Sensit HXG-2d User manual

10-30-09 Revised 7-20-11 ATEX V3
Sensit® is a registered trademark of J And N Enterprises, Inc.
Warning:
To reduce the risk of ignition
of a flammable atmosphere,
batteries must only be
changed in an area known
to be nonflammable.
SENSIT TECHNOLOGIES
851 Transport Drive
Valparaiso, IN 46383
Phone: [phone]
Fax: [phone]
www.gasleaksensors.com
SENSIT® HXG-2d
Combustible Gas Detector
INSTRUCTIONMANUAL
Read and understand Instructions before use.
II 2 G
Ex ib B T3
II
PENDING
Ex ib IIB T3
IP20
(USA)
Class 1, Division 1,
GroupsC andD, T3
PENDING
#750-00022 Instruction Manual
Suitablefor combustiblegases
suchas Methane,Butane, Propane
andNatural Gas
MADE
IN USA

CONTENTS
Page #1. Accessories and Parts
2. General Description
2. Specifications
3. Product Features
5. Sensor Type
5. Battery Installation
7. Operation and Use
10. Calibration Check
11. Calibration
13. Adjustable Features
14. Warranty and Repair Policy
ACCESSORIESANDPARTS
1
Standard Accessories (included)
Soft Carrying Pouch 360-00006
T10 Torx Wrench 360-00105
Duracell “C”Alkaline Battery (ea) 310-00004*
Sensor Retainer Filter 360-00203
Wrist Strap 360-00040
Instruction Manual 750-00022
Optional Accessories and Parts
Extension Adapter 870-00012
Calibration Kit 2.5% Methane 881-00017
Calibration Kit 1.1% Propane 881-00073
LEL Sensor 375-2611-01
Sensor Cap 365-00045
Battery “C” NiCAD (Rechargeable) 310-00005**
*Not included with HXG-2dr Model
**Available only for HXG-2dr Instrument with 110/220v Recharger
CAUTION: This safety symbol is used to indicate a potentially hazardous situation
which, if not avoided, may result in minor or moderate injury.
NOTICE
WARNING: This safety symbol is used to indicate a potentially hazardous situa-
tion which, if not avoided, may result in serious injury. 2
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 con-
centration exceeds 990PPM (2%LEL methane). 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” con-
trol 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.
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 is designed to meet US and European intrinsic
safety approvals as outlined in 60079-0 and 60079-11 when used with
approved batteries.
The Sensit® HXG-2d is operated using approved alkaline batteries
only. The Sensit® HXG-2dr is operated using approved rechargeable
batteries only.
WARNING: Never attempt to recharge alkaline
batteries. Never mix batteries of different age or type.
SPECIFICATIONS
Size: 10” x 3” x 1.6” (254 x 76 x 41 mm)
Weight: 1.2 lbs. (544g)
Operational Temp: -20 to 40°C (-4 to 104° F)
BatteryLife: Alkaline: 50 hours continuous
NiCad: 20 hours continuous
GENERALDESCRIPTION
SENSORSPECIFICATIONS
TYPE RESOLUTION RANGE ACCURACY
PPM 10ppm 0-990ppm ±10%
LEL 0.1% 0-100%LEL ±10%
PRODUCTSPECIFICATIONS

3
Sensit® HXG-2d instruments are constructed of durable high
impactABS to withstand the rigors of field use.
Incorporated in the hand grip area is the battery compartment.
AllSensit® HXG-2d instruments require3approved alkalineor
rechargeablebatteries. Duracell PC1400batteries provideap-
proximately 50 hours of continuous use. The approved NiCAD
batteries provide approximately 20 hours of continuous use.A
pushbutton locatedin thecenter ofthe instrumentactivatesan
audible tick sound that will help in locating the source of a gas
leak. This tick is generated by using specialized circuitry in
combinationwiththeLELsensorlocatedat theendofthegoose-
neck assembly. (Continued on page 4)
PRODUCTFEATURES
BACKLITDISPLAY
SPEAKER
(ON BACK) WARNING LED
16”FLEXIBLE
GOOSENECK
SOLIDSTATE
SENSOR
PUSH BUTTONS
RECHARGE PORT
BATTERY
COMPARTMENT
BATTERYSLEEVE
RETAINING SCREW
PRODUCT FEATURES continued from page 3
The tick can be easily heard with the speaker located in the
back of the instrument.
A flexible gooseneck is used to assist in locating the source of
gas leaks and remote sampling.
The display continuously updates the operator of changes in
gasconcentrationsand alertsof lowbatterypower.AgreenLED
on the left side indicates the instrument is ready for use or the
charging mode. A red LED indicates the preset alarm points
havebeenexceeded.
There are 3 operational button pads on the front of all Sensit®
HXG-2d instruments.
•POWER/MUTEBUTTON(A):OperatethePOWERandMUTE
feature and exit menu items.
•TICK/CAL BUTTON(B):Use tooperateTICK orbegin
calibration.
• LIGHT/ZERO BUTTON (C): Use to turn on the backlight or
manuallyzero thesensor.
4
SENSOR
FILTER

5
Combustible Gas Sensor
AllSensit® HXG-2d instruments incorporatea highlysensitive
semiconductor type sensor. The function and accuracy of the
sensoraremonitored andcontrolledbyspecialized circuitryand
amicroprocessor.Thissensor iscapableofmeasuring concen-
trations of 10ppm of methane (natural) and propane gas up to
100% LEL. Factory calibration uses methane or propane gas.
This sensor will detect many combustible gases.
SENSORTYPE
(Continued on page 6) 6
Place 3 approved batteriesinto the batteryholder. Observe the
polarity markings on the inside of the battery holder for proper
batteryinstallation.Improperinstallationwillcausetheinstrument
not to operate. Replace the battery sleeve and allow the locking
tabtosnapintoposition.Replacethebatterysleeveretainingscrew.
Check to be sure the handle is secure to the instrument body by
firmlypullingthehandleaway.Thehandlewillremainin placeifa
properconnectionismade.
WARNING: ALWAYS RECHARGE BATTERIES IN AN
AREAKNOWN TO BEGASFREE.
NOTE: Instrument cannot be recharged when operating.
Insertthe rechargeadapterfrom thechargerinto thereceptacle
on the right side of the instrument.
Connectcharger into110/220vacor 12vdcelectricalsource.
1. GreenLED illuminatedindicatesproper connection
withcharger.
2. GreenandRed LED’sarebothilluminated duringcharging.
3. When only the Green LED is illuminated the batteries are
fullycharged.
4. No LED’s illuminated indicate no connection with the
chargingcircuit.
Completechargingwill require3-6hours dependingonage and
condition of the batteries. Maximum ambient temperature for
properchargingis 45°C(113°F).
NOTE: Repeat charging cycles may be needed to bring new
batteries up to full strength prior to first use.
BATTERYINSTALLATION/REPLACEMENTcontinuedfrom pg5
BABA
BABA
BATTERTTER
TTERTTER
TTERY RECHARGING SENSIT® HXGY RECHARGING SENSIT® HXG
Y RECHARGING SENSIT® HXGY RECHARGING SENSIT® HXG
Y RECHARGING SENSIT® HXG-2dr Only-2dr Only
-2dr Only-2dr Only
-2dr Only
WARNING: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 illumi-
natedandthegreenLEDisflashing.Thiswarningindicatesthere
is approximately 15 minutes or less operational time before the
instrumentturnsoffautomaticallyduetoinsufficientbatterypower.
Removethebattery sleeve coverbyremovingthe batterysleeve
screwwithaT-10screwdriver.Depressthelockingtabonthefront
of the handle with a coin or flat object and pull the battery sleeve
handleaway fromthetop ordisplayarea ofthe instrument.
BATTERYINSTALLATION/REPLACEMENT
SENSORFILTER REPLACEMENT / CLEANING
Removesensor cap bypressingretaining tablocatedon sideof
sensor and pulling the cap away from base. Filter will be loose
inside.Clean filterwith mildsoap andwater andthoroughly dry
filtercap.ReplaceCap/Filteronbaseuntil retaining tabengages.

7(Continued on page 8)
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 or recharge 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. Display software version
e. Display “CH4” or “PRO” indicating Methane or Propane
primary gas caibration
f. Display “50.0%” or “10.0%” indicating the LEL Calibration point
for the instrument
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 flash all segments until proper warm-up is
attained (no more than five minutes)
k. Flash “Zro” indicating fresh air zeroing
l. Working display is shown
NOTE:Afailure 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”.
OPERATIONAND USE
8(Continued on page 9)
OPERATION AND USE continued from page 7
4. Allinstrumentsreadwitharesolutionof 10ppmupto990ppm.
ThescaleautomaticallyswitchtoLELwhen990ppmisexceeded
with a resolution of 0.1% LEL. Optionally all readings may be
displayed in LEL only. Readings beyond 100% LEL are indi-
catedby“OL” (overload).
5. It may be necessary to manually zero the instrument based
oncompany practicesand environmental conditions.
CAUTION: Zeroing should be done in a gas free envi-
ronment only.
6. When testing high areas or overhead lines the use of the
optionalextensionadapter willallowa broomhandleor painters
stick to extend the instrument to the area where sensing must
beaccomplished.This slidesontothe batterysleeveandis held
in place by the locking nut assembly.
7. When a gas is sensed the display will update. If an alarm
conditionexists, basedona presetalarmpoint, theredLED will
flash and the alarm will sound.
8. Duringan alarm condition (factory defaultat 10%LEL meth-
ane) the display will flash and an audible alarm will sound indi-
catinga potentially unsafeenvironment. Todisable the audible
alarm press and release the MUTE button (A). To enable the
alarmpress and releaseit again.

(Continued on page 10)
9
OPERATION AND USE continued from page 8
NOTE: These instruments have cross sensitivities to a va-
riety of gases.
9. To assist in locating the source of small combustible gas
leaksorsurveying areasoutdoorsor indoors, pressandrelease
theTICK/CAL button(B). Thiswillstart anaudible tickpreset at
2-3 ticks per second.
Move thesensor towardthe area suspectedof leakage.Asthe
sensor moves closer to a leak source the tick will increase.
Whenthe tickbecomes asteady tonepress the TICK/CALbut-
ton (B) again while keeping the sensor head in the same posi-
tion.This willslow downthetick andallow theoperator tofind a
higherconcentration usingthe 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 fluids as
these sensors will detect their presence.
10. Following Country, Province, State, Municipal and/or Com-
panyproceduresmovetothe areas wheregasreadingsaresus-
pectedor mustbe tested. Duringsampling therespective read-
ings may change.Audible and visual alarms will activate when
the preset limits are reached.
11. Whenbeingusedindarkareaspressandreleasethe LIGHT/
ZERObutton(C) toturnon thebacklightPress againtoturn off.
10
12. To turn instrument off, push and hold the POWER/MUTE
button (A) for 5-6 seconds until “OFF” appears on the display.
To verify the accuracy of any Sensit® HXG-2d it must be ex-
posed to a known concentration of test gas. Any sensor that
does not meet the specifications listed in this manual may re-
quirecalibration orreplacement.
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 CHECK
OPERATION AND USE continued from page 9

CALIBRATION
11 (Continued on page 12)
Calibration is the process of setting the readings of the instru-
ment to equal the value of the certified calibration gas. The in-
strumentshould operatefor 5minutesbefore calibrating.
NOTE: Use of calibration kits other than those offered or ap-
provedbySENSITTECHNOLOGIESmaycauseinaccurateread-
ings.Repairs may berequiredif theinstrumentfails tocalibrate.
UseonlysensorssuppliedbySENSITTECHNOLOGIESor their
authorizedrepresentative.
NOTE: During the calibration process the numbers on the dis-
play are not the actual gas concentration.
Step 1:Prepare50%LELmethane gasor50% LELPropane/Air
if your instrument is set for propane as it’s primary gas, proper
regulatorandadapter.
Step2:Press theTICK/CALbutton (B)for6secondsuntil “GAS”
is displayed.
Step 3:Attach the adapter to the sensor cap assembly.
Step4: PresstheTICK/CALbutton (B)andthe caliconwill flash
and numbers will change on the display. Upon completion, the
workingdisplay willappear withthe gasreading.
Areading of“bAd” indicatesunsuccessfulcalibration. Repeat
12
CALIBRATION continued from page 11
processif “bAd” appears. Press thePOWER/MUTE button(A)
toclear the“bAd”display readingand gotothe workingdisplay.
Continuedunsuccessfulcalibrations mayindicatefaulty 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.
Sensor Replacement:
Step 1:Turn offinstrument.
Step 2:Removesensor capand sensorretainerfilter.
Step 3:Removesensor. Observethe locationofthe tabrelative
to the white dot beneath, on the circuit board.
Step 4:Replace sensor.Be sureto alignthe sensortabdirectly
overthe whitedot.
Step 5:Placesensor retainerfilter insidesensor capand install
sensorcap.
Step6:Turninstrumentonandwaitforzeroprocesstocomplete.
“bAd”indicates improperlyinstalled sensoror additionalwarm-
uptimeisrequired. 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.

13
ADJUSTABLE FEATURES
Alarm PPM 100-990 OFF
Alarm-LEL 2-60% 10%
ShowPPM 10PPM ON
resolution.
MENU ITEMS RANGE DEFAULT
14
The above settings are field adjustable. Consult Sensit Tech-
nologiesor anauthorized servicecenter forinstructions.
WARRANTYAND REPAIR POLICY
Your SENSIT®HXG-2d instrumentiswarranted tobe freefrom
defectsin materialsand workmanshipfor aperiod oftwoyears
after purchase (excluding sensor, calibration and batteries). If
withinthewarranty periodyourinstrumentshould becomeinop-
erativefromsuch defects,theunitwill be repairedorreplacedat
ouroption.This warrantycoversnormaluse anddoesnotcover
damagewhich occursin shipmentor failurewhich resultsfrom
alteration, tampering, accident, misuse, abuse, neglect, or im-
propermaintenance.Apurchase receiptorotherproofof dateof
originalpurchase willberequired beforewarrantyperformance
willberendered. Instrumentsoutof warrantywillberepaired for
aservice charge.Return theunit postpaidand insuredto:
SENSITTECHNOLOGIES
851TransportDrive
Valparaiso,IN 46383
Phone:[phone]
Fax:[phone]
www.gasleaksensors.com to contact us at
[email protected]
This warranty gives you specific legal rights and you may also
haveother rights which vary fromstate tostate.