Sensidyne Gilian 3500 User manual

16333 Bay Vista Dr. • Clearwater, FL 33760 USA • [phone] • [phone] • [phone] [FAX] • www.sensidyne.com
REF 360-0039-01 (B)
OPERATION MANUAL
Air Sampling Pump
POWER
ENTER
SET
CAL
CLEAR
RUN/STOP
CC / MIN
“The Standard for Professionals”
™

GILIAN 3500 AIR SAMPLING PUMP
2
REF 360-0039-01 (A)
DISCLAIMER
THE SELLER ASSUMES NO RESPONSIBILITY WHATSOEVER, TO ANY PARTY WHOSOEVER, FOR ANY
PROPERTY DAMAGE, PERSONAL INJURY, OR DEATH RECEIVED BY OR RESULTING FROM, IN WHOLE,
OR IN PART, THE IMPROPER USE, INSTALLATION, OR STORAGE OF THIS PRODUCT BY THE USER,
PERSON, FIRM, ENTITY, CORPORATION OR PARTY NOT ADHERING TO THE INSTRUCTIONS AND
WARNINGS IN THIS MANUAL, OR OTHERWISE PROVIDED BY THE SELLER OR FROM NOT ADHERING
TO ALL FEDERAL, STATE, AND LOCAL ENVIRONMENTAL AND OCCUPATIONAL HEALTH AND SAFETY
LAWS AND REGULATIONS.
THE SELLER SHALL NOT BE LIABLE FOR DIRECT, INDIRECT, CONSEQUENTIAL, INCIDENTAL OR
OTHER DAMAGES RESULTING FROM THE SALE AND USE OF ANY GOODS AND SELLERS’ LIABILITY
HEREUNDER SHALL BE LIMITED TO REPAIR OR REPLACEMENT OF ANY GOODS FOUND DEFECTIVE.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING BUT
NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR USE OR FOR
A PARTICULAR PURPOSE WHICH ARE EXPRESSLY DISCLAIMED.
PROPRIETARY NOTICE
This manual was prepared exclusively for the owner of the Gilian 3500 Live Flow Air Sampling Pump. The material
within this manual is proprietary information and is to be used only to understand, operate, and service the instru-
ment. By receiving this document, the recipient agrees that neither this document nor the information disclosed
within nor any part thereof shall be reproduced or transferred, physically, electronically or in any other form, or used
or disclosed to others for manufacturing or for any other purpose except as specifically authorized in writing by
Sensidyne,␣ Inc.
COPYRIGHT NOTICE
© 2003 Sensidyne, Inc. All Rights Reserved. No part of this document may be reproduced, transmitted, transcribed,
stored in a retrieval system, or translated into any language in any form by any means without the prior written permission
of Sensidyne, Inc.
TRADEMARK NOTICE
Sensidyne, the Sensidyne logo, Gilian, and the Gilian logo are registered trademarks of Sensidyne, Inc. Gilian 3500 and
the Gilian 3500 logo are trademarks of Sensidyne, Inc. These trademarks are protected through use and registration in
the United States. Other trademarks and servicemarks used in this document are the property of their respective
companies and are used only for informational and explanatory purposes.
SOFTWARE LICENSE
The software included with the Gilian 3500 pump is the property of Sensidyne, Inc. and shall remain the property of
Sensidyne, Inc. in perpetuity. The software is protected by U.S. and international copyright laws and is licensed for
specific use with the Gilian 3500 pump. The user may NOT reverse-engineer, disassemble, decompile, or make any
attempt to discover the source code of the software. The software may NOT be translated, copied, merged or modi-
fied in any way. The user may NOT sublicense, rent, or lease any portion of the software. The right to use the
software terminates automatically if any part of this license is violated.

3
REF 360-0039-01 (B)
TABLE OF
CONTENTS
PREFACE
• Notices ................................................................................................................................... 2
• WARNINGS ............................................................................................................................ 4
• North American & European Certifications ......................................................................... 5
SECTION ONE: INTRODUCTION
• Components .....................................................................................................................6
SECTION TWO: SET-UP
2.1 Preparation ....................................................................................................................... 8
2.2 Pump Start-Up.................................................................................................................. 8
2.3 Setting The Flow Rate.....................................................................................................10
2.4 Display Calibration .........................................................................................................12
2.4.1 Back Pressure Simulation Method Set-Up .......................................................12
2.4.2 Sample Media Method Set-Up ..........................................................................13
2.4.3 Display Calibration Procedure .........................................................................14
SECTION THREE: OPERATION
3.1 Starting The Sample Run ................................................................................................16
3.2 Stopping The Sample Run..............................................................................................17
3.3 Locking The Keypad ......................................................................................................18
3.4 Unlocking The Keypad ..................................................................................................18
3.5 Clearing The Run Data ...................................................................................................19
SECTION FOUR: MAINTENANCE
4.1 Battery Maintenance .......................................................................................................20
4.2 Pump Filter Maintenance ...............................................................................................21
SECTION FIVE: APPENDICES
• Appendix A: Parts List ...................................................................................................22
• Appendix B: Specifications ...........................................................................................23
• Appendix C: Low Flow Adapter ...................................................................................25
• Appendix D: Pulsation Dampener ...............................................................................29
• Appendix E: Service ......................................................................................................31
LIST OF FIGURES
1.1 Gilian 3500 ........................................................................................................... 7
2.1 Power-Up / Ready Mode.......................................................................................... 9
2.2 Setting The Flow Rate..............................................................................................11
2.3 Back Pressure Simulation Method Set-Up ..............................................................12
2.4 Sample Media Method Set-Up .................................................................................13
2.5 Display Calibration Procedure ................................................................................15

4
REF 360-0039-01 (B)
READ AND UNDERSTAND ALL WARNINGS AND INSTRUCTIONS BEFORE USE
Failure to read, understand, and comply with ALL accompanying literature, product labels, and warnings could result in property
damage, severe personal injury, or death.
Read and understand ALL applicable environmental health and safety laws and regulations. Ensure complete compliance with ALL applicable
laws and regulations before and during use of this product.
DO NOT remove, cover, or alter any label or tag on this product, its accessories, or related products.
UNDER NO CIRCUMSTANCES should this product be used except by qualified, trained, technically competent personnel.
DO NOT operate this product should it malfunction, require repair, or have a cracked or broken case. DO NOT repair or modify, except
as specified in Operation Manual. Service to be performed by Sensidyne Authorized Service Departments only.
Use ONLY specified Sensidyne parts when performing maintenance procedures described in this manual. Intrinsic safety certifications
become void by substitution of components, unauthorized repair or alteration.
This product is intended for both indoor and outdoor use when protected from splashed or wind blown liquids. The unit is not
waterproof so NEVER submerge the unit in water. Pump failure or faulting may result.
This product uses rechargeable Nickel-Metal-Hydride batteries. ALWAYS fully charge before use. DO NOT open case, charge or replace
batteriesinaexplosive atmosphere. Use only battery pack and chargers specified in Operation Manual.DONOTinsertanyforeignobjects
into contact slot. Shorting contacts will blow protective fuse. DO NOT operate pump while charging.
If the equipment is likely to come into contact with aggressive substances, then it is the responsibility of the user to take suitable
precautions that prevent it from being adversely affected, thus ensuring that the type of protection is not compromised. Examples of
aggressive substances are acidic liquids or gases that may attack metals, or solvents that may affect polymeric materials. Examples
of suitable precautions are regular checks as part of routine inspections or establishing from material data sheets that it is resistant to
specific chemicals.
DO NOT operate with a dirty or blocked inlet filter or kinked tubing. Pump failure or faulting may result.
Caution: Both charger and battery become warm during charging.
If further translation is required, please contact Goffin Meyvis, the Sensidyne EU Authorized Representative.
WARNINGS

5
REF 360-0039-01 (B)
North American & European Certifications
DEMKO 03 ATEX 0303161
Gilian 3500 intrinsically safe air sampling pump
for use in haz. loc.: Cls I, Div I, Grps A,B, C,D;
Cls II, Grps E,F,G; Cls III. Temp Code T3C.
Gilian 3500 intrinsically safe air sampling pump
for use in haz. loc.: Cls I, Div I, Grps C,D; Cls
II, Grps E,F,G; Cls III. Temp Code T3C.
EEx ib IIB T4
LISTED
17G9 LISTED
C
17G9
0518 II 2 G
CE marking & number of notified
body responsible for production
Explosion protection
II = Equipment Group
2 = Equipment Category
G = Hazardous Gases, vapors or mists
EEx = Explosion Protected equipment in
compliance with CENELEC EN 50014 series
ib = Intrinsic safety protection method
IIB = Gas group
T4 = 135°C, maximum external surface temperature
EC-Type examination
certification number
Class I = Flammable Gases,
Vapors, or Liquids
Division 1 = Ignitable concentrations can
exist all of the time
Group A = Acetelyene
Group B = Hydrogen
Group C = Ethylene
Group D = Propane
Class II = Combustible dusts
Group E = Metal Dust
Group F = Carbonaceous Dust
Group G = Grain Dust
Class III = Ignitable fibers & flyings
Temp Code = T3C (≤160°C)
Class I = Flammable Gases,
Vapors, or Liquids
Division 1 = Ignitable concentrations can
exist all of the time
Group C = Ethylene
Group D = Propane
Class II = Combustible dusts
Group E = Metal Dust
Group F = Carbonaceous Dust
Group G = Grain Dust
Class III = Ignitable fibers & flyings
Temp Code = T3C (≤160°C)
USA CANADA
EUROPEAN ECONOMIC COMMUNITY

6
REF 360-0039-01 (B)
SECTION ONE
INTRODUCTION
• COMPONENTS
See Figure 1.1
(1) Filter Housing Assembly (Inlet Port)
(2) Internal/External Vent Control
Use a flat-head screwdriver to adjust the internal/
external vent. The open circle position will vent
the pump discharge external to the sampler case
(recommended for moist or corrosive sampling
environments). The closed circle will vent
internally (recommended for dust laden
environments).
(3) Belt Clip
(4) Battery Charging Jack (with cover)
(5) 4-button Keypad
(6) Operation LED (Green). Flashes when the pump
is functioning normally.
(7) Liquid Crystal Display (LCD)
(7.1) Ready Mode display alternately shows the
Set Flow Rate, Sample Time, and Total
Volume Sampled. Sampling display
alternately shows the Live Flow, Sample
Time, and Total Volume Sampled.
Also displays “FLO,” “CAL,” “Clr” during
those operations.
(7.2) VOL & L. Shows total volume sampled
(liters).
(7.3) MIN. Elapsed time during sampling.
(7.4) CC/MIN. Displays set flow rate (Ready
Mode) or live flow rate (Sampling Mode).
(7.5) SET. Appears during Set Flow Rate Mode
and Pump Calibration Mode.
(7.6) FAULT. Appears when pump cannot
maintain flow within ±5%.
After fault shutdown pump attempts to
restart every 3 minutes for next hour.
FAULT appears when pump is initially
turned on, but disappears when pump
reaches preset flow rate.
(7.7) HOLD. If, after 30–35 seconds, fault cannot
be corrected, pump stops and HOLD
appears
(7.7) HRS. Shows number of run hours since last
calibration. Pump display must be
calibrated every 200 run hours or every 30
days.
(7.8) Always displayed and is valid 2 minutes
after start-up.
3 bars = High charge
2 bars = Medium charge
1 bar = Low charge
NOTE
The Gilian 3500 automatically calculates the total air
volume sampled using the following formula:
Total Air Volume (Liters) =
Air Flow Rate (cc/min) x Sample Time (minutes)
1000 cc/Liter

GILIAN 3500 AIR SAMPLING PUMP
7
REF 360-0039-01 (A)
Figure 1.1
Gilian 3500
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
6
POWER
ENTER
SET
CAL
CLEAR
RUN/STOP
7
HRS FAULT SET
CC / MIN
VOL
L / MIN
HOLD
CC / MIN
1
2
3
4
5

8
REF 360-0039-01 (B)
SECTION TWO
SET-UP
2.1 PREPARATION
NiMH battery pack must be fully charged (about 5
hours). Refer to Section Four for battery maintenance.
Charge battery pack through built-in jack. Battery
pack may be charged while attached to pump, or
separately.
CAUTIONS & NOTES
Both charger and battery pack become warm during
charging.
Charger switches automatically to trickle mode when
battery is fully charged. DO NOT operate pump while
charger is attached.
Do not short battery terminals. Shorting will blow inter-
nal fuse.
Battery charge icon takes 2 minutes to update when unit
is powered up immediately after charging.
• Internal/External Vent Control
Choose the desired setting per Item #2 in Section One.
• Bag Sampling
The Internal/External Vent Control (#2, Figure 1.1) is
removed from side of unit by removing 2 screws and
replaced with an air boss outlet port.
A sampling bag with tubing is attached to airboss.
2.2 PUMP START-UP
• Power Up (see Figure 2.1)
Press and release POWER button (1).
Start-Up Sequence:
Self Test screen (2)
Version No. screen (3)
Last Cal screen (4)
Screen shows number of run hours since last calibra-
tion.
• Ready Mode
After start-up, pump enters Ready Mode (5).
In Ready Mode display cycles through following
screens:
Flow Rate Set Point (6)
Total Sample Time (7)
Total Volume Sampled (8)
If no buttons are pushed, Ready Mode continues cy-
cling through screens for 75 minutes then turns off.
• Power Down
Press and hold POWER button until unit turns off (3–4
seconds).

GILIAN 3500 AIR SAMPLING PUMP
9
REF 360-0039-01 (A)
Figure 2.1
Power-Up / Ready Mode
6
7
8
1
2 3
CC / MIN
CLEAR
CAL
SET
RUN / STOP
ENTER
POWER
CC / MIN
L MIN
VOL
HOLD
HRS FAULT SET
HRS
MIN
4
5
ENTER
POWER
CAL
SET
CLEAR
READY
MODE
RUN / STOP
VOL
L

GILIAN 3500 AIR SAMPLING PUMP
10
REF 360-0039-01 (A)
2.3 SETTING THE FLOW RATE
NOTE
Thissection is requiredonlyifyou are changingpumpflow
rate. If you’re using previously set flow rate, simply verify
it using a Gilibrator 2 (see Section 2.4.2).
See Figure 2.2
If pump is off press POWER button.
(1) When pump is in Ready Mode, press SET button
once. “FLO” is displayed.
(2) Press ENTER button to begin setting the flow rate.
(3) Press and hold ▲ button to increase flow rate set
point or ▼button to decrease flow rate set point.
(4) When desired flow rate set point is reached press
ENTER button. Elapsed Time and Total Volume will
be cleared.
Go to Section 2.4 to calibrate pump.

GILIAN 3500 AIR SAMPLING PUMP
11
REF 360-0039-01 (A)
Figure 2.2
Setting The Flow Rate
CLEAR RUN / STOP
RUN / STOP
CLEAR
CAL
SET
CAL
SET
CLEAR
CAL
SET
RUN / STOP
CAL
SET
ENTER
POWER
SET
ENTER
POWER
ENTER
POWER
CLEAR
CC / MIN
SET
ENTER
POWER
CC / MIN
SET
RUN / STOP
CC / MIN
MIN
VOL
L
1
24
3

GILIAN 3500 AIR SAMPLING PUMP
12
REF 360-0039-01 (A)
2.4 DISPLAY CALIBRATION
The display should be calibrated at least every 30
days. For optimum accuracy of the displayed flow, it
is also recommended when a new flow is chosen. Use
one of the two set-up methods described in 2.4.1 or
2.4.2 followed by the display calibration procedure in
2.4.3.
2.4.1 Back Pressure Simulation Method Set-Up
• See Figure 2.3
This method uses an orifice to simulate sampling back
pressure and is preferred over the method described
in Section␣ 2.4.2. The back pressure simulation kit
contains all the orifices needed (see Appendix A for
Part No.).
(1) Prepare a Gilibrator 2 using a standard wet cell.
CAUTION
CalibrationwithaPistonCellGilibrator 2(orotherdrycal
device) can lead to erratic results at flow below 2 LPM
due to pulsation. The wet cell version of the Gilibrator 2
is the preferred calibrator.
(2) Choose the orifice closest to desired field flow
rate.
(3) Use 40” of 1/4” ID tubing connected to the pump.
(4) Use 18” of 1/4” ID tubing connected to the
Gilibrator 2.
(5) Attach a 1/4” x 1/8” connector to Gilibrator 2
tubing.
(6) Attach a 1/4” x 1/8” connector to pump tubing.
(7) To each connector attach a 1” length of 1/8” ID
tubing, then connect tubing from pump and
Gilibrator 2 to the precision orifice (orifice
orientation is not important).
Note
Set pump flow rate to match orifice flow rate
(listed in table) even if a slightly different
flow rate is used for actual sampling.
Proceed to Section 2.4.3 for display calibration
procedure.
Figure 2.3
Back Pressure Simulation Method Set-Up
XX
Orifice Selection Table
Orifice
Marking (XX)
Flow Rate
(cc/min)
700
1000
2000
2500
3000
3500
19
24
33
40
43
52
POWER
ENTER
SET
CAL
CLEAR
RUN/STOP
CC / MIN
Gilian 3500Gilibrator 2
7
1
2
34
5 6
2

GILIAN 3500 AIR SAMPLING PUMP
13
REF 360-0039-01 (A)
Figure 2.4
Sample Media Method Set-Up
2.4.2 Sample Media Method Set-Up
• See Figure 2.4
Use this method only if the Back Pressure Simulation
Kit is not available.
(1) Prepare a Gilibrator-2 using a standard wet cell.
CAUTION
CalibrationwithaPistonCellGilibrator 2(orotherdrycal
device) can lead to erratic results at flow below 2 LPM
due to pulsation. The wet cell version of the Gilibrator 2
is the preferred calibrator.
(2) Choose a sample media either the same or of
similar back pressure to that used in the field.
(3) Attach 1/4” ID tubing from pump to media and
from media to Gilibrator-2.
Proceed to Section 2.4.3 for display calibration
procedure.
POWER
ENTER
SET
CAL
CLEAR
RUN/STOP
CC / MIN
OR
Gilian 3500 Gilibrator 2
(Primary) Rotameter (Secondary)
2
1
3
4
0

GILIAN 3500 AIR SAMPLING PUMP
14
REF 360-0039-01 (A)
2.4.3 Display Calibration Procedure
• See Figure 2.5
Before performing display calibration, the pump, must
be set up following Section 2.4.1 or Section 2.4.2.
NOTE
To exit Calibration Mode without changing any values,
simply press ENTER twice. This action will also reset the
hours since last calibration.
If pump is off, press POWER button.
(1) At Ready Mode, press SET/CAL button twice.
(2) Press ENTER button to enter Calibration Mode.
Pump motor also starts running. The set flow rate
is displayed.
(3) Measure flow rate using Gilibrator-2.
NOTE
Actual pump flow rate is displayed on Gilibrator 2.
(4) Adjust pump display to match actual flow rate on
Gilibrator 2. Press and hold ▲button to increase.
Press and hold ▼button to decrease.
(5) When pump display matches Gilibrator 2 display
press ENTER button.
Pump motor continues running. Display changes
to show set flow rate.
(6) Continue to measure live flow rate on Gilibrator 2.
If display does not match measured flow rate
within a few cc’s, you may repeat Steps 4 and 5.
(7) Press ENTER button again to complete calibration.
The pump adjusts its speed to match the new
display value and then stops before returning to
Ready Mode.
NOTE ON FIELD CALIBRATION
The above procedure serves to make internal pump
adjustments and improve the accuracy of the flow display.
It does not replace field calibration as described by OSHA
and NIOSH. A flow verification using the Gilibrator and the
exact field sampling train should be conducted before field
sample. Procedures for field calibration may be referenced
in the NIOSH Manual of Analytical Methods at
www.cdc.gov/niosh or in the OSHA Technical Manual at
www.osha.gov. Figure 2.5 illustrates field calibration set
up.

GILIAN 3500 AIR SAMPLING PUMP
15
REF 360-0039-01 (A)
Figure 2.5
Display Calibration Procedure
2
1
3
5
6
7
FLOW
AVERAGE
SAMPLE #
ccm
ccm
Gilibrator
2
2
Charge
CLEAR
CAL
SET
RUN / STOP
ENTER
POWER
FLOW
AVERAGE
SAMPLE #
ccm
ccm
Gilibrator
2
2
Charge
CLEAR
CAL
SET
RUN / STOP
ENTER
POWER
CLEAR
CAL
SET
RUN / STOP
ENTER
POWER
CLEAR RUN / STOP
CC / MIN
SET
CAL
SET
ENTER
POWER
SET
x 2
CC / MIN
SET
CC / MIN
SET
FLOW
AVERAGE
SAMPLE #
ccm
ccm
Gilibrator
2
2
Charge
CC / MIN
SET
4
CAL
SET
ENTER
POWER
CLEAR RUN / STOP

16
REF 360-0039-01 (B)
3.1 STARTING THE SAMPLE RUN
Make sure pump is fully charged, that flow rate has been properly set, and that the pump has been field
calibrated using actual sampling set-up. Make certain all sample tubing and any sample media have been
properly installed. If pump is turned off press POWER button.
• Press and hold the RUN button [1] until pump motor starts.
• During sampling, pump alternately displays following screens: Live Flow Rate (cc/min) [2], Total Run Time
(min) [3], Total Volume Sampled (liters) [4].
NOTE: Total Run Time and Total Volume Sampled are cumulative from one sample run to the next
unless you reset the flow rate or calibrate the pump. If you want to clear the values before
starting a sample run, see Section 3.5 for instructions on clearing the run data.
CLEAR
CAL
SET
ENTER
POWER
RUN / STOP
1
2
3
4
CC / MIN
L
VOL
MIN
0:00:01
SECTION THREE
OPERATION

GILIAN 3500 AIR SAMPLING PUMP
17
REF 360-0039-01 (A)
3.2 STOPPING THE SAMPLE RUN
• Press and hold the STOP button [1] until pump motor stops.
• Pump alternately displays following screens: Set Flow Rate (cc/min) [2], Total Run Time (min) [3], Total Vol-
ume Sampled (liters) [4].
NOTE
If the pump motor does not stop, go to Section 3.4 to unlock the keypad.
ENTER
POWER
CLEAR
CAL
SET
RUN / STOP
1
2
3
4
MIN
L
VOL
CC / MIN
0:00:03

GILIAN 3500 AIR SAMPLING PUMP
18
REF 360-0039-01 (A)
3.3 LOCKING THE KEYPAD
The keypad can be locked during sampling to prevent tampering. After locking, the unit returns to
normal sampling after 2-3 seconds.
3.4 UNLOCKING THE KEYPAD
After unlocking, the unit returns to normal sampling after 2-3 seconds.
RUN / STOP
CAL
SET
ENTER
POWER
CLEAR
SET
Same Time
0:00:05
0:00:05
RUN / STOP
CAL
SET
ENTER
POWER
CLEAR
Same Time
0:00:05
0:00:05
SET

GILIAN 3500 AIR SAMPLING PUMP
19
REF 360-0039-01 (A)
CC / MIN
CAL
SET
RUN / STOP
ENTER
POWER
CLEAR
0:00:08
MIN
VOL
L
3.5 CLEARING THE RUN DATA
• If the pump is off press POWER button.
• Wait until Ready Mode, then press and hold CLEAR button for 8 seconds.
NOTE
If you remove the battery pack all stored data will be lost. However, if you turn off the unit using the POWER button while in
Ready Mode, all data will be saved.

20
REF 360-0039-01 (B)
SECTION FOUR
MAINTENANCE
4.1 BATTERY MAINTENANCE
NOTE
Do not charge or replace battery pack while
in an explosive atmosphere.
T he Gilian 3500 pump uses rechargeable Nickel-Metal-
Hydride batteries that must be fully charged and properly
maintained for maximum run time. The battery pack is
rated at 4.8 Volts (2.2 Ampere-hour) with a charge time
under 5 hours. Battery pack may be charged separately
or while on the pump.
Make certain charger plug is fully inserted into jack on
battery pack (see Figure 1.1, #4 for charger jack
location). If not fully inserted, charger LED will flash
Red or be off.
Charger LED is Red during normal charging and
Green during trickle charge.
After charging is complete, make certain the rubber
jack cover is plugged back into the charging jack to
protect the jack during operation.
CAUTIONS & NOTES
Both charger and battery pack become warm during
charging.
Charger switches automatically to trickle mode when
battery is fully charged. DO NOT operate pump while
charger is attached.
Do not short battery terminals. Shorting will blow inter-
nal fuse.
Battery charge icon takes 2 minutes to update when unit
is powered up immediately after charging.
A ll NiMH batteries lose charge when not in use. If battery
pack has not been charged for 3-4 days, recharge battery
before use. This ensures that batteries are fully charged just
prior to sampling. NiMH batteries stored for extended time
periods should be recharged every 1-2 months to avoid
complete discharge.
Battery pack has an estimated life of 300–500 charge/
discharge cycles, depending on use. Table below shows
estimated battery life based on usage level.
Pump Usage Weekly Use Est. Battery Life
High ......................... 40-60 hrs ................. 1.0-1.5 yrs
Medium .................... 20-39 hrs ................. 1.5-2.5 yrs
Low .......................... < 20 hrs ................... 2.5 yrs