SKC Limited Universal MTX Pump Operating Instructions

Universal Air Sampling Pump

This manual covers the following models:

224-44MTX, 224-PCMTX4, 224-PCMTX8

www.skcltd.com

Operating Instructions

Purchase Details and Service History

Thank you for choosing an SKC product. Your purchase is covered by our warranty, details of which can be
found inside the rear cover of this manual.

Product Model Number Product Serial Number Date of Purchase

SKC recommends annual servicing of this product. The first service is due one year from the date of purchase,
and then at yearly intervals on this date.

Service Date Service Date Service Date

1 5 9

2 6 10

3 7 11

4 8 12

Please note that SKC Ltd are the only authorised service centre in the UK, guaranteeing you access to the full
range of genuine SKC replacement parts. For all other areas a full list of SKC approved distributors and service
centres can be found at www.skcltd.com

SKC UK service centre - Tel: [phone] Fax: [phone] Email: [e-mail]

Page 2 224-UMTXM Issue F www.skcltd.com

Contents

Intrinsic Safety Information .............................................................................................................................2

Specifications ................................................................................................................................................3

General Information .......................................................................................................................................6

Diagram of the Universal MTX Pump .............................................................................................................8

Pump Controls Layout .................................................................................................................................10

Getting Started ............................................................................................................................................11

Operating the Timer (224-PCMTX8 Only) ..................................................................................................... 14

Low Flow Sampling .....................................................................................................................................18

Troubleshooting ...........................................................................................................................................20

Care of the Battery Pack ..............................................................................................................................22

Universal MTX Pump Components ..............................................................................................................24

Universal MTX Pump Replacement Parts .....................................................................................................25

Universal MTX Pump Accessories................................................................................................................26

Intrinsic Safety Certification ..........................................................................................................................28

Warranty Information ...................................................................................................................................34

www.skcltd.com 224-UMTXM Issue F Page 1

Intrinsic Safety Information

The Universal MTX pump range

• Complies with the EC ATEX Directive 94/9/EC on equipment intended for use in potentially explosive
atmospheres, as intrinsically safe to EEx ia IIC T4, for use in Europe.

• The equipment may be used in zones 1 and 2 with flammable gases and vapours with apparatus groups

II

A, IIB & IIC and with temperature classes T1,T2,T3,T4.

• The equipment is only certified for use in ambient temperatures in the range -20 to +40°C and should not
be used outside this range.

• The battery pack should not be charged in a hazardous area.

• Use only SKC approved chargers designated for the model.

• The equipment has not been assessed as a safety related device (as referred to in Directive 94/9/EC

Annex II, clause 1.5).

• The equipment should not be used if damaged in a way that could invalidate intrinsic safety. Such
defects might include cracking of the battery pack enclosure and internal encapsulant such that internal
components or cells are exposed.

Important note about intrinsic safety

If you are unsure as to whether the Universal pump you have purchased is suitable for your environment, check
with your site manager or responsible person BEFORE USE that the intrinsic safety rating on the product meets
your site requirements. SKC personnel are unable to recommend the appropriate safety rating for your site.

Page 2 224-UMTXM Issue F www.skcltd.com

Specifications

All models

131mm 57mm

• Weight: 915 g

• Casing IP rating: IP20

• Operating range: 5 - 4000 ml/min (5 - 500 requires adapter)

• Flow control: ±5% set point constant flow

• Flow indicator: Scale range 0.5 - 5.5 l/min

• Battery pack: NiMH rechargeable, 2.0 Ah, 4.8 V

133mm

• Storage & operating temperature: -20°C to +40°C

• Operating humidity: 0 to 95% RH

• Compensation range:

Flow rate

(l/min)

1 5 - 30
2 0 - 25
3 0 - 20
4 0 - 10

Back Pressure

(inches of water)

Typical sample media back pressure:

IOM sampler with GFA filter at 4 l/min =

approximately 10 inches of water

IOM sampler with 0.8µm MCE filter at 2 l/min =

approximately 15 inches of water

• Typical run time: 8 hours minimum at 3000 ml/min and 20 inches of water back pressure

224-PCMTX4 & 224-PCMTX8 only:

• Timer: Run time display 0 to 9999 minutes

Hold feature to pause pump and timer
Fault shutdown for low battery and high back pressure with timer freeze

224-PCMTX8 only:

• Timer: Delayed start up to 9999 minutes

Timed shut down

www.skcltd.com 224-UMTXM Issue F Page 3

Specifications

Pump Features

All Models

SKC offer two battery charger options for the Universal MTX series pumps, a single

Battery charging options

Mains power option

Anti-tamper cover

Low battery shutdown

Flow indicator

Particulate trap

Page 4 224-UMTXM Issue F www.skcltd.com

charger (Part No. 223-203A) and a five station charger (Part No. 223-103A). Both charger
models provide optimum charging of the NiMH battery packs used in the Universal MTX
series pumps, based on a timed (16 hour) constant current charging phase followed by
a switch to a trickle charging rate to prevent overcharging.

The Universal MTX series pumps can also be powered from the electrical mains supply
using a ‘battery eliminator’ (Part Nos. 223-305B - Euro 2 pin plug, 223-305C UK 3 pin
plug). This accessory comprises a mains adaptor and dummy battery pack which is fitted
to the pump in place of the standard battery pack. Please note that the pump’s ATEX
certification is invalidated when using the battery eliminator, and therefore must not be
used in hazardous areas when the battery eliminator is fitted.

The pump controls are situated beneath a clear anti-tamper cover, requiring a tool for
removal. This helps prevent tampering during a sample run.

Automatic pump shutdown in the event of a low battery condition. Prevents degradation
of battery pack due to over-discharge.

Built in rotameter to indicate airflow during sampling. Gives visual indication of changes in
flow rate during a sample due to filter loading or constricted tubing for example. Note the
flow indicator must not be used to calibrate the sample flow rate.

Built in replaceable filter to trap particles that would otherwise contaminate the pump
mechanism.

Specifications

Pump Features

224-PCMTX4 & 224-PCMTX8 Only

LCD screen indicates elapsed sample run time in minutes up to 9999 minutes

LCD screen

Sample hold function Enables pausing and restarting of the pump during a sample.

Flow fault function

224-PCMTX8 Only

Programmable run time

Programmable delayed start time

Intermittent sampling function Automatically calculates and controls on/off timing for multiple sample periods.

www.skcltd.com 224-UMTXM Issue F Page 5

(approximately one week). Also displays operating mode, battery condition and flow fault
condition. Elapsed sample time is retained on screen in the event of low battery or flow
fault shutdown.

Indicates flow fault due to obstructed tubing or excessive filter loading. Shuts the pump
down if the condition persists for longer than 15 seconds. Automatically attempts four
restarts before shutting down completely.

Sample run time programmable in minutes, via keypad and LCD screen. Pump
automatically shuts down at end of sample and elapsed run time is retained on LCD
screen.

Sample start delay time programmable in minutes, via keypad and LCD screen. Start
delay countdown display on LCD screen in operation.

General Information

1) Pump Models

224-44MTX Standard pump with simple on/off control.

224-PCMTX4 Intermediate pump with on/off control, sample hold and elapsed run time display.

224-PCMTX8 Deluxe pump with full timer control and timer display.

2) Care of Universal MTX Series Pumps

• Always use the correct SKC batteries and battery chargers designated for the Universal MTX series pumps.

• Never run the pump long term without a tube or filter medium in place.

• When carrying out sampling using long term colour change tubes always use a tandem tube holder with trap tube

(Part No. 222-3D-2 and cover 224-29T). This will prevent the aggressive fumes generated by these tubes from
entering and damaging the pump mechanism.

• When carrying out sampling using impingers always fit a trap between the impinger and pump inlet. This will
prevent the possibility of the fluid used in the impinger from entering and damaging the pump mechanism. As a
further precaution always ensure that the pump flow rate is set to below 1 litre/min before connecting the trap and
impinger to the pump inlet. For stability use the accessory mounting screws (refer to pump diagram on pages 8
and 9) to fix the impinger bracket to the front of the pump.

• The Universal MTX series pump cases are IP20 rated, they are not rated as water or splashproof and therefore
must not be used where it is possible for water to enter the pump casing.

• Universal MTX series pumps are fitted with a particulate filter which is easy to replace. For general maintenance
replace the filter every 2-3 months or if it appears dirty. New filters are white in colour (order Part No. P2240901).

Warning - Failure to follow these guidelines will void the product warranty.

Page 6 224-UMTXM Issue F www.skcltd.com

General Information

3) Non ATEX Certified Variants of the Universal Pump

The Universal pumps are also produced in a variant range which is UL certified for intrinsic safety and these pumps
are therefore not suitable for use in potentially explosive atmospheres in Europe where ATEX approval is mandatory.

Pump components vary between the UL and ATEX certified variants, therefore components must not be interchanged
between these pumps. If in any doubt please contact SKC Ltd customer services for advice.

4) Sampling Methods

This instruction manual provides the necessary information to set up and operate the Universal MTX series pumps. For
more detailed information on specific sampling methods please refer to SKC’s Step-By-Step Guide to Air Sampling
(Part No. 224-G1). To obtain a free copy please contact SKC Ltd customer services on [phone] or
download at www.skcltd.com.

5) The WEEE Directive

This product is marked with the crossed out wheelie bin symbol, which identifies that it falls within the
scope of the EC Directive 2002/96/EC on waste electrical and electronic equipment (WEEE). At the end of
it’s useful life, this product must be disposed of in an environmentally sound way as detailed in the Directive.
Note that the battery pack must be separated from the pump and disposed of as detailed in the Batteries
Directive (see below). Please contact your local distributor or SKC Ltd for further details on how to comply
with the requirements of the WEEE Directive. SKC Ltd’s producer registration number is WEE/KH0054TQ.

6) The Batteries Directive

The NiMH battery pack supplied with this pump and any spare battery packs purchased for it, fall within the scope of
the EC Directive 2006/66/EC on batteries and accumulators and waste batteries and accumulators. At the end of the
battery pack’s life it must be disposed of in an environmentally sound way as detailed in the Directive. Please contact
your local distributor or SKC Ltd for further details on how to comply with the requirements of the Batteries Directive.
SKC Ltd’s batteries producer registration number is BPRN00454.

www.skcltd.com 224-UMTXM Issue F Page 7

Diagram of the Universal MTX Pump

20 19

1

2

3

4

5

6

7
8

109

Page 8 224-UMTXM Issue F www.skcltd.com

11

18
17

16

15

14

13

12

22

23

24

21

20

25

Key to Pump Diagram

1. LCD screen

2. Flow and battery check key

3. START / HOLD key

4. SET-UP key

5. MODE key

6. SELECT key

7. SET key

8. Flow adjust control screw

9. Anti-tamper cover retaining screw

10. On/off switch

11. Accessory mounting screws

12. Flow indicator

13. Filter housing screws (4qty)

www.skcltd.com 224-UMTXM Issue F Page 9

14. Filter O ring seal

15. Inlet protection filter

16. Inlet protection filter housing

17. Air inlet

18. Exhaust port cover

19. Low flow mode screw cover

20. Battery pack

21. Low flow mode regulator cover

22. Belt clip

23. Main case screws (4qty)

24. Battery pack charging jack socket

25. Battery pack screws (2qty)

Pump Controls Layout

Standard Control

Panel : 224-44MTX

Intermediate Control

Panel : 224-PCMTX4

INTERMEDIATE

BATT SAMPLE RUNNING BATT SAMPLE RUNNING

SAMPLE PERIOD - MINUTES

START

HOLD

FLOW

ADJ

FLOW

AND

BATTERY

CHECK

ON

OFF

Deluxe Control

Panel : 224-PCMTX8

DELUXE

SAMPLE PERIOD - MINUTES

START

HOLD

SET-UP

DIGIT

SELECT

TOTAL

ELAPSED

TIME

FLOW

ADJ

FLOW

AND

BATTERY

CHECK

MODE

DIGIT

SET

PUMP

RUN
TIME

ON

OFF

Page 10 224-UMTXM Issue F www.skcltd.com

Getting Started

APPLICABLE TO ALL MODELS

1) Charging the Battery Pack

Prior to first use the battery pack should be fully charged, ideally overnight.

The Universal MTX series pumps must only be charged using the correct SKC chargers (Part Nos. 223-203A

- single charger, 223-103A - five station charger).

The charger is supplied with mains input plugs suitable for use in the UK, Europe, USA and Australia / New
Zealand. Select the correct mains input plug and fit it to the charger.

Plug the charger output jack plug into the mating socket at the rear of the battery pack. Plug the charger into
the electrical mains supply and switch on the power. The LED indicator on the charger will illuminate to indicate
that the charger is charging at full rate.

After 16 hours the charger will automatically switch to trickle charge, identified by the LED indicator on the
charger flashing on and off.

When fully charged disconnect the charger jack plug from the battery pack.

2) Accessing the Controls

To access the controls unfasten the screw retaining the anti-tamper control cover (No. 9) using the large bladed
screwdriver attachment of the supplied toolkit, and remove the cover to access the controls.

3) On/Off Switch (No. 10)

Set the on/off switch to the ON position and the pump will start to run. On Models 224-PCMTX4 & 224-PCMTX8,
the LCD screen will activate, and show the legends BATT, SAMPLE RUNNING and four zeros. If left running
the timer display will increment in one minute steps up to a maximum of 9999 minutes (approximately one
week), at which point the timer display will revert to 0000 minutes and continue to increment.

www.skcltd.com 224-UMTXM Issue F Page 11

Getting Started

4) Flow Adjust Screw (No. 8)

Use the small bladed screwdriver attachment of the supplied toolkit to turn the flow adjust screw. To increase
the flow rate turn clockwise. The span of the flow adjust screw is 12 turns. DO NOT FORCE the flow adjust
screw, and ensure the screwdriver end is securely located in the adjust screw slot.

Use a suitable flow calibrator (such as a rotameter or Defender primary calibrator) to set the required flow rate,
do not use the built in flow indicator.

APPLICABLE TO MODELS 224-PCMTX4 & 224-PCMTX8 ONLY

5) START/HOLD Key (No. 3)

Once the pump has been switched on using the on/off switch, press the START/HOLD key to put the pump
into hold mode. The pump will stop running and the timer display will freeze. The legend HOLD is indicated
in the bottom left of the LCD screen. Press the START/HOLD key again to restart the pump and the timer will
continue to increase from the point at which it was frozen. The words SAMPLE RUNNING will appear in the top
right of the LCD screen. Subsequent pressing of this key will toggle between sample running and hold modes.

6) FLOW AND BATTERY CHECK Key (No. 2)

With the pump in hold mode, press the FLOW AND BATTERY CHECK key. The pump will start to run but the
timer will remain frozen at its current reading. The legend HOLD in the bottom left of the LCD screen will flash
on and off to indicate that the pump is in the flow and battery check mode. Flow checks can now be carried
out without the time taken being included on the timer display.

If the pump battery is fully charged the legend BATT OK is displayed. If the battery is flat the legend LO BATT
is displayed.

Press the FLOW AND BATTERY CHECK again to return the pump to hold mode.

Page 12 224-UMTXM Issue F www.skcltd.com

Getting Started

APPLICABLE TO MODEL 224-PCMTX8 ONLY

7) SET-UP Key (No. 4)

With the pump in hold mode, press the SET-UP key to enter setup mode. The LCD screen will show the legend
SET UP DELAYED START and the right hand digit will flash.

In the setup mode the delayed start time, sample time and run time can be entered.

8) MODE Key (No. 5)

With the pump in the setup mode press the MODE key to sequence through the DELAYED START, SAMPLE
PERIOD and PUMP PERIOD settings, indicated by the corresponding legends on the LCD screen. The function
of these three settings is explained in the section ‘Operating the Timer’ on pages 14 to 17.

The required values for these three settings can be entered using the DIGIT SELECT and DIGIT SET keys.

9) DIGIT SELECT key (No. 6)

With the pump in the setup mode and the required time setting selected, press the DIGIT SET key to cycle
through the four timer digits on the display. The currently selected digit is indicated by flashing on and off. When
the required digit is selected it can be set to the required value using the DIGIT SET key.

10) DIGIT SET key (No. 7)

With the pump in the setup mode, the required time setting selected and the required digit selected, press the
DIGIT SET key to increment the value of the digit from 0 to 9 and back to 0.

www.skcltd.com 224-UMTXM Issue F Page 13

Operating the Timer (224-PCMTX8 Only)

The timer function features three settings used to achieve the various modes of operation:

1. DELAYED START - The time period in minutes that will elapse prior to the pump starting to run. Setting
this value to zero disables the delayed start function.

2. SAMPLE PERIOD - The time period over which sampling will occur. Works in conjunction with the PUMP
PERIOD. Setting this value to zero will disable the timed run function and the pump will run continuously
until stopped using the START/HOLD key.

3. PUMP PERIOD - The time period in minutes during which the pump is actually running. If the PUMP
PERIOD is set the same or to a higher value than the SAMPLE PERIOD, the pump will run continuously
for the duration of the SAMPLE PERIOD. If the PUMP PERIOD is set to a lower value than the SAMPLE
PERIOD then the pump will automatically calculate on and off periods to apportion the required PUMP

PERIOD time over whole of the SAMPLE PERIOD time.

Setting a Simple Timed Run

Example: 8 hour timed run with no delayed start.

1. Switch the pump on and press the START/HOLD key to enter hold mode.

2. Press the SET-UP key to enter setup mode.

3. Press the MODE key to cycle to the SAMPLE PERIOD setting option. The right hand digit will be flashing.

4. The timer is set in minute values. Calculate the required sample period in minutes - 8 hours = 480 minutes.
Thefore the right hand digit should be set to 0.

5. Press the DIGIT SELECT key to select the second digit from the right.

6. Press the DIGIT SET key to increment the digit to 8.

Page 14 224-UMTXM Issue F www.skcltd.com

Operating the Timer (224-PCMTX8 Only)

7. Press the DIGIT SELECT key to select the third digit from the right.

8. Press the DIGIT SET key to increment the digit to 4. The digits should now read 0480.

9. Note that if a SAMPLE PERIOD time is entered, but the PUMP PERIOD is left at 0000, the pump will run
continuously for the duration of the SAMPLE PERIOD.

10. The pump is now set up to run for 8 hours and switch off. To start the timed run press the START/HOLD
key. The pump will start and the legend SAMPLE PERIOD will flash on and off in the top right of the LCD
screen. At the end of the 8 hours (480 minutes) the pump will automatically stop and the display will show
the legends HOLD and SAMPLE OVER, and the elapsed run time. Should the pump prematurely stop
during the sample period the actual elapsed run time will be displayed.

Setting a Timed Run with Delayed Start

Example: 8 hour timed run with a 2 hour delayed start

1. Switch the pump on and press the START/HOLD key to enter hold mode.

2. Press the SET-UP key to enter setup mode.

3. The right hand digit of the START DELAY time will be flashing, the required start delay time in minutes can
now be entered. 2 hours = 120 minutes. Therefore leave the right hand digit set at 0.

4. Press the DIGIT SELECT key to select the second digit from the right.

5. Press the DIGIT SET key to increment the digit to 2.

6. Press the DIGIT SELECT key to select the third digit from the right.

7. Press the DIGIT SET key to increment the digit to 1.

8. The START DELAY time is now set to 120 minutes.

www.skcltd.com 224-UMTXM Issue F Page 15

Operating the Timer (224-PCMTX8 Only)

9. Press the MODE key to cycle to the SAMPLE PERIOD setting option. The right hand digit will be flashing.

10. The timer is set in minute values. Calculate the required sample period in minutes - 8 hours = 480 minutes.
Thefore the right hand digit should set to 0.

11. Press the DIGIT SELECT key to select the second digit from the right.

12. Press the DIGIT SET key to increment the digit to 8.

13. Press the DIGIT SELECT key to select the third digit from the right.

14. Press the DIGIT SET key to increment the digit to 4. The digits should now read 0480.

15. Note that if a SAMPLE PERIOD time is entered, but the PUMP PERIOD is left at 0000, the pump will run
continuously for the duration of the SAMPLE PERIOD.

16. The pump is now set to start after a delay of 2 hours, run for 8 hours and then switch off. To start the
timed run press the START/HOLD key. The LCD screen will show the legend DELAYED START flashing in
the bottom left of the screen and the start delay time will count down from 120 minutes. At the end of the
start delay the pump will automatically start and the legend SAMPLE PERIOD will flash on and off in the
top right of the LCD screen. At the end of the 8 hours (480 minutes) the pump will automatically stop and
the display will show the legends HOLD and SAMPLE OVER, and the elapsed run time. Should the pump
prematurely stop during the sample period the actual elapsed run time will be displayed.

Setting an Intermittent Sample

Intermittent sampling allows a sample to be taken over a period of up to 9999 minutes (approximately one
week) and can prove extremely useful for environmental or ambient monitoring. To sample over a period of one
week and produce an average measurement, the pump is set to actually draw air for a period that the battery
can handle such as 8 hours over the 7 day period.

Page 16 224-UMTXM Issue F www.skcltd.com

Operating the Timer (224-PCMTX8 Only)

Example: 8 hours running over a period of 24 hours

1. Switch on the pump and enter SET-UP mode. A DELAYED START time can be entered if required.

2. Press the MODE key to cycle to the SAMPLE PERIOD setting and enter 1440 minutes (24 hours) using the
DIGIT SELECT and DIGIT SET keys.

3. Press the MODE key to cycle to the PUMP PERIOD setting and enter 480 minutes (8 hours) using the
DIGIT SELECT and DIGIT SET keys.

4. The pump is now set for intermittent sampling, for a total of 8 hours over a period of 24 hours. To start
the intermittent sample run press the START/HOLD key. The pump automatically calculates the required
on/off timing strategy to apportion the PUMP PERIOD time over the SAMPLE PERIOD time. The pump will
start and the legend SAMPLE RUNNING will be indicated in the top right of the LCD screen and the legend
PUMP PERIOD will flash in the bottom right of the screen. The timer display will increment showing the
total elapsed time. To view the actual elapsed pump running time press and hold the DIGIT SET / PUMP
RUN TIME key. The display will return to the total elapsed time when the key is released.

5. At the end of the intermittent sample run the display will show the legends HOLD and SAMPLE OVER, and
the total elapsed time. Press and hold the DIGIT SET / PUMP RUN TIME key to view the elapsed pump
run time.

Setting a Repeat Run

To repeat a timed run at another time DO NOT switch the pump off using the on/off switch. Leave the pump
switched on with the LCD screen active. To re-run the program press the SET-UP key and then the START/
HOLD key. The pump will now repeat the timed run from the start.

To quickly clear a timed run from the pump’s memory switch the pump off and on using the ON/OFF switch.

Note: The battery pack can be safely charged when the pump is left switched on.

www.skcltd.com 224-UMTXM Issue F Page 17

Low Flow Sampling

The standard compensated flow range of the Universal MTX series pumps
is 1000 to 4000 ml/min. To operate at flows in the range 5 to 500 ml/min
an optional low flow adapter / tube holder is required. Low flow adapters
are available for simultaneous sampling using one, two, three or four
sample tubes (refer to the sampling accessories guide on pages 26 and
27 for details). The low flow adapters incorporate throttle valve(s) to set
the low flow rate.

To work with the low flow adapter the pump incorporates a ‘constant
pressure controller’ regulator to provide a constant suction at the outlet
of the low flow adaptor, ensuring stable airflow through the sample tube(s)
once the flow has been set using the throttle valve(s).

To enable or disable low flow mode a low flow mode control is located
beneath the smaller of the two knurled metal cap screws on the top of
the pump.

Unscrew and remove the cap screw, and use the large bladed screwdriver
attachment of the supplied toolkit to unscrew the low flow mode control
anti-clockwise by three turns to enable low flow mode.

To disable low flow mode screw the low flow mode control in fully clockwise.

To Set Up For Low Flow Sampling -

First ensure that low flow mode is disabled as detailed above. Ensure
that the low flow adapter is not connected to the pump inlet hosetail at
this point.

Page 18 224-UMTXM Issue F www.skcltd.com

Low Flow Sampling

Stand the pump upright on a level surface and set the
pump running. Set the pump flow rate to approximately

1.5 l/min. The built in flow indicator rotameter can be used

to make this setting as only an approximate flow rate is
required.

Turn off the pump and enable low flow mode as previously
detailed.

No further adjustment of the pump flow rate is required.

The low flow adapter can now be connected to the pump
inlet hosetail. Set the low flow rate with the throttle valve on
the low flow adjuster, using a suitable flow calibrator (such
as a Defender primary calibrator).

Note: Always check that low flow mode has been disabled
before carrying out high flow sampling subsequent to low
flow sampling using the same pump.

www.skcltd.com 224-UMTXM Issue F Page 19

Low flow
adapter

Troubleshooting

Possible Fault Corrective Action

• Check the battery charger by trying it with a different battery pack.

Battery pack will not charge

Pump will not operate

Pump flow faults continuously

(224-PCMTX4 & 224-PCMTX8
models only)

Pump cannot acheive required
flow rate

Page 20 224-UMTXM Issue F www.skcltd.com

Replace the battery charger if required.

• Check the battery pack by connecting it to a known good battery
charger. If the battery pack still will not charge replace the battery pack.

• Check for faulty battery pack by trying a known good battery pack.
Replace the battery pack if required.

• Filter media back pressure too high. Try a lower flow rate and/or a less
restrictive filter media if the sampling method being used allows this.

• More than one filter accidentally fitted into sampling head. Ensure that
only one filter is fitted into the sampling head.

• Filter backing paper fitted in addition to / in place of filter media. Ensure
that only the filter is fitted into the sampling head.

• Pump particulate filter is blocked (appears black). Replace the
particulate filter.

• Tubing blocked or crimped. Replace tubing.

• Battery pack voltage low. Fully charge the battery pack.

• Filter media back pressure too high. Try a lower flow rate and/or a less

restrictive filter media if the sampling method being used allows this.

• Pump is in the low flow mode. Disable low flow mode.

• Pump valves leaking. Replace valve plate assemblies.

Troubleshooting

Possible Fault Corrective Action

• Battery pack not fully charged before starting sample run. Ensure

Pump stops due to low battery
before the end of the required
sample period

www.skcltd.com 224-UMTXM Issue F Page 21

battery pack is fully charged before starting a sample run.

• Battery pack has reduced capacity as it nears end of life. Replace the
battery pack.

• Filter media back pressure too high. Try a lower flow rate and/or a less
restrictive filter media if the sampling method being used allows this.

Care of the Battery Pack

Battery Charging

• Charge battery pack fully before first use to ensure optimum performance.

• Full battery capacity will be acheived after 2 to 3 full charge / discharge cycles.

• Use only SKC approved charger designated for this battery pack. Use of a non-SKC approved charger

may impair battery performance or even cause irrepairable damage, and will invalidate the battery pack
warranty.

Battery Performance

• Charging temperature - For optimum performance charge NiMH batteries between 0 and +40°C.

• Do not overcharge - For optimum performance disconnect battery pack from charger after 24 hours.

• Discharge temperature - For optimum performance discharge NiMH batteries between -10 and +45°C

(refer also to pump specifications on page 3 for other limitations on operating temperature for intrinsically
safe applications).

Battery Maintenance

• Battery cycling during regular use - To maintain optimum capacity during regular battery use, cycle battery
once a month. Run pump until low battery shutdown occurs, then fully charge battery.

• Long term storage and highly infrequent use -

1. Charge battery fully prior to long term storage.

2. Store in a cool, dry place at temperature between 0 and 30°C.

3. Recharge battery at least once a year (or more frequently if stored at temperature above 30°C).

4. Cycle battery 2 to 3 times after long term storage to restore optimum capacity.

Page 22 224-UMTXM Issue F www.skcltd.com

Care of the Battery Pack

Battery Testing

1. Connect SKC approved charger to battery pack. If charger indicator LED illuminates, battery pack charger
input is ok. If charger LED does not illuminate, battery pack input fuse is blown - Replace battery pack.

2. Leave battery pack connected to charger to fully charge.

3. If pump does not function at all after full charge of battery pack, battery pack output fuse has blown, or
battery cells have failed or are at end of life - Replace battery pack.

4. If pump functions after full charge of battery pack but gives significantly reduced run times before low
battery shutdown, battery cells are failing or are at end of life - Replace battery pack.

Battery Replacement

Refer to pump diagram on page 8. To remove the battery pack unscrew and remove the two battery screws
(No. 25). Carefully slide the battery pack sideways out from under the metal belt clip (No.22) and remove the
battery pack.

Fit the replacement battery by sliding it under the metal belt clip. Take care to ensure that the pins of the pump
power connector engage into the holes in the socket connector on the battery pack. Secure the battery pack
with the two screws.

Battery Disposal

• The EC Battery Directive and equivalent legislation in other countries requires that all batteries and battery
packs are disposed of correctly at the end of their working life. This means that they must be collected and
treated separately from other waste.

• Please ensure that any end-of-life SKC battery packs are collected and recycled or disposed of correctly.

www.skcltd.com 224-UMTXM Issue F Page 23

Universal MTX Pump Components

1

2

4

9

11

13

Page 24 224-UMTXM Issue F www.skcltd.com

12

10

5 6

3

7

8

6

Universal MTX Pump Replacement Parts

Item Part No. Description Item Part No. Description

1

P22433C

2

P22433RGY

3

P22433ES

4

P22419MTX

5

P22433L

6

P22417F

7

P22417H

SKC recommend that our air sampling pumps are regularly serviced by one of our Authorised Service Centres.

Due to the safety implications associated with the incorrect repair of ATEX certified intrinsically safe products
for use in potentially explosive atmospheres, it is our policy to only supply the complete range of replacement
parts to our Authorised Service Centres who are trained in the service and repair of these products.

The range of replacement parts listed above is available to all customers. If the required part is not listed,
contact SKC customer care on [phone].

Note: Table item numbers correspond to the ringed numbers shown in the figures on page 24 of this manual.

www.skcltd.com 224-UMTXM Issue F Page 25

Keypad cover plate 8

Cap screws (set of 2) 9

External screw pack 9

Battery pack 4.8V 2.0Ah NiMH 10

Flow meter assembly 11

Valve plate assembly (set of 2) 12

Yoke / diaphragm assembly 13

P22417G

P22409

P2240901

P22417D

P22417K

P22417J

P22417C

Pump body

Inlet filter & O ring kit
(3 filters & 3 O rings)

Inlet filter (pack of 10)

Filter housing assembly
(includes 1 inlet filter & 1 O ring)

Pulsation dampener (set of 2)

Regulator assembly

Pressure (exhaust) port fitting

Universal MTX Pump Accessories

Part No. Description

Key Accessories

223-203A Single battery charger 100-240V ~ 50/60Hz supply with UK/EU/US/AUS mains plugs

223-103A Five station battery charger 100-240V ~ 50/60Hz supply with UK/EU/US/AUS mains plugs

223-305B Battery eliminator 230V ~ 50Hz supply with EU 2 pin mains plug

223-305C Battery eliminator 230V ~ 50Hz supply with UK 3 pin mains plug

393-0334 Rotameter 0.3 - 3.4 litre/min accuracy class 2.5 VDI/VDE 3513/2

717-510LA Defender primary calibrator 5 - 500 ml/min accuracy ±1% of reading

717-510MA Defender primary calibrator 50 - 5000 ml/min accuracy ±1% of reading

Dust Sampling Accessories

225-70A I.O.M. sampler in plastic complete with two part plastic filter cassette and clip

225-76A I.O.M. sampler in stainless steel complete with two part stainless steel filter cassette and clip

225-79A I.O.M. sampler in plastic complete with two part stainless steel filter cassette and clip

225-71A I.O.M. two part plastic filter cassette with cap and clip

225-75A I.O.M. two part stainless steel filter cassette with cap and clip

391-01 ‘Calidaptor’ flow calibration adapter for I.O.M. sampler

225-772 I.O.M. foam plug for respirable and multi-dust sampling (pack of 10)

225-69 Cyclone sampler in plastic with plastic cassette for 25mm diameter filters

225-69-37 Cyclone sampler in plastic with plastic cassette for 37mm diameter filters

225-62 Cyclone plastic cassette for 25mm diameter filters with clip

Page 26 224-UMTXM Issue F www.skcltd.com

Universal MTX Pump Accessories

Part No. Description

225-62-37 Cyclone plastic cassette for 37mm diameter filters with clip

225-67 Filter transport cassette for 25mm diameter filters

225-58F Glass fibre binder free (GFA) filter 25mm diameter 1.6µm pore size (pack of 100)

225-19 Mixed cellulose ester (MCE) filter 25mm diameter 0.8µm pore size with support pad (pack of 100)

225-8-01 PVC GLA-5000 filter 37mm diameter 5.0µm pore size with support pad (pack of 50)

Gas / Vapour Sampling Accessories

224-26-01 Single adjustable low flow adapter / tube holder

224-26-02 Double adjustable low flow adapter / tube holder

224-26-03 Treble adjustable low flow adapter / tube holder

224-26-04 Quadruple adjustable low flow adapter / tube holder

224-29A Protective cover type A 6mm diameter x 70mm

224-29B Protective cover type B 8mm diameter x 110mm

800-01200 Tube tip breaker

226-01 Anasorb CSC coconut charcoal tube 2 part 6mm diameter x 70mm GS (pack of 50)

226-119 Silica gel tube 2 part 6mm diameter x 110mm GS (pack of 100)

If the required item is not listed, contact your supplier or SKC sales on [phone].

SKC provide an extensive range of sampling media, including filters, sorbent tubes and impingers. A full
selection can be found in the current SKC catalogue and at www.skcltd.com

www.skcltd.com 224-UMTXM Issue F Page 27

Intrinsic Safety Certification

Page 28 224-UMTXM Issue F www.skcltd.com

Intrinsic Safety Certification

SKC customer service on request, for which

A full size copy of the certificate can be obtained from

www.skcltd.com 224-UMTXM Issue F Page 29

a nominal charge may be levied.

Intrinsic Safety Certification

Page 30 224-UMTXM Issue F www.skcltd.com

Intrinsic Safety Certification

SKC customer service on request, for which

A full size copy of the certificate can be obtained from

www.skcltd.com 224-UMTXM Issue F Page 31

a nominal charge may be levied.

Intrinsic Safety Certification

Page 32 224-UMTXM Issue F www.skcltd.com

Intrinsic Safety Certification

SKC customer service on request, for which

A full size copy of the certificate can be obtained from

www.skcltd.com 224-UMTXM Issue F Page 33

a nominal charge may be levied.

Warranty Information

Limited One Year Warranty

1. SKC warrants that this instrument, and each of its component parts, provided for occupational health and

safety applications is free from defects in workmanship and materials under normal use for a period of one (1)
year. This warranty DOES NOT cover any claims due to abuse, misuse, neglect, alteration, or accident, or use
in application for which the instrument was either not designed or not approved by SKC, or, due to the buyer’s
failure to maintain normal maintenance, improper selection or misapplication. The warranty also DOES NOT
cover any claims due to the use of a non-SKC approved charger to charge the battery pack. This warranty
shall further be void if changes or adjustments to the instrument are made by a person other than an employee
of the seller or, if the operating instructions furnished at the time of installation are not complied with.

2. SKC hereby expressly disclaims all warranties either expressed or implied, including any implied warranties

of merchantability or fitness for a particular purpose and neither assumes nor authorises any person to assume
for it any liability in connection with the sale of these instruments. No description of the goods being sold has
been made a part of the basis of the bargain or has created or amounted to an express warranty that the
goods will conform to any such description. Buyer shall not be entitled to recover from SKC any consequential
damages; damages to property, damages for loss of use, loss of time, loss of profits or income or any other
incidental damages. Nor shall the Buyer be entitled to recover from SKC any consequential damages resulting
from defect of the instrument.

3. This warranty extends only to the original purchaser of the warranted instrument during the term of

the warranty, the buyer may be required to present proof of purchase in the form of a paid receipt for the
instrument.

4. In the event of a defect, malfunction, or other failure of the instrument not caused by any misuse or damage

to the instrument while in the possession of the Buyer, SKC will remedy the failure or defect without charge

Page 34 224-UMTXM Issue F www.skcltd.com

Warranty Information

to the buyer. The remedy will consist of service or replacement of the instrument, or refund of the purchase
price, at the option of SKC. However, SKC will not elect refund unless it is unable to provide replacement and
repair is not commercially practicable.

5. The terms of this warranty begin on the date the instrument is delivered to the Buyer and continue for a

period of one (1) year.

6(a) To obtain performance of any obligation under this warranty, the buyer shall return the instrument, freight
prepaid to SKC at the following address:-

SKC Limited
11 Sunrise Park
Higher Shaftesbury Road
Blandford Forum
Dorset DT11 8ST
t: 44 (0) 1258 480188
f: 44 (0) 1258 480184

6(b) To obtain further information on the warranty performance contact SKC.

7. This warranty is provided under English law.

8. No other warranty is given by SKC in conjunction with this sale.

The disclaimers and limitations shall not affect the statutory rights of a consumer.

www.skcltd.com 224-UMTXM Issue F Page 35

Notes

Page 36 224-UMTXM Issue F www.skcltd.com

Notes

www.skcltd.com 224-UMTXM Issue F Page 37

A member of the SKC global group of companies

SKC Limited 11 Sunrise Park, Higher Shaftesbury Road, Blandford Forum, Dorset DT11 8ST United Kingdom

224-UMTXM Issue F November 2013

T: [phone] F: [phone] E: [e-mail] W: www.skcltd.com