Crowcon Gas-Tec Manuale utente
Gas-Tec
User manual
M07979
Issue 1 October 2009
Contents
Standards information and hydrogen
safety 4
11 Standards 4
12 Safety: 4
13 Battery change 4
14 Charging 4
15 Zeroing 4
16 Avoid contamination 4
17 What's in the box 5
18 Unit orientation 6
Control and monitor the Gas-Tec with the
LCD display 8
II. Gas-Tec Introduction 9
21 Product description 9
22 Flame Ionisation Detection (FID) 9
23 Hydrogen Safety 9
24 What Gas-Tec detects 10
III Operation 11
Prior to SWITCH ON 11
31 Getting ready 11
32 Start Up 12
33 Detecting gas 14
34 Shutting down 15
IV Function overview 16
42 Menu structure (including range) 17
V Set-up 18
51 Choosing how to display the gas
reading 18
52 Setting time and date 19
VI What the Gas-Tec shows 20
61 Overview 20
62 Special events in the record 21
63 GPS 21
64 Acquiring and using data from the
Gas-Tec 23
VII Managing the Gas-Tec 24
72 Set up the detector 24
73 Service Timer 25
74 Change PIN 25
75 Service functions 25
VIII Alternative probes 26
81 Alternative probes 26
82 Using Gas-Tec in a moving vehicle 26
IX Specification 27
X Looking after Gas-Tec 28
101 Gas cylinder 28
102 Filters 28
103 Probes and tubes 28
104 Rechargeable battery 29
105 Servicing 29
XI Spares and accessories 30
XII Hydrogen Safety 32
Safe use of hydrogen cylinders 32
121 General guidelines 32
122 Using Hydrogen Gas Cylinders 32
123 Filling the hydrogen cylinder 32
XIII Troubleshooting 33
131 Troubleshooting guide 33
132 Warnings list 33
XIV Warranty 35
Standards information and hydrogen safety Gas-Tec
4
Standards information
and hydrogen safety
Before using the Gas-Tec, read and under-
stand the manual in full before use
Make sure the alarm warnings listed in
Section XII of the manual are fully
understood
Do not substitute components as this may
impair the IP rating, EMC performance and
invalidate warranty
Pay careful attention to warnings and
instructions displayed on the instrument
Observe site health and safety procedures
for gases being monitored and be aware of
evacuation procedures
If this product is not working properly, read
the operating manual or contact your local
authorised Crowcon service centre
1.1 Standards
Changes or modifications not expressly
approved by Crowcon could void the user’s
authority to operate the equipment and
cause safety implications
1.2 Safety:
WARNING: GAS CYLINDER
Before Gas-Tec is turned off, check the gas
cylinder has been closed off by turning the
valve, clockwise, to the ‘OFF’ position
After this is done, the gas pressure regis-
tered will drop gradually
If the valve is left open hydrogen will leak
into the enclosed space inside the instru-
ment at 15 ml/minute In extreme cases a
build-up could cause an explosion
WARNING: USE OF HYDROGEN
As with any apparatus using hydrogen
stored under high pressure, certain
precautions are prudent These mainly
concern the handling and filling of the
hydrogen cylinder and are dealt with in
section XII In addition, the detector uses
a hydrogen flame and this point should be
considered when the instrument is used in
situations where the gas concentrations
are likely to be dangerously high (above
10,000 ppm)
1.3 Battery change
Users may not change the battery of this
product: it must be replaced at Crowcon or
an approved service centre
1.4 Charging
Use only the charger supplied with the
Gas-Tec, or the vehicle charger listed in
the accessories section The unit cannot be
turned on while it is being charged
1.5 Zeroing
Gas-Tec offers the user 2 options to zero the
unit every time it is switched on
• Zero in clean air to measure the pres-
ence of gas at any level
• Zero with a background level of gas
present if the Gas-Tec is to show addi-
tional concentrations only (Offset Zero)
Please note that the zero will not take effect
if the background gas reading exceeds
30ppm (parts per million)
1.6 Avoid contamination
Do not use the equipment without a filter
assembly installed Ensure foreign bodies
and moisture do not enter the probe
Gas-Tec Standards information and hydrogen safety
5
1.7 What's in the box
1 Gas-Tec
case and tted foam insert
5 • Probe handle
• Filter attachment
• Angled ‘coat hanger’ probe
• Skids for ‘coat hanger probe’
2 Multiregional power supply 6 Spare lters
3 Manual 7 Strap
4 Quick Start Guide 8 Cylinder*
*Cylinder not supplied in USA
1 5
2 6
3 7
4 8
Gas-Tec
User manual
M07979
Issue 1 October 2009
Quick Start Guide
M07xxx
Issue 1 December 2009
Gas-Tec
Overview Gas-Tec
6
Diagram 1
1
1 ON/OFF button
2 Battery indication
Light GREEN = Power OK
Light RED = Power LOW
Flashing GREEN = Charging
3 GPS antenna
4 Strap loops
4
1.8 Unit orientation
2
3
Gas-Tec OverviewOverview
7
10
11
9
12
5 Headphone jack
6 Power supply - DC jack
7 USB port
8 Trigger jack
9 Probe connector
10 Gas cylinder on/off valve
11 Igniter
12 Gas cylinder
Diagram 2:
75 6 8
Overview Gas-Tec
8
Control and monitor the Gas-Tec with the LCD display
Control the Gas-Tec using the 'soft' buttons
The buttons at the right are linked to the labels next to them on the screen Access a labelled option by
pressing the button to the right of it
FE G
A DCB
Monitor the Gas-Tec using the Status Bar
A The battery icon shows how much charge the battery is holding The LED to the left of the icon shows
green for Power OK, red for Power Low, and flashes green while the unit is charging
B The data icon shows the status of the storage medium
C The gas bottle icon shows the pressure level in the gas bottle
D Flame icon shows whether the gas is lit
E The GPS icon reads 'GPS lock' if the antenna has locked on to available satellites; until lock is
achieved a question mark shows as above
F If the Gas-Tec needs servicing, the spanner flashes
G The number in the bulb indicates the strength of the backlight
Gas-Tec Gas-Tec Introduction
9
II. Gas-Tec Introduction
2.1 Product description
Gas-Tec is a portable gas detector for rapid survey and leak localisation GPS, data and event logging
allow survey teams to pinpoint and report on areas of significant interest
Gas-Tec senses hydrocarbons through the use of flame ionisation detection offering an extremely fast
detection speed of less than 2 seconds
Gas-Tec is worn across the body and is supplied with a standard probe A wide range of other probes and
accessories are available (see Sections VII and XI)
2.2 Flame Ionisation Detection (FID)
Flame Ionization Detection (FID) is the fastest, most sensitive and accurate way to detect concentrations
of hydrocarbons such as methane, butane or hexane The FID process uses a hydrogen flame to burn
hydrocarbons in an air sample then counting the ions produced by the burnt sample The instrument then
displays an accurate measurement of the concentration of hydrocarbons present in the sample All sam-
ples are destroyed as the measurements are generated This process takes place in a specially designed
chamber
2.3 Hydrogen Safety
Users of the Gas-Tec will need to handle the hydrogen cylinder correctly A leak from a full cylinder could
result in a build-up of gas that could, in extreme cases, cause an explosion
Install the cylinder carefully (Section III1, p10)
Check the cylinder is secured in place before opening the valve Tighten the
cylinder as tightly as possible by hand
The Gas-Tec LCD display will prompt users through the startup and shut-
down procedures ensuring safe use Gas-Tec will display relevant mes-
sages: if the gas pressure is too low
• to let the operator know if the gas pressure is too low
• to prompt the operator to open the valve to allow gas to flow
• to prompt the operator to close the valve during shut-down
• to let the operator know it is safe to power down the Gas-Tec
See the list of warnings in Section XIII for more details
The person responsible for providing hydrogen cylinders should read Sections XII and X1 of this manual
Gas-Tec Introduction Gas-Tec
10
2.4 What Gas-Tec detects
Most users will be using Gas-Tec to detect methane The instrument is also sensitive to other hydrocarbon
gases such as propane If other hydrocarbon gases are present, the Gas-Tec reading will reflect their
presence
The Gas-Tec’s response to other gases differs from the reading shown for methane
Correction factors for some common hydrocarbons are shown below:
Gas detected Divide reading by number shown to
obtain actual concentration of gas
Propane 18
Butane 20
Pentane 27
Hexane 31
Heptane 26
Octane 31
Tetrahydrofuran 05
Indice
Altri manuali Crowcon Strumento di misura
Crowcon
Crowcon Tetra Manuale utente
Crowcon
Crowcon Gasman Manuale utente
Crowcon
Crowcon APM 155 Manuale utente
Crowcon
Crowcon Triple Plus+ Manuale utente
Crowcon
Crowcon APM 145 Manuale utente
Crowcon
Crowcon Gas-Pro Manuale utente
Crowcon
Crowcon SprintPro 3 Manuale utente
Crowcon
Crowcon Gas-Pro Manuale utente
Crowcon
Crowcon APM 135 Manuale utente
Crowcon
Crowcon Clip Manuale utente
