Crowcon Gasman II User manual

GASMAN II
PERSONAL SINGLE GAS MONITOR
INSTRUCTION MANUAL
ISSUE NO. 5 11/99 STOCK NO.
M07-118

Gasman II
Flammable
Rechargeable Batteries
Upon receipt we recommend that Flammable
instruments are fully charged for 16 hours
prior to use.
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This product has been tested and
found to comply with the European
Directive 89/336/EEC
WARNING: Substitution of components may impair
Intrinsic Safety.

Contents Page
1. Quick Operating Guide 4
2. Unpacking 4
3. Introduction 5
4. Specification 6
4.1 Instrument Settings 8
4.2 Battery Lifetime 9
4.3 General Assembly 10
5. Operation 11
5.1 Switch-on sequence 11
5.2 Display Symbol Guide 12
6. Batteries 15
6.1 Recharging 15
6.2 Changing the batteries 16
6.3 Charger Supplies 16
7. Alarm Types 16
8. Keypad Adjustments 18
8.1 Viewing settings 18
8.2 Adjusting settings 19
8.3 Zeroing 20
8.4 Calibration 20
9. Accessories 21
9.1 Calibration Adaptor 21
9.2 Universal Clip 21
9.3 Rubber Boot 22
10. Routine Checking 22
10.1 General 22
10.2 Sensor filter 22
10.3 Zero & Calibration 23
10.4 Sensor Replacement 23
11. Troubleshooting Guide 24
11.1 Error Codes 25
12. Datalogging and Datacomms 26
12.1 Hardware Interface 27
13. Sensor Limitations 27
14. Accessories and Spare Parts 28
14.1 Accessories List 28
14.2 Spare Parts List 29
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1. Quick Operating Guide
Switch on: Press large button; alarm
test and LCD test occurs,
followed by battery level
display.
Normal condition: Gas level displayed on
LCD*. Intermittent
‘confidence’ signal
(if selected).
Alarm condition: Fast flashing red LEDs
and sounder.
Alarm reset: Press large button when
hazard has passed.
Activate backlight: Press and hold large
button.
Switch Instrument Press both buttons
Off: together & release.
Zero instrument: When unit is off, press
small button & hold.
The symbol will
appear. Keeping the small
button pushed in, press
the large button.
For oxygen models, the symbol appears,
and pressing the large button sets the reading
to 20.9%.
* reading may take a few seconds to settle
after switch-on.
2. Unpacking
Check the shipment against the packing list
and carton labels. Instruments and
accessories may be packed separately. Smaller
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items may be located under cardboard partitions,
so check carefully for contents. If you are missing
any items please contact Crowcon immediately.
Be prepared to quote the instrument’s serial
number which can be found at the bottom of the
label on the rear of the instrument.
Ensure batteries are fresh/charged prior to use.
See ‘Switch on Sequence’ (Section 5.1) for details
of the battery level indicator.
3. Introduction
The Crowcon Gasman II is a personal gas
detector which can continuously monitor the level
of oxygen or the presence of a single toxic or
flammable gas. It is designed to be worn by
individuals working in hazardous environments
such as confined spaces and will give a loud
audible and bright visual alarm warning when pre-
set concentrations of gas are exceeded.
It is a simple instrument to use, designed to
provide reliable service for many years. The
shape of the instrument has been designed to fit
comfortably against the body and pose the least
restriction to movement. It can fit in a pocket or
on a belt.
Datalogging is standard on all models providing
approximately 1 week capacity at a 1 minute
sampling rate. This capacity can be extended by
reducing the sampling rate (see Section 12).
Toxic and oxygen versions are fitted with alkaline
batteries which offer a life of 1 year*. Flammable
versions are fitted with re-chargeable nickel metal
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hydride batteries which have a life of 10-12 hours*
and up to 1000 charge/discharge cycles.
* depending on alarm incidence.
4. Specification
Weight 210g (7.4oz)
Dimensions 130h X 60w X 30d mm
(5.1h X 2.4w X 1.2d inches)
Typical measuring 0-100% LEL flammable gas,
ranges 0-25% volume O2,
0-50ppm H2S, NH3,
0-500ppm CO,
0-5 ppm CI2, PH3,
0-10ppm SO2, NO2,
0-25ppm HCN,
0-999PPM H2.
Typical alarm 20 & 40% LEL methane,
levels 19% and 23% oxygen,
10 & 20ppm
hydrogen sulphide,
50 & 100ppm
carbon monoxide.
Typical TWA alarm 15ppm STEL, 10ppm
levels for toxic gas LTEL (H2S),
version 300ppm STEL, 50ppm LTEL
(CO).
Typical response methane 20 seconds,
times (T90)oxygen 10 seconds, toxic
gas 20 seconds
Visual alarm Ultra bright flashing red
indicators LED pair in alarm.
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Audible alarms Programmable from five
different tones, 85dBA at 1
metre. (92dBA at 1 ft).
Intermittent blip for
discharged battery.
Selectable ‘confidence’ blip.
Fault warning.
Display Custom 7 segment high
contrast LCD giving gas
reading. Symbols for low
battery, peak hold, zero
mode, cal mode and alarm
annunciation. LED backlight.
Operating -20° to 50°C (-4°F to 122°F)
temperature range
Humidity 0-95% RH, non-condensing.
Expected sensor Pellistor 5 years, toxic gas 3
life years, oxygen 1 year.
Batteries 1.1Ah nickel metal hydride
rechargeable: 10-12 hours
between recharge. AA size
alkaline replaceable: Typical
life 1 year.
Aspirator Manual bulb type with 2m of
hose, non-absorbent,
hydrocarbon resistant.
Approval code Toxic/oxygen: EEx ia IIC T4
(Europe) (Tamb=55°C)
Flammable:
EEx iad IIC T3 (rechargeable),
T4 (non rechargeable)
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(USA & Canada) Class 1, Division 1, Groups A
B,C & D.
Standards EN50014, EN50020,
(Europe) EN50018
(USA & Canada) UL913
RF Immunity Tested to IEC801-3 and
meets EN50082-2
RF Radiation Tested to EN55022 Class B
and meets EN50081-2
Battery charging Standard charge rate 16
hours, trickle charge will not
damage batteries. Charger
Input 11-29V DC. Mains
adaptors have 110 or 230V
AC inputs. Batteries must be
charged in an ambient
temperature between 0°C
and 40°C.
4.1 Instrument Settings
Unless otherwise specified, instruments will be
shipped from the factory with default settings.
These cover alarm tones, logging period, and
detailed operation of each alarm point. Full
details are printed on the Configuration Report
supplied with each instrument. Those settings
which are changeable from the instrument's
keypad are described in section 8.
All configuration settings may be viewed and
changed using a PC running the SetPortable
interface program (Section 12).
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4.2 Battery Lifetime
•Rechargeable flammable instruments’
batteries last 12 hours on a full charge.
•Non-rechargeable flammable instruments
using alkaline batteries last 24 hours.
•Toxic and Oxygen instruments last 1 year
using alkaline batteries, under normal usage
conditions.
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4.3 General Assembly
Key:
1 Gas Sensor
2 Fixing screw/charging contact
3 Small button
4 Calibration adjuster cover
5 Alarm LED lens
6 Alarm sounder
7 Top moulding
8 Gas legend
9 Display window
10 Large button
11 Base moulding
12 Universal clip
13 Certification labels
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5. Operation
5.1 Switch-on Sequence
Make sure you are in clean air, then switch on
the instrument by pressing the large button.
The instrument tests all LCD segments, red alarm
LEDs and sounder for 5 seconds, then displays
the battery condition for 5 seconds before
entering monitoring mode. The battery condition
is indicated by the battery symbol and a number
representing the percentage battery capacity
remaining.
NOTE: A reading below 20 indicates that
replacement or recharging is due. For the
first 4-5 charge cycles, rechargeable batteries
cannot hold a full charge. Initial operation
time is therefore around 71/2hours.
The instrument is now ready to be used:
•The gas level will be shown numerically on
the display.
•The instrument may be configured to display
nothing (alarm only application).
•The display backlight is activated by pressing
and holding the large button.
•If the display shows an E code (e.g. E2)
instead of the gas level, this indicates a fault
condition as defined in Section 11.1.
Figure 5.1 Typical monitoring display.
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NOTE: It is possible that the instrument may
display an alarm condition upon entering the
monitoring mode (indicated by a flashing alarm
symbol). This is due to the sensor taking time to
settle after switch on. It is NOT a fault. Press the
large button to cancel the alarm after a few
seconds.
If configured to do so, the instrument will give an
intermittent audible blip and/or visual red flash to
indicate correct functioning of the instrument.
Selection of these ‘confidence’ signals will affect
battery life according to the table in Section 4.2.
Pressing both buttons together will switch the
instrument off. The instrument may be configured
in such a way that it is not possible to turn it off via
the push buttons. In this case, only a supervisor
with a computer link can switch the instrument off.
5.2 Display Symbol Guide
Figure 5.2 Display symbols
The gas level is continuously shown on the
display. The surrounding symbols will only be
displayed when the appropriate function or
warning is active.
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Peak hold
Indicates that the reading displayed is the highest
level recorded since the instrument was switched
on or reset. For oxygen, Peak Hold records the
lowest value encountered. Peak Hold values can
be toggled on and off by pressing the small button
when the unit is on. The symbol will come on if
Peak Hold is operational. The large button is
used to reset the peak value when the symbol is
displayed.
Battery low
When this symbol flashes and the sounder emits
an intermittent blip, it is an indication that there is
less than 10% of battery life remaining. A
toxic/oxygen instrument may run for weeks in this
condition allowing time to schedule a battery
replacement service. A flammable instrument will
run for 1/2hour at most and should therefore be
recharged immediately.
Zero
Indicates unit is in adjust zero mode. See
Section 8.3.
Calibrate
Indicates unit is in adjust calibration mode.
See Section 8.4.
Alarm 1
When the first alarm level is reached, this symbol
will flash and the visual and audible alarms will be
activated. See Section 7, Alarm types.
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Alarm 2
When the second alarm level is reached, this
symbol will flash and the visual and audible alarms
will be activated. See Section 7, Alarm types.
15 Minute TWA Alarm (STEL)
Toxic versions have TWA alarms in addition to the
two levels of instantaneous alarm. If the 15
minute exposure level is reached, this symbol will
flash and the visual and audible alarms will be
activated. The minimum averaging time before a
STEL alarm can be triggered is 1 minute.
8 hour TWA Alarm (LTEL)
If the 8 hour exposure level is reached, this
symbol will flash and the visual and audible
alarms will be activated. The minimum averaging
time before a LTEL alarm can be triggered is 15
minutes.
Personnel should not continue to work after a
TWA alarm occurs as this indicates the maximum
safe cumulative exposure has been reached.
Workers should remove themselves to safety or
use breathing apparatus.
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6. Batteries
WARNING - Battery charging or replacement should
only take place in a SAFE AREA, i.e. no explosive risk.
WARNING - to ensure Intrinsic Safety, the charger
must only be used with DC supplies as specified in
Section 6.3.
6.1 Recharging
Flammable gas versions are normally supplied with re-
chargeable batteries, though a non-rechargeable type
using alkaline batteries is available.
To recharge, connect power to the charger and place the
instrument in the cradle. The charger’s red LED will light
while the instrument is being charged. Full recharge from
flat takes 15 hours, with the instrument switched off. When
fully charged, the green LED will illuminate on the charger.
Once the charge cycle is complete, the red LED will
occassionally light for a minute or so to ensure the
batteries are kept topped up.
If the instrument is not in use, it should be charged once
per fortnight, or it can be stored permanently in its charger
without damage. If it is left uncharged for 3 weeks or
more, the batteries may self-discharge to a point where
the battery charger cannot supply enough charge current
to restore the batteries to a fully charged state. If this
occurs, a “boost-charge” can be provided by pressing the
button which is mounted on the rear of the charger. This
can be accessed through the top-left mounting hole with a
blunt object such as a ball-point pen.
The charger also acts as a comms interface for all
instrument types. Non-rechargeable units will not be
recharged in this instance.
The charger makes contact with the instrument via the two
side fixing screws. As these are electronically protected,
no harm will come from these contacts being short
circuited during use.
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6.2 Changing the batteries
Toxic gas and oxygen versions are supplied with
alkaline batteries which should power the
instrument for a year.
•Disassemble in a clean, dry environment and
observe anti-static handling precautions.
•Remove side fixing screws
•Remove calibration adjuster cover.
•Slide lower case section from top section.
•Remove batteries from clips.
•Replace batteries using only approved types*
ensuring correct polarity orientation.
•Refit lower case section and screws ensuring
seals are correctly fitted in grooves.
*Duracell MN1500 LR6
Ever Ready Energizer LR6BA
6.3 Charger Supplies
These must not exceed 29 volts DC (11 to 16V is
ideal). They can be either:-
(a) a mains DC power supply such as those in
Section 14.2, “Spare Parts” meeting
EN60742 insulation class II (Europe) or
UL1310 insulation class II (United States) or
(b) a battery or other isolated DC source.
7. Alarm Types
There are two instantaneous alarms; level 1 and
2. For toxic gas instruments, there are also two
time weighted average (TWA) alarms which
operate at short term (15 minute) and long term
(8 hour) exposure limits. All alarm thresholds can
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be adjusted from the instrument keypad (see
Section 8) by means of a screwdriver. Alarm
thresholds may also be set via the computer
interface (see Section 12) and the following
parameters may be set for instantaneous alarms:
•Normally triggered on a rising level, alarms
may be set to trigger on a falling level as with
oxygen deficiency alarms.
•Alarms may be latching, requiring manual
reset, or self clearing when the hazard has
passed.
•Normal alarms cannot be cleared whilst the
gas hazard persists. It is possible to set level
1 so it may be silenced (the red LEDs will
continue to flash). This allows the user to set
a ‘pre-alarm’ warning at a low gas level and a
non-silenceable alarm at a higher level.
•Unused alarms may be deactivated.
•The level 1 alarm may be set to be visual only
(not oxygen units).
If any alarm event is triggered, the red LEDs will
flash and the sounder will emit a loud tone. Each
alarm type has a different tone sequence which
can be selected from a menu if using
SetPortable software (Section 12). Alarm 2’s tone
takes precedence over alarm 1’s tone. The alarm
type will be indicated by a flashing symbol on the
LCD (see Section 5.2). If either of the TWA (time
weighted average) symbols appear on the
display, this indicates that the cumulative
exposure to toxic gas has been reached for an
8-hour shift or a 15 minute ‘window’. UK Health
& Safety regulations require that workers should
leave the hazardous area once they have
exceeded this dose. A TWA alarm cannot be
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manually reset. The 15 minute TWA alarm will self
clear when the average exposure over the
previous 15 minutes falls below the set threshold.
The 8 hour TWA alarm will self clear when the
average exposure over the previous 8 hours falls
below the set threshold. Average exposure values
are cleared when the instrument is switched off.
A worker should not resume work where the risk of
gas exposure persists until the Safety Officer
declares it safe.
The large button may be used to silence or clear
certain instantaneous alarms as the configuration
permits.
8. Keypad Adjustments
When the instrument is off, calibration and alarm
settings can be viewed and adjusted if required.
8.1 Viewing settings
•Press both buttons to turn instrument off.
•Press and hold small button to view the zero
level. The symbol appears. The
numbers will flash until the reading has
stabilised. The reading cannot be adjusted
until the digits stop flashing.
Note. The zeroing facility is not available on
oxygen units.
•Release small button then press and hold
again to view the calibration level. The
symbol appears. Unless calibration gas
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is being applied to the sensor, the display
should read zero, or 20.9 for oxygen.
•Release small button then press and hold
again to view Alarm 1. The symbol
appears and the Alarm 1 level is displayed.
•Release small button then press and hold
again to view Alarm 2. The symbol
appears and the Alarm 2 level is displayed.
•Release small button, then press and hold
again to view the 15 minute STEL. The
symbol appears and the 15 minute STEL
alarm level is displayed.
•Release small button then press and hold
again to view the 8 hour TWA. The
symbol appears and the 8 hour TWA alarm
level is displayed.
•Release small button, then press and hold
again to bring the display back to zero mode.
If the small button is released and not pressed
again for 1 minute or more the sequence
automatically starts back to zero.
8.2 Adjusting Settings
•Rotate the calibration adjuster cover to line up
the mark with the mark on the case.
•Unplug the cover. It is held captive and
should not be fully removed.
•Insert the small screwdriver supplied into the
adjustment potentiometer.
•Select the setting to be adjusted with the
small button as described in Section 8.1.
The current value is displayed and can be
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adjusted by rotating the screwdriver.
•Only one potentiometer covers all functions -
adjustments are stored by the instrument.
•Potentiometer is only active while small button
is held down.
•If the potentiometer is turned to one of its end
stops, the reading continues to advance in the
relevant direction until backed off. It is
advisable to set the pot back to its central
position after releasing the small button in
readiness for the next adjustment.
8.3 Zeroing
The reading cannot be adjusted until the digits
stop flashing. This is to allow the sensor to
stabilise after energising. A ‘short-cut’ zero is
provided by pressing the large button whilst the
small button is held down in zero mode. Only
perform this operation in fresh air.
Note: The zeroing facility is not provided on
oxygen units as the reading should be calibrated
to 20.9% in fresh air.
8.4 Calibration
As with zeroing, the reading will flash until the
sensor has stabilised. Additionally, time must be
allowed for the reading to level off once
calibration gas has been applied. The final
reading can then be adjusted. A ‘short-cut’
calibration to 20.9% on oxygen units is provided
by pressing the large button whilst the small
button is held down in calibrate mode.
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