – entry and exit point of menu.
6. L.C.D Brightness – adjustment of display brightness.
7. L.E.D/Relay Test – turns indicators and relays ON.
8. Auto Zero – use only when very low alarm levels are required (<10% of scale).
9. Sensor Address – used when connecting to a GDS Combi system.
A. 4~20mA output adjust (Tox/O2only). Pressing 1 or 3 will allow for output to be adjusted to 4mA
and 20mA as measured on test pins 8+9.
Changes to gas type and range can be made by connecting GDS RS232 pod Part No. 160-510
to J3 and using a PC running hyper terminal at 4800 baud.
The hyper terminal output screen shows continuous data output/commands and allows input from
the PC keyboard. Pressing ‘C’ enters calibration mode, press ‘G’ to change the gas type to match
the cell being used. Note – the range of the new gas has a default value but can be adjusted by
pressing ‘R’.
For catalytic sensors course zero adjustment is achieved by turning the zero potentiometer (10 turn)
until the zero LED just turns off – see fig 2 on page 4.

6
Technical Specification
POWER SUPPLY
Input 230/115v AC – 50/60 Hz - 24v DC
CONSUMPTION
70W full alarm
INDICATORS
Gas level readout – two line alpha numeric back lit display
Power – green L.E.D
Low, High, Over-range alarm – red L.E.D
System fault / Flow fail – amber L.E.D (Pump fail/line blockage)
USER INTERFACE
Panel mounted push buttons (three)
Reset – mute sounder, reset alarms
Menu – see page 5
ALARM SETTINGS
Normally latched – option auto reset – see relays
OUTPUTS
Alarm 1, 2, 3 relays S.P.C.O. N/D (N/E option)
Fault relay S.P.C.O. N/D (N/E option)
All relays latched (unlatched option – select before power up – see fig 2)
Relay – flow fail S.P.C.O. – flow fail alarm board
All contacts rated 3A 230v AC
All relay contacts used to switch inductive loads (relays etc) should have suppressors fitted,
typical device Farnell 772-756
Output – 24v DC @ 100mA - Available for auxiliary equipment
4~20mA analogue output
CANbus – see Combi alarm systems
Logging – variable time, rollover/stop
Storage 2,800 readings.
AUDIBLE ALARM
Lo, hi, fault flow fail alarms 85dB @ 10cm
DIMENSIONS
H 265mm x W 315mm x D 75mm
CABLE ENTRY
Base – Rear
FIELD TERMINALS
Screw Type – accepting up to 2.5 mm cable
WEIGHT
3.7 kg
FINISH
Epoxy coated steel – Ash Grey BSA01
Plastic push on fascia – Grey/White Ral 9002
INGRESS PROTECTION
IP 52 Standard IP66 option (overhousing)

7
PUMP
Sample pump – 24v DC brushless-diaphram
OPERATING TEMPERATURE
-10 to +45˚C
SAMPLE TEMPERATURE
-10 to +50˚C – high temperature versions available
RESPONSE TIME
20 to 80 seconds
INTAKE MODULES (part No. 008-556 Design Reg 6009030)
All weather
Orientation – any
Size – 100mm L 32mm D
Connections – push fit 6mm
SAMPLE LINE
Material – Nylon, Stainless Steel, Copper
Size – 6 mm OD, 4 mm ID – push fit coupling
SAMPLE NETWORK LENGTH
100m total
SAMPLE VENT PIPE
6-8 mm – push fit
OPTIONS
Catch pot
Water auto drain
Waterproof over housing IP66
Sample line flame arrestor
Snorkel valve water trap
Sensor
Exhaust
Particulate filter
Sample in
Power
board
Alarm
Monitor
PCB
24v DC
24v DC supplyMains supply
Auto
drain
(option)
Sample
Pump
Flow
Monitor
Fig 3

Service Routine Attention
The owner or occupier of the site should place the supervision of the system in the charge of a
responsible executive, whose duty it should be to ensure the day to day operation of the system and
to lay down the procedure for dealing with a gas alarm or fault warning.
The operating instructions should be kept available, preferably with the control unit. All faults,
service test and routine attention given should be recorded.
DAILY: A check should be made that any fault condition which may be indicated is in fact being
attended to and that all other indicators are normal.
WEEKLY: Check the catch pot (where fitted) for high levels of particulate or water contamination,
replace filters as necessary.
Twice yearly maintenance schedule
1. Zero check to sensor
2. Sensor to be gas tested and calibrated
3. Test gas applied to all intake modules
4. Field indicators to be tested
5. Alarm trip points checked and re-aligned
6. All faulty parts replaced where required
7. All filter elements checked and replaced as necessary (catch pot filter)
8. Power supply – voltage check
9. Visual inspection made to confirm that the sample line fittings and equipment are secure,
undamaged and adequately protected
12 monthly maintenance schedule
1. Twice yearly schedule
2. Draw pump overhaul (diaphragm replacement)
3. Auto drain – pressure tube replacement (if fitted)
36 monthly maintenance schedule
1. Pump replacement
RECOMMENDED TEST GAS:
8

E: [email protected] T: [phone]
GDS TECHNOLOGIES LTD |FUSION POINT |ASH LANE |GARFORTH |LEEDS |LS25 2GA |UK www.gds-technologies.co.uk
This document is not contractual and the equipment specification may be modified at any time without prior notice.