Arizona Instrument JEROME 431-X User manual

AZI P/N 700-0046-F
Last update September 2017
USER MANUAL
JEROME®431-X
MERCURY VAPOR ANALYZER
OPERATION MANUAL
September 2017
ARIZONA INSTRUMENT LLC
3375 N Delaware Street | Chandler, AZ 85225 USA
800.528.7411 | 602.470.1414 | f 602.281.1745
www.azic.com
Email:
General – [email protected]
International – [e-mail]
Customer Service – su[email protected]

AZI Customer Service 800-528-7411 or 602-470-1414 Page 2 of 56
JEROME®431-X
Mercury Vapor Analyzer
Operation Manual
PROPRIETARY RIGHTS NOTICE
This manual contains valuable information and material developed by Arizona Instrument LLC
for use with the Jerome®431-X Mercury Vapor Analyzer. No part of this manual can be
reproduced or transmitted in any form or by any means, electronic, mechanical or otherwise.
This includes photocopying and recording or in connection with any information storage or
retrieval system without the express written permission of Arizona Instrument LLC.
ALL RIGHTS RESERVED
Copyright 1990-2017 Arizona Instrument LLC
Resisorb®is a registered trademark of Avantor Performance Materials.
AddSorb®is a registered trademark of Jacobi Carbons.
Tygon®is a registered trademark of Norton.

AZI Customer Service 800-528-7411 or 602-470-1414 Page 3 of 56
Table of Contents
1. FOR THOSE WHO CAN'T READ THE WHOLE MANUAL NOW................................................5
2. INTRODUCTION ...................................................................................................................................7
3. PRINCIPLE OF OPERATION..............................................................................................................8
Zero Air Filter ............................................................................................................................................9
4. INSTRUMENT OPERATION...............................................................................................................10
LCD Codes.................................................................................................................................................10
Daily Operations.........................................................................................................................................11
Sensor Regeneration...................................................................................................................................12
Zero Adjust.................................................................................................................................................13
Sample Mode..............................................................................................................................................14
Survey Mode ..............................................................................................................................................15
Operating on AC Power or Generator........................................................................................................16
Operating on Internal Battery Power..........................................................................................................16
External battery power ...............................................................................................................................16
Charging Batteries......................................................................................................................................17
Obtaining Maximum Battery Life..............................................................................................................17
5. MAINTENANCE.....................................................................................................................................18
Preventive Maintenance Calendar..............................................................................................................18
Flow System...............................................................................................................................................19
.25 inch Fritware Filter........................................................................................................................19
Internal Filters .....................................................................................................................................20
Replacing the Battery Pack ........................................................................................................................21
Setting the Input Voltage and Frequency ...................................................................................................21
Display Nanograms or Milligrams Per Cubic Meter..................................................................................22
Changing the Fuse......................................................................................................................................22
6. CALIBRATION.......................................................................................................................................23
Verification of Functionality and Quality Control .....................................................................................23
7. 431-X TROUBLESHOOTING...............................................................................................................24
8. JEROME®431-X TECHNICAL SPECIFICATIONS .........................................................................27
Optional Communications Capability ........................................................................................................27
Instrument I/O Interface.............................................................................................................................28
Potential Interferences................................................................................................................................29
9. ACCESSORIES & MAINTENANCE PARTS.....................................................................................30
Spare Parts..................................................................................................................................................32
10. FACTORY CALIBRATION SERVICE ...............................................................................................36
11. APPENDIX A - 431-X FUNCTIONAL TEST KIT..............................................................................37
Preparation..................................................................................................................................................37
Mercury Transfer........................................................................................................................................38
Replacing Mercury.....................................................................................................................................38
Functional Test Procedure..........................................................................................................................39
Syringe Technique......................................................................................................................................40
431-X Temperature Conversion Chart .......................................................................................................41
Functional Test Troubleshooting................................................................................................................42
12. APPENDIX B - INTERNAL DIP SWITCH SETTINGS.....................................................................43
13. APPENDIX C - JEROME®COMMUNICATIONS SOFTWARE.....................................................44
JCS Kit Contents ........................................................................................................................................45
System Requirements.................................................................................................................................45
Data Logger Option....................................................................................................................................45
14. APPENDIX D - JEROME®431-X OPTION FUNCTIONALITY......................................................46
Auto-Zero...................................................................................................................................................46
Instrument Zeroing.....................................................................................................................................47
Timed Regeneration ...................................................................................................................................48

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Auto-Sample...............................................................................................................................................48
4-20 mA Analog Output.............................................................................................................................49
Connection and Setup:.........................................................................................................................50
Fresh Air Solenoid......................................................................................................................................52
DC Power Operation ..................................................................................................................................53
DC Power Adaptor Kit, AZI P/N Y031 0902 .....................................................................................53
15. WARRANTY...........................................................................................................................................55
An up-to-date electronic copy of this manual can be found at:
http://www.azic.com/downloads.aspx

AZI Customer Service 800-528-7411 or 602-470-1414 Page 5 of 56
1. FOR THOSE WHO CAN'T READ THE WHOLE MANUAL NOW
This manual contains details that will optimize the results and the life of your instrument. Read
and refer to the manual for complete details on operation, maintenance and troubleshooting,
special voltage inputs and data output.
The Jerome®431-X is easy to operate and ready for use upon receipt from the factory.
•Remove the instrument from the packing material.
Retain all packaging materials for any future shipment of the
instrument.
If the instrument is returned to AZI for any reason, it must be
placed in the original packaging materials that have been tested
and proven to be effective protection during shipment.
•Call AZI Customer Service at 800-528-7411 or 602-470-1414 for Return Material
Authorization (RMA) information prior to returning a unit.
•For all shipments, boxes and packing materials are available from AZI.
•Pack the Jerome®instrument only in a Jerome®shipping container.
AZI WILL NOT BE RESPONSIBLE FOR SHIPPING DAMAGE.
IF YOU RETURN THE INSTRUMENT IMPROPERLY PACKAGED OR
SHIPPED,
YOU SHOULD INSURE IT FOR FULL VALUE.
•Check for any damage and confirm receipt of all parts on
your packing list. Contact Arizona Instrument Customer
Service at [phone] or [phone] if you have
any questions.
•Press the ON button. The display should read 000 in less
than one second.
A LO BAT message appears briefly in the upper left
corner.
If the LO BAT message persists, recharge the battery.
See page 17.
•Check the voltage setting (110 or 220 VAC) on the back of the
instrument. Ensure that it is set to the correct voltage. If the
pointer is not aligned to the local voltage, turn the selector to
point to the correct voltage.

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•Perform a sensor regeneration by following these steps:
Connect the line cord between the connector on the back of the 431-X and an AC power
outlet.
Press the ON switch and then press the REGEN button.
The instrument will begin a 10 minute regeneration cycle, indicated by .H.H.H
flashing on the display. Do not interrupt this cycle. For a complete description of
this process, see page 12.
If any error message, such as .P.P.P, appears on the display, see the
“Troubleshooting” section beginning on page 24.
•When regeneration is complete, zero the sensor by pressing the ZERO button and turning
the zero adjust screw, located under the handle, until the display reads 0.
•The instrument is now ready to sample.
•To ensure the input to the instrument contains no Mercury Vapor or mercaptans, use a
Zero Air Filter, AZI P/N Z2600 3905. The Zero Air Filter cleans the air sample and
should produce sample readings of less than 0.003 mg/m3. Therefore, use the filter to:
Equilibrate the instrument to temperatures that are higher or lower than the instrument.
Sample with filter installed until the reading is below 0.003 mg/m3.
Identify contamination within the unit.
Confirm the presence of Mercury Vapor when readings are elevated. Install filter and
verify that the readings go down with filter installed.
•When the instrument measures Mercury Vapor, the zero display will be replaced with a
value.
CAUTION
Do not adjust the ZERO after the instrument has measured Mercury Vapor
or before the next regeneration. (Occasionally the display may drop to
.L.L.L (indicating low) between the initial zeroing and the first sample. It is
OK to readjust the ZERO if the instrument has not measured Mercury
Vapor.)
•The instrument is designed for ambient air monitoring. DO NOT allow the probe or the
instrument’s intake to be exposed to any liquid.
•The instrument is not explosion proof.
•Press the SAMPLE button to start a 12 second sampling cycle.
•Perform sensor regeneration after each day’s testing.
•Perform another sensor regeneration and re-zero the instrument before each day’s use.
•Perform sensor regeneration after 30 days of storage or inactivity.
Note: There are two different versions of the 431-X, and they can be distinguished by a small
‘SMV’ label located above the serial label on the back of the instrument. In this manual, when it
is necessary to distinguish between the two versions, they are referred to as ‘SMV’ instruments
or ‘Non-SMV’ instruments. Check for the ‘SMV’ label on your instrument to determine which
steps apply to your instrument. ‘SMV’ instruments can be purchased with the Option
Functionality and/or the Data Logger Functionality if desired.
Call AZI Customer Service, at [phone] from the United States and Canada or (602)
470-1414 if you have any questions. If you prefer, you may send e-mail to
[e-mail]

AZI Customer Service 800-528-7411 or 602-470-1414 Page 7 of 56
2. INTRODUCTION
The Jerome®431-X Mercury Vapor Analyzer is an ambient air analyzer with a range of 0.001 to
.999 milligrams of mercury vapor per cubic meter (mg/m3Hg).
CAUTION:
The Jerome®431-X is for vapor use only.
DO NOT allow the probe or the instrument's intake
to be exposed to any liquid, dust
or other foreign material.
The 431-X is designed to be easy to operate for quick and accurate analysis of mercury vapor
levels. It has few maintenance requirements. However, please take a moment to read this
manual before attempting operation. If you have any questions about your application or
operation, please call AZI Customer Service at [phone] or [phone] or e-mail
[email protected] for assistance.
431-X Features
•Automatic sensor regeneration when equipped with the communications option and used
with the Jerome®Communication Software (JCS) program and the Jerome®Data Logger.
•Regulated film heat voltage during sensor regeneration. This allows the sensor to clean
properly with voltages from 100-130 VAC (or 200-260 VAC).
•Survey mode can be locked in.
•DIP switch setting can change the digital meter readings from mg/m3Hg to nanograms
(ng) of Hg (see page 22).
•The Jerome®431-X can be operated from 100-130 or 200-260 VAC. To change the
default voltage range, refer to Setting the Input Voltage, page 21.
Accessories and Maintenance Parts
The Accessories and optional items available to support the 431-X are listed and pictured
beginning on page 30.

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Applications
•Ambient air analysis
•Regulatory compliance
•Quality assurance and quality control
•Scrubber efficiency testing
•Accuracy check for other Mercury Vapor monitors and control systems
•Mercury Vapor source detection
•Leak detection
•Portable Mercury Vapor detection
The Jerome®431-X can be operated from 100-120 or 200-240 VAC. To change the default
voltage range, See “Setting the Input Voltage” on page 21.
3. PRINCIPLE OF OPERATION
A thin gold film, in the presence of Mercury Vapor, undergoes an increase in electrical resistance
proportional to the mass of Mercury Vapor in the sample.
When the SAMPLE button is pressed, an internal pump pulls ambient air through a scrubber
filter and into the flow system.
After 2 seconds, the sample solenoid bypass opens, closing off the scrubber filter from the flow
system.

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The sample air passes through a filter (removing any acidic gases which interfere with the
sensor's response to mercury) and is drawn over the gold film sensor. The sensor absorbs the
Mercury Vapor. Nine seconds after starting, the sample solenoid bypass closes and the
remainder of the sample is drawn through the scrubber filter and the flow system. The
instrument determines the amount absorbed and displays the measured concentration on the
digital meter in milligrams per cubic meter (mg/m3) of mercury. An internal DIP switch can be
used to change the digital meter display from mg/m3to nanograms of mercury (see page 22).
The instrument’s microprocessor automatically re-zeroes the digital meter at the start of each
sample cycle and freezes the meter reading until the next sample cycle is activated, thus
eliminating drift between samples.
During the sample mode cycle, bars on the LCD represent the percentage of sensor saturation.
Depending on the concentrations, approximately sixty-five samples containing 0.1 mg/m3 Hg
may be taken before the sensor reaches saturation. After absorbing approximately 500
nanograms of mercury, the sensor becomes saturated and needs to be cleaned. This is
accomplished by a manually activated 10-minute heat cycle, or sensor regeneration that burns the
mercury from the sensor. This mercury is absorbed on internal filters to prevent any external
contamination. The solenoid bypass closes during the sensor regeneration cycle, causing the air
to pass through the scrubber filter, providing clean air for the regeneration process. The flow
system's final scrubber prevents contamination to the atmosphere from the desorbed mercury.
The heat generated during the regeneration may cause some low level thermal drift. To ensure
maximum sample accuracy, wait 30 minutes after regeneration before zeroing and using the
instrument.
Zero Air Filter
The Zero Air Filter removes mercury vapor, mercaptans, and hydrogen sulfide from the air
sample. Readings with the filter installed should be near zero.
Because air that is cooler than the instrument will cause low readings and warmer air will cause
higher readings, the Zero Air Filter should be used to equilibrate the unit to ambient air.
Continuous sampling with clean air will not cause saturation of the gold film sensor but will
equalize temperatures faster to allow accurate analysis to begin sooner.
The Zero Air Filter can also be used to identify contamination within the instrument. If the
readings do not reduce to near zero with the filter installed, contamination should be suspected.
If the readings do drop to near zero with the filter installed but elevate with the filter removed,
the presence of Mercury Vapor at the sampled location is confirmed.
For more information on the use of the Zero Air Filter, contact customer service at 1-800-528-
7411, 1-602-470-1414, or visit our web site at http://www.azic.com.

AZI Customer Service 800-528-7411 or 602-470-1414 Page 10 of 56
4. INSTRUMENT OPERATION
LCD Codes
LCD CODE EXPLANATION
000 Ready to sample
.000 No Mercury Vapor reading
00.0 No Mercury Vapor reading, display in nanograms
.8.8.8 Sensor saturated-regeneration needed (refer to page 12)
.H.H.H Sensor regeneration in progress (.H.H.H flashes)
.L.L.L Re-zero needed (refer to page 13)
.P.P.P Power cord required or low line power, <100 VAC (or 200 VAC)
(see pages 16 and 17, Changing the Fuse, if .P.P.P remains on after
the cord is connected.)
.H.L.P High line power, greater than 130 VAC in 110 operation or 260
VAC in 220 operation
.LO BAT Recharge batteries (refer to page 17)
.E.E.E Same as LO BAT, automatically shuts off
.HL Very high concentration has been detected. Refer to your safety
policy for additional direction to confirm the concentrations."
DURING SAMPLING
.- 0-25% sensor saturation
.-- 25-50% sensor saturation
.--- 50-75% sensor saturation
-.--- 75-100% sensor saturation
DURING SAMPLING, USING SURVEY MODE
- Survey sampling (minus sign flashes continuously)
WHEN ZERO IS
DEPRESSED Adjust to 0 only after sensor regeneration. It is normal for the display to read H after sampling has started.
0 Zero, ready to sample
H High, turn Zero potentiometer counterclockwise
L Low, turn Zero potentiometer clockwise

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Daily Operations
Before each day's use of the Jerome®431-X, perform the following steps to verify proper
instrument operation:
•Press the power ON button.
The digital meter displays 000.
(Disregard the digital meter's initial
momentary reading.)
Recharge or replace the battery pack if
the LO BAT indicator REMAINS ON.
Refer to “Charging Batteries” on page
17 and/or “Replacing the Battery
Pack” on page 21.
To ensure the instrument's electronics
have stabilized, allow a 1-minute
warm up before beginning the next
step.
•Use the Zero Air Filter to equilibrate the
instrument to ambient air temperature.
Install the Zero Air Filter in the instrument’s intake.
Sample continuously until the readings stabilize.
•Perform sensor regeneration. Refer to page 12 for the procedure.
•Thirty minutes after sensor regeneration is complete, zero the instrument.
NOTE: For maximum accuracy, such as when testing with the Functional Test
Kit, wait 30 minutes after the sensor regeneration cycle to re-zero the unit. For
immediate use, the unit can be re-zeroed immediately after sensor regeneration.
•Press the SAMPLE button.
During the sample cycle, the digital meter displays bars (-, --, or ---) to indicate the
amount of sensor saturation.
•At the end of the sampling cycle, read the digital meter.
The number shown on the digital meter is the Mercury Vapor concentration in mg/m3.
This value remains on the display until the next sample is taken.
The digital meter automatically zeroes at the start of each sample.
•At the end of each day's use, perform sensor regeneration as described in the next section.
DO NOT ALLOW MERCURY VAPOR TO STAY ON
THE GOLD FILM SENSOR OVERNIGHT.

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Sensor Regeneration
Sensor regeneration is needed to clear the 431-X sensor of any accumulated Mercury Vapor and
to prolong the life of the sensor. This simple procedure should be done:
•At the beginning of the day on which the instrument is to be used.
•During the day when the sensor becomes saturated.
•At the end of the day before storing the instrument.
•At a minimum of 30 day intervals while the instrument is in storage.
CAUTION:
Ensure the voltage selector on the back of the instrument, near the power
cord inlet connector, points to the local AC power value. See “Setting the
Input Voltage” on page 21.
To clean and protect the sensor, the supplied AC power must be 100 to 120
VAC or 220 to 240 VAC, depending on the available power source.
Once sensor regeneration is initiated, DO NOT interrupt the cycle.
•Attach the power cord to the 431-X and plug it into AC power. AC power is required to
thermally regenerate the sensor.
•Press the power ON button.
•Press the REGEN button.
The digital meter flashes .H.H.H for the duration of the 10-minute cycle and displays
.0.0.0 when the cycle is completed.
DO NOT INTERRUPT THIS CYCLE.
Wait until the cycle is completed before continuing with the next step.
•A minimum 30-minute wait after the sensor regeneration cycle is complete ensures
maximum sample accuracy. However, the unit can be used immediately following the
sensor regeneration if necessary. When the sensor regeneration is complete, press
ZERO and adjust the ZERO ADJUST pot until 0 appears on the display. Install the
zero air filter in the intake and take several samples or lock the instrument into survey
mode (see page 15). After approximately one minute, stop sampling and check the
ZERO. Adjust to 0. Repeat sampling through the zero air filter until reading remains
on 0.
NOTE: The digital meter will read .P.P.P after REGEN is activated if the power cord is not
plugged in or if the instrument's fuse needs to be replaced. Connect the power cord, or if
necessary, replace the fuse. See “Changing the Fuse” on page 22.

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Zero Adjust
•To ensure air entering the instrument is
clean, install the zero air filter in the
instrument’s intake and sample until the
readings stabilize.
•While pressing the ZERO button, turn the
ZERO ADJUST potentiometer (shown at
right) using the trimmer tool until the
digital meter reads 0.
If the LCD reads H, turn the ZERO
ADJUST counter-clockwise;
If the LCD reads L, turn the ZERO
ADJUST clockwise.
NOTE: A minimum 30-minute wait after the sensor regeneration cycle is
complete ensures maximum sample accuracy. The unit can be used
immediately following the sensor regeneration if necessary. When the sensor
regeneration is complete, press ZERO and adjust the ZERO ADJUST pot until
0 appears on the display. Install the zero air filter in the intake and take several
samples or lock the instrument into survey mode (see page 15). After
approximately one minute, stop sampling and check the ZERO. Adjust to 0 if
necessary. Repeat sampling through the zero air filter until sensor remains
on 0.
NOTE: When ZERO is pressed, depending upon internal configuration, a
number between 00 and 100 may appear on the display instead of H, L, or O.
See APPENDIX B - INTERNAL DIP SWITCH SETTINGS on page 43 for
details. If the instrument is configured with Option Functionality, see
APPENDIX D - JEROME®431-X OPTION FUNCTIONALITY beginning
on page 46.
CAUTION:
Do not turn the ZERO ADJUST potentiometer between samples.
Turn the ZERO ADJUST only after a sensor regeneration cycle otherwise
invalid readings will result.
•Press the power OFF button and disconnect the power cord.
•The Jerome®431-X is ready for sampling.
CAUTION:
The Jerome®431-X is intended for vapor use only. DO NOT
allow the probe or the instrument's intake to be exposed to
liquids, dust or other foreign material. Moisture or liquids
drawn into the instrument can damage the sensor and flow
system.

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Sample Mode
This mode, used for standard operation, produces optimum accuracy (±5% at 0.100 mg/m3Hg)
with the Jerome®431-X.
•Press the power ON button.
The digital meter displays 000. If the unit is set to display in ng, the digital meter
displays 00.0. (Disregard the digital meter's initial momentary readings.) Recharge or
replace the battery pack if the LO BAT indicator REMAINS ON. Refer to pages 17
and/or 21 for the procedure.
•To ensure the instrument's electronics have stabilized, allow a 1 minute warm up before
beginning the next step.
•Press the SAMPLE button.
During the sampling cycle, the bar (or bars) shown on the digital display indicate the
current percentage of sensor saturation. (Refer to Meter Display Codes, page 10, for
code descriptions.)
The bar (or bars) flash after 2 seconds and again after an additional 7 seconds. This
flashing signals the opening and closing of the solenoid sample bypass. (See the
Principles of Operation on page 8 for details.)
•At the end of the 12 second cycle, read the digital meter.
The number shown on the digital meter is the mercury concentration in mg/m3(or ng).
This value remains displayed until the next sample is taken. The digital meter
automatically zeroes at the start of each sample.
•When the sensor is completely saturated, the digital meter displays .8.8.8 instead of a
value. No further operation is possible until a sensor regeneration is performed. (Refer to
page 12 for the Sensor Regeneration procedure.)
•Press the power OFF button when not in use. Install the zero air filter in the instrument
intake during storage.
Sampling Notes
The Jerome®431-X is intended for vapor use only. DO NOT allow the probe or the instrument's
intake to come in contact with liquids, dust or other foreign material. Moisture or liquids drawn
into the instrument can damage the sensor and flow system.
The Jerome®431-X operates a minimum of 6 hours on a fully charged battery.
Use the probe (AZI P/N1400-2002) to locate mercury vapor in hard to reach places. Plug the
probe directly into the instrument's intake.

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Survey Mode
The survey mode takes samples every 3 seconds automatically. Use this mode to locate mercury
spills or to assess areas of potentially high mercury concentrations. Sampling in the survey mode
is not as accurate. Due to the decreased sample volume, the accuracy of the instrument is
reduced to ± 20% @ .100 mg/m3.
•Press the power ON button.
The digital meter displays 000. If the unit is set to display in ng, the digital meter
displays 00.0. (Disregard the digital meter's initial momentary readings.) Recharge or
replace the battery pack if the LO BAT indicator REMAINS ON. Refer to pages 17
and/or 21 for the procedure.
To ensure the instrument's electronics have stabilized, allow a 1 minute warm up before
beginning the next step.
•Press and hold the SAMPLE button.
The instrument takes a normal 12 second sample, displays the concentration at the end
of the cycle and then goes into the survey mode sampling every 3 seconds. The display
flashes the measured concentrations at the end of each 3 second sample cycle.
•When you are finished surveying, release the SAMPLE button.
The final survey value remains displayed until the next sample is taken.
NOTE:Approximately 65 samples at .1 mg/m3may be taken before a sensor regeneration is
required.
•To lock the instrument in a survey mode:
Hold the SAMPLE button down until the sensor status indicator bar(s) "_" begins
flashing on the display.
Press the ZERO button, then release the SAMPLE button.
The pump should continue to run and the display should update every 3 seconds.
The instrument remains in the survey mode until one of the following occurs:
The sensor is saturated
A LO BAT (low battery) signal is encountered
An HL (high mercury level) is encountered
The instrument is turned OFF.
Press the power OFF button when not in use.

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Operating on AC Power or Generator
•For stationary use, the 431-X may be operated on AC power.
Operating the instrument on AC power at all times eliminates the need for the battery
pack and its necessary maintenance.
The battery may be unplugged or removed completely whenever the instrument is
operating on AC power.
•When a generator is used to power the Jerome®431-X, a high quality line conditioner or
voltage regulator is required to ensure a pure sine wave and regulated voltage is applied to
the instrument. The gold film sensor may be damaged by voltage that varies in amplitude
or by surges, spikes, and/or noise on the power line. This is especially true during the
sensor regeneration.
Operating on Internal Battery Power
For portable use, the 431-X may be operated on Battery power.
•When you operate the instrument on battery power, please be aware of the following:
A fully charged battery pack, AZI P/N Z4000-0907, provides power for a minimum of
six (6) hours of operation.
For operating more than six (6) hours, an extra fully charged battery pack is needed.
Complete battery recharging takes 14 hours. Refer to Charging Batteries on page 17.
The 431-X uses a rechargeable Nickel Cadmium (NiCad) battery. Dispose of worn-out
batteries properly when you are replacing the battery pack.
External battery power
A special version of the Jerome®431-X and a DC Power Kit are available to operate the
instrument from a secondary DC source. The source may be a car/truck battery or a storage cell
used in conjunction with solar panels.
Call AZI Customer Service at 800-528-7411, 602-470-1414, or e-mail [e-mail] for
additional information.

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Charging Batteries
•Press the power OFF button.
•Connect the AC power cord between the 431-X power receptacle and an AC power
source.
Complete battery recharging takes 14 hours.
The 431-X contains a trickle charger so it may be continually plugged into an AC power
source without damaging the battery pack.
•The battery pack may be charged outside the instrument with an optional AZI IDC Battery
Charger. (AZI P/N 4000-1011, for 115 VAC, P/N 4000-1012, for 230 VAC)
Obtaining Maximum Battery Life
There are certain inherent limitations to NiCad batteries. The primary limitation is a memory
effect that occurs when the batteries are partially discharged and then recharged, repeatedly.
This memory leads to a drastic reduction in the usable battery life. To prevent this memory
effect, periodically allow the battery pack to discharge completely, and then recharge the battery
pack.
•To obtain maximum battery life, follow these three (3) steps:
At least once a month wait until LO BAT appears on the digital meter before recharging
the battery pack.
Charge the battery pack when the LO BAT indicator comes on. Excessive discharge can
damage the battery pack.
Before storing the instrument verify the power is OFF.
•When the batteries fail to hold a charge, the battery pack should be replaced.
Battery life under normal usage is approximately 1 year, depending on the number of
charge and discharge cycles.

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5. MAINTENANCE
Preventive Maintenance Calendar
To keep the Jerome®431-X operating at peak performance, follow the maintenance schedule
below as a guide. Since maintenance is more a function of application and amount of use rather
than time, your requirements may be different from the listed schedule. Call AZI Customer
Service at 800-528-7411, 602-470-1414, or e-mail [email protected] for additional guidance for
your environment and operation.
PART/COMPONENT MAINTENANCE CYCLE REFER TO
PAGE
Charge batteries
At least once per month, after 1 month's storage,
or when LO BAT appears
Page 17
Change .25 inch fritware
Weekly or as needed
Page 19
Change internal filters and
tubing
1
After 6 months of use or as needed Page 20
Replace zero air filter2
Annually
Factory calibration
Annually
Page 23
Functional check Monthly or as needed
Appendix
A, Page 37
Replace batteries
Annually or as needed.
The battery pack contains NiCad batteries.
Dispose of properly.
Page 21
NOTE: Install the zero air filter into the instrument's intake during storage.
1C/M filters contain Sofnolime ™. For safety information see the supplier’s Safety Data Sheet (SDS) or call AZI
Customer Service at 800-528-7411, 602-470-1414, or e-mail [e-mail] for a copy. Dispose of all filters
properly.
2Zero air filters and scrubber filters contain Resisorb®or AddSorb®VA13. For safety information see the
supplier’s Safety Data Sheet (SDS) or call AZI Customer Service at 800-528-7411, 602-470-1414, or e-mail
[e-mail] for a copy. Dispose of all filters properly.

AZI Customer Service 800-528-7411 or 602-470-1414 Page 19 of 56
Flow System
The Jerome®431-X's flow system is the crucial link between the sensor and the sample. For the
instrument to perform correctly, the flow system must be properly maintained. The user
maintainable components of this system are the intake filter (.25 inch fritware), a C/M Filter, two
scrubber filters and connecting tubing.
Check the Preventive Maintenance Calendar on page 18, for a suggested schedule for changing
fritware and scrubber filters. The Tygon™ tubing in the system must be free of crimps for
proper flow.
Part
Part Number
Scrubber Filter
Z2600 3930
C/M Filter
Z2600 3928
.25 inch Fritware Filter
2600 3039
Tygon™ Tubing - 1/8" I.D. (1')
2500 3001
.25 inch Fritware Filter
Replace the .25 inch fritware filter once each week or as needed. In dusty environments, the
fritware filter may need to be replaced as often as once a day. Replacement .25-inch fritware
filters are available from AZI, Consumable Sales at 800-528-7411 or 602-470-1414.
•Unscrew and remove the intake.
•Push the old fritware filter disc out of the intake with your
trimmer tool.
•Avoid touching the new fritware disc with fingers. Use
tweezers to insert the new fritware.
•Use the blunt end of the trimmer tool to seat the fritware disc
firmly against the inner ledge of the intake.
•Screw the intake back on the Jerome®431-X.
CAUTION:
The stem coming from the instrument onto which the outer intake housing
is attached must be securely held in place. If loose, the tubing inside the
instrument can become twisted when the intake housing is replaced. It may
be necessary to open the instrument and tighten the hold-down nuts inside
the instrument. Call AZI Customer Service at 800-528-7411, 602-470-1414,
or e-mail [email protected] if you have any questions

AZI Customer Service 800-528-7411 or 602-470-1414 Page 20 of 56
Internal Filters
•Replace the internal filters after six (6) months of use, or as needed.
•Press the power OFF button and unplug the power cord.
•Remove the two (2) side screws from the intake end of the instrument and open the case.
•Carefully disconnect the Tygon tubing from both ends of the filters and discard the old
filters.
CAUTION:
Filters contain either Sofnolime™, Resisorb®or AddSorb®VA13. Used
filters will contain trace amounts of Mercury also. Use proper methods
when disposing of used filters. Call AZI Customer Service at 800-528-
7411, 602-470-1414, or e-mail suppo[email protected] for a copy of the
Resisorb®, AddSorb®VA13 or Sofnolime™ SDS or for other questions.
•Connect the new filters to the Tygon tubing, ensuring all straight hose barbs point toward
the intake/pump corner of the case and elbow hose barbs point toward the sensor housing
as shown in the illustration.
Push the Tygon as far as it will go onto the filter fittings.
•Push the filters into the mounting clips.
•Remove any crimps or twists in the tubing and ensure that tubing connections are secure.
If the tubing is loose, readings may not be accurate. Replace any tubing that has
deteriorated due to heat and/or age.
•Close the case and replace the screws.
•Dispose of all filters in accordance with state and federal environmental regulations.