Sensit HXG-2d User manual

851 Transport Drive • Valparaiso, IN 46383 (USA)
Phone: [phone] • www.gasleaksensors.com
Combustible Gas Detector
INSTRUCTION MANUAL
SENSIT®HXG-2d
Read and understand instructions before use.
Intrinsically Safe for Use in
Class I, Groups C and D, T3
Hazardous Locations
For use in clean dry areas only.
Suitable for combustible gases such as Methane,
Butane, Propane and Natural Gas
710183
UL 913

⚠WARNING: Do not replace batteries when an explosive atmosphere is present.
⚠WARNING: Use only DURACELL® PROCELL, Type PC1400 Alkaline Batteries
⚠WARNING: Do not mix batteries of different age or type.
⚠WARNING: For use in clean dry areas only.
⚠WARNING: Not for use in atmospheres of oxygen greater than 21%.
⚠WARNING: Substitution of components may impair intrinsic safety.
⚠WARNING:ONLY zero instrument in a gas free environment.
⚠WARNING: To maintain intrinsic safety, service must be performed by factory authorized
technicians with approved replacement parts only.
⚠WARNING: All Accessories are to be used in an area known to be non-ammable.
⚠WARNING: Use only sensor from SENSIT Technologies. PN 375-2611-01
NOTE: Performance/Accuracy aspects of this product have not been assessed and are not
covered as a part of the SGS approval.
FOR YOUR SAFETY
NOTICE
⚠CAUTION: This safety symbol is used to indicate a potentially
hazardous situation which, if not avoided, may result in minor or
moderate injury.
⚠WARNING: This safety symbol is used to indicate a potentially
hazardous situation which, if not avoided, may result in serious injury.
ii

3
CONTENTS
Preparation
For Your Safety.............................................................. ii
Parts and Accessories...................................................4
General Description.......................................................5
Sensor Specications....................................................6
Product Features....................................................... 7-9
Sensor Type ................................................................10
Basic Operation
Battery Installation/Replacement.................................11
Operation and Use ................................................ 12-14
Calibration Check ........................................................15
Calibration ............................................................. 15-16
Sensor Replacment.....................................................17
Adjustable Features.....................................................18
Options Menu ........................................................ 19-21
Warranty ....................................................... Back Cover

4
PARTS AND ACCESSORIES
Standard Accessories (Included)
Soft Carrying Pouch 360-00006
T10 Torx Wrench 360-00105
Duracell “C”Alkaline Battery (ea) 310-00004*
Wrist Strap 360-00040
Instruction Manual 750-00022
Accessories and Replacement Parts
LEL Sensor 375-2611-01
Sensor Cap with Filter Disc 882-00036
Filter Disc Replacement 360-00203
Extension Adapter 870-00012
Calibration Kits
Methane Calibration Kit
2.5% Methane/Air (21L), Regulator, Hose 881-00017
Propane Calibration Kit
1.1% Propane (21L), Regulator, Hose 881-00073
Replacement Gas Cylinders
2.5% Methane/Air (21L) 315-080012
1.1% Propane/Air (21L) 315-080022
Contact Factory for additional options.

GENERAL DESCRIPTION
The SENSIT® HXG-2d is designed to detect combustible gases. This
instrument incorporates an advanced low power semiconductor sensor to
measure a wide variety of combustible gases in both the PPM and %LEL
range. The PPM readings auto-range to %LEL when the concentration
exceeds 990PPM (2%LEL methane or 4.5%LEL propane).
Optionally all readings can be set to a resolution of 0.1%LEL only (PPM
off). An “on demand” backlight allows use in dark environments. A user
activated “TICK” control assists in locating small gas leaks.
Audible and visual alarms warn the operator of hazards. The alarms can
be set in either the PPM or LEL modes. The default alarm is 10%LEL
methane/propane.
The instrument is adjusted at the factory for either methane or propane
as the primary gas, and is calibrated accordingly. The primary gas can be
selected when ordering.
The SENSIT® HXG-2d meets US UL913 requirements when used with
approved batteries.
The SENSIT® HXG-2d is operated using approved alkaline batteries
only.
⚠ Warning: Never mix batteries of different age or type.
5

SPECIFICATIONS
SENSOR SPECIFICATIONS
TYPE RESOLUTION RANGE ACCURACY
PPM 10ppm 0-990ppm ±10%
LEL 0.1%. 0-100%LEL ±10%
PRODUCT SPECIFICATIONS
Size: 10” x 3” x 1.6” (254 x 76 x 41 mm)
Weight: 1.2 lbs. (544 g)
Operational Temp: -20° to 40° C (-4 to 104° F)
Battery Life: Alkaline: 50 hours continuous
6
The SENSIT® HXG-2d meets US UL913 requirements
when used with Duracell PC1400 batteries.
Intrinsically Safe for Use in Class I,
Groups C and D, T3 Hazardous Locations
For use in clean dry areas only.
710183
UL 913

7
PRODUCT FEATURES
SENSOR
ALARM LED
GRAPHIC DISPLAY
OPERATION BUTTONS
ELECTRONIC TICK CONTROL
FLEXIBLE GOOSENECK
BATTERY COMPARTMENT

8
PRODUCT FEATURES
SENSIT® HXG-2d instruments are constructed of durable high impact
ABS to withstand the rigors of eld use.
Incorporated in the hand grip area is the battery compartment. All
SENSIT® HXG-2d instruments require 3. Duracell PC1400 batteries
provide approximately 50 hours of continuous use.
A push button located in the center of the instrument activates an
audible tick sound that will help in locating the source of a gas leak. This
tick is generated by using specialized circuitry in combination with the
LEL sensor located at the end of the gooseneck assembly. The tick can
be easily heard with the speaker located in the back of the instrument.
A exible gooseneck is used to assist in locating the source of gas leaks
and remote sampling.
The display continuously updates the operator of changes in gas
concentrations and alerts of low battery power.
A green LED on the left side indicates the instrument is ready for use. A
red LED indicates the preset alarm points have been exceeded.

9
PRODUCT FEATURES
There are 3 operational button pads on the front of all SENSIT® HXG-2d
instruments.
BUTTON (A) POWER/MUTE
Operates the POWER and MUTE features and exit menu items.
BUTTON (B) TICK/CAL
Use to operate TICK or begin calibration.
BUTTON (C) LIGHT/ZERO
Use to turn on the backlight or manually zero the sensor.

10
SENSOR TYPE
COMBUSTIBLE GAS SENSOR
All SENSIT® HXG-2d instruments incorporate a highly sensitive
semiconductor type sensor. The function and accuracy of the sensor are
monitored and controlled by specialized circuitry and a microprocessor.
This sensor is capable of measuring concentrations of 10ppm of
methane/propane up to 100% LEL. Factory calibration uses methane
or propane depending on preset gas type.. This sensor will detect many
combustible gases.
SENSOR FILTER REPLACEMENT / CLEANING
Remove sensor cap by pressing retaining tab located on side of sensor
and pulling the cap away from base. Filter will be loose inside. Clean
lter with mild soap and water and thoroughly dry lter cap. Replace
Cap/Filter on base until retaining tab engages.
NOTE: Operating the instrument without a sensor cap or with an altered
sensor cap can cause damage to the instrument and void the warranty.

11
BATTERY INSTALLATION/REPLACEMENT
⚠CAUTION: Always change batteries in an environment free of
combustible gases.
⚠Warning: Do not mix batteries of different type or age.
Battery replacement is necessary when the BAT icon is illuminated and
the green LED is ashing. This warning indicates there is approximately
15 minutes or less operational time before the instrument turns off
automatically due to insufcient battery power.
Remove the battery sleeve cover by removing the battery sleeve screw
with a T-10 screwdriver. Depress the locking tab on the front of the
handle with a coin or at object and pull the battery sleeve handle away
from the top or display area of the instrument.
Place 3 approved batteries into the battery holder. Observe the polarity
markings on the inside of the battery holder for proper battery installation.
Improper installation will cause the instrument not to operate.
Replace the battery sleeve and allow the locking tab to snap into
position. Replace the battery sleeve retaining screw. Check to be sure
the handle is secure to the instrument body by rmly pulling the handle
away. The handle will remain in place if a proper connection is made.

12
OPERATION AND USE
⚠CAUTION: Always start any SENSIT® HXG-2d in a gas free
environment to insure a proper zero.
1. Push and hold the power button (A) until the display and backlight
illuminates.
2. If the display fails to illuminate or the BAT icon is shown on the display,
replace the batteries.
3. During successful start-up the instrument will display:
a. Display all segments
b. Turn on and off the backlight
c. Display “S2d” as the model number
d. Cal Gas (CH4 or PRO)
e. Display software version
f. Display “50.0%” or “10.0%” indicating the LEL Calibration point
for the instrument for CH4 gas type only.
g. Display “dIS” indicating display resolution of PPM / %LEL or both.
h. Display “AL” followed by the alarm set point.
i. Activate the alarm sound and red LED for 3 beeps
j. Continue to ash all segments until proper warm-up is
attained (no more than ve minutes)
k. Flash “Zro” indicating fresh air zeroing
l. Working display is shown
NOTE: A failure to properly zero due to the presence of gas is indicated
by “bAd” + cal icon illuminated on the display. Pressing the ZERO (C)
button for 6 seconds and releasing will restart the zeroing process.
NOTE: If a sensor is completely inoperable or improperly zeroed at start
up, the display will show “bAd”.

13
OPERATION AND USE
4. All instruments read with a resolution of 10ppm up to 990ppm. The
scale automatically switch to LEL when 990ppm is exceeded with a
resolution of 0.1% LEL.
Optionally all readings may be displayed in LEL only. Readings beyond
100% LEL are indicated by “OL” (overload).
5. It may be necessary to manually zero the instrument based on
company practices and environmental conditions.
⚠CAUTION: Zeroing should be done in a gas free environment only.
6. When testing high areas or overhead lines the use of the optional
extension adapter will allow a broom handle or painters stick to extend
the instrument to the area where sensing must be accomplished. This
slides onto the battery sleeve and is held in place by the locking nut
assembly.
7. When a gas is sensed the display will update. If an alarm condition
exists, based on a preset alarm point, the red LED will ash and the
alarm will sound.
8. During an alarm condition (factory default at 10% LEL methane) the
display will ash and an audible alarm will sound indicating a potentially
unsafe environment. To disable the audible alarm press and release the
MUTE button (A). To enable the alarm press and release it again.

14
OPERATION AND USE
NOTE: These instruments have cross sensitivities to a variety of
gases.
9. To assist in locating the source of small combustible gas leaks or
surveying areas outdoors or indoors, press and release the TICK/CAL
button (B). This will start an audible tick preset at 2-3 ticks per second.
Move the sensor toward the area suspected of leakage. As the sensor
moves closer to a leak source the tick will increase. When the tick
becomes a steady tone press the TICK/CAL button (B) again while
keeping the sensor head in the same position. This will slow down the
tick and allow the operator to nd a higher concentration using the same
procedure.
If there is no tick, press the TICK/CAL button (B) again to reset to the
steady ticking sound. For best results always use the leak detector prior
to using any liquid leak detection uids as these sensors will detect their
presence.
10. Following Country, Province, State, Municipal and/or Company
procedures move to the areas where gas readings are suspected or
must be tested. During sampling the respective readings may change.
Audible and visual alarms will activate when the preset limits are
reached.
11. When being used in dark areas press and release the LIGHT/ZERO
button (C) to turn on the back light Press again to turn off.
12. To turn instrument off, push and hold the POWER/MUTE button (A)
for 5-6 seconds until “OFF” appears on the display.

15
CALIBRATION CHECK
To verify the accuracy of any SENSIT® HXG-2d it must be exposed to
a known concentration of test gas. Any sensor that does not meet the
specications listed in this manual may require calibration or replacement.
Any time it is suspected the SENSIT® HXG-2d is not working properly,
has read “OL” or has been exposed to silicone, check calibration.
CALIBRATION
Calibration is the process of setting the readings of the instrument to equal
the value of the certied calibration gas. The instrument should operate
for 5 minutes before calibrating.
NOTE: Use of calibration kits other than those offered or approved by
SENSIT TECHNOLOGIES may cause inaccurate readings.
Repairs may be required if the instrument fails to calibrate. Use only
sensors supplied by SENSIT TECHNOLOGIES or their authorized
representative.
NOTE: During the calibration process the numbers on the display are not
the actual gas concentration.
(Continued on next page)

16
CALIBRATION
STEP 1: Prepare 50%LEL or 10% LEL Methane/Air, or 50%LEL
Propane/Air, depending on what calibration point the unit calls for, and
proper regulator and adapter. Press and hold the ZERO (C) button to
reset fresh air zero (indicated by “Zro” on the display)
STEP 2: Press and hold the TICK/CAL button (B) for 6 seconds until
“CH4” or “PRO” is displayed.
STEP 3: Attach the adapter to the sensor cap assembly.
STEP 4: Press the TICK/CAL button (B) and the cal icon will ash
and numbers will change on the display. Upon completion, the working
display will appear with the gas reading.
A reading of “bAd” indicates unsuccessful calibration. Repeat process if
“bAd” appears. Press the POWER/MUTE button (A) to clear the “bAd”
display reading and go to the working display.
Continued unsuccessful calibrations may indicate faulty sensor. Any
instrument that will not calibrate or continues to indicate “bAd” on
the display, should be taken out of service. Please contact Sensit
Technologies for further assistance.

17
SENSOR REPLACEMENT
⚠WARNING: Perform service only in areas known to be non-
ammable.
⚠WARNING: Substitution of components may impair intrinsic safety.
⚠WARNING: Use only sensor from SENSIT Technologies.
Part Number 375-2611-01
Step 1: Turn off instrument.
Step 2: Remove sensor cap and sensor retainer lter.
Step 3: Remove sensor. Observe the location of the tab relative to the
white dot beneath, on the circuit board.
Step 4: Replace sensor. Be sure to align the sensor tab directly over
the white dot.
Step 5: Place sensor retainer lter inside sensor cap and install sensor
cap.
Step 6: Turn instrument on and wait for zero process to complete.
“bAd” indicates improperly installed sensor or additional warm-up time is
required. Allow the instrument to operate for 10 minutes, then press and
hold the C button to reestablish zero. If “bAd” remains on the display,
remove the instrument from service.
Step 7: If zeroing of the replacement sensor was successful and
at least a 5 minute warm-up has been observed, proceed with the
calibration instructions.

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ADJUSTABLE FEATURES
MENU ITEMS
Alarm PPM
Alarm - LEL
Show PPM
Gas Type
RANGE
100-990%
2-60%
10PPM Resolution
Methane or Propane
DEFAULT
OFF
10%
ON
Methane (CH4)
Changing the calibration gas for CH4 (methane) or PRO
(propane)
1. While the unit is on and in the working display, press and release
the A and C buttons together until the display shows Opt.
2. Press and release the C button until CAL CH4 or CAL PRO is
displayed.
3. Press and release the B button until desired calibration gas is
displayed (CH4 or PRO).
4. Press and release the A button. The unit will exit back to its
working
5. Turn the unit off and back on. Verify during the warm-up sequence
that the gas type desired is displayed. Calibrate to the gas type
displayed.

19
The option menu is used to change the unit to show ppm/LEL or LEL
only. It is also used to change the alarm point of the unit in ppm or
LEL. LEL alarm point is adjustable from 2% to 60%. PPM alarm point
is adjustable from 99 to 990 PPM. Use the steps below to make
adjustments.
How to congure for LEL or PPM and LEL display (Current
alarm point remains)
1. Press and release the A and C buttons together and release.
“Opt” will be shown
2. Press and release the B button. “diS” and “%” will be shown on
display. Chose from one of the options listed:
a. (LEL only display) Press and release the B button. “AL” and “%”
will be shown on display. Press and release the A button. Unit
will return to working display.
b. (PPM and LEL display) Press and release the C button. “diS”,
“%” and “ppm” will be shown on display. Press and release the B
button. “AL” and “ppm” will be shown on display. Press and
release the A button. Unit will return to working display.
OPTIONS MENU

20
HXG-2D Option Menu (continued)
How to change LEL Alarm point with PPM readings on display
1. Press and release the A and C buttons. “Opt” will be shown.
2. Press and release the B button. “diS” and “%” will be shown.
3. Press and release the C button. “diS, “%” and “ppm” will be shown.
4. Press and release the B button. “AL” and ppm” will be shown.
5. Press and release the C button. “AL” and “%” will be shown.
6. Press and release the B button. Current LEL alarm point will be
shown. Use the B button to decrease this number, or use the C
button to increase this number.
7. Press and release the A button. “CAL”and “CH4” will be shown.
8. Press and release the A button. Unit will return to working display.
OPTIONS MENU