Casella CEL AFC123 User Manual

Casella USA
17 Old Nashua Road #15
Amherst, NH 03031
Email [e-mail]
Web www.casellausa.com
TF [phone]

USER MANUAL

AFC123

PERSONAL AIR SAMPLER

COPYRIGHT

The copyright in this document which contains proprietary
information is vested in CASELLA LIMITED. The contents of
this document must not be used for purposes other than for which
it has been supplied or reproduced or disclosed wholly or in part
without the prior written permission of CASELLA LIMITED.

CASELLA LIMITED

Regent House
Wolseley Road
Kempston
Bedford
MK42 7JY
Telephone :[phone]
Facsimile :[phone]
Telex :827707
Email :[e-mail]
Web :www.casellacel.com

AFC123 Personal Sampler. Page 1
Handbook No. HB3182-02 Issue2/JULY 1994

Casella USA
17 Old Nashua Road #15
Amherst, NH 03031
Email [e-mail]
Web www.casellausa.com
TF [phone]

Contents.

1. Introduction.................................................... 3

2. Principle Of Operation.................................…4

3. Operation.................................................…..5

4. Maintenance and Servicing.....................……6

5. Calibration.................................................... 12

6. Fault Finding................................................. 17

7. Spare parts…………………………………..18

8. Specification.................................................. 24

9. Optional Accessories..................................... 25

10. Warnings.................................................…..26

AFC123 Personal Sampler. Page 2
Handbook No. HB3182-02 Issue2/JULY 1994

Casella USA
17 Old Nashua Road #15
Amherst, NH 03031
Email [e-mail]
Web www.casellausa.com
TF [phone]

AFC123 HIGH FLOW PERSONAL SAMPLER.

1. Introduction.

The purpose of the instrument is to collect contaminate from air in the
breathing zone of a person during a normal work period. The choice for
sampling head and type of analysis give comparisons with occupational
Exposure Limited or MAC values allowed by regulation.

AFC123 Personal Sampler. Page 3
Handbook No. HB3182-02 Issue2/JULY 1994

Casella USA
17 Old Nashua Road #15
Amherst, NH 03031
Email [e-mail]
Web www.casellausa.com
TF [phone]

2. Principle Of Operation.

Air containing contaminate is drawn through the sampling head

at the

optimum rate found by experience. Suction is provided by a pump driven by
a d.c. motor from a rechargeable nickel cadmium battery for up to 10 hours.
Flow rate is variable by the user to suit the sampling technique.

The tough lightweight plastic case houses a diaphragm pump with motor,
the electronic control board, the ON/OFF switch recessed into the case back,
the battery pack and pulsation damper. The inlet to the damper contains a
primary filter of sintered bronze to protect the pump if run without a
sampling filter. The socket on the case side takes a plug for recharging the
battery in-situ. The battery pack is easily changed for continuous shift
working. One light emitting diode is seen through the case front, green to
indicate pump running. Also fitted is a battery low cut-off, which will turn
the pump off if it is inadvertently left running. This prevents the cells being
damaged by deep discharge and also gives maximum life to the battery.

Size of sampler 120*75*44, mass of 440 grammes causes no significant
handicap to wearer during work.

Note:- This leaflet describes how the sampler works and how to maintain it.
It does not detail how to sample or analyse collected samples, or how to
select methods for various hazards. Consult Occupational Health and
Hygiene Division of Health and Safety Executive Research Association of
the industry concerned, or an Advisory and Analytical Service.

Information on available sampling heads and accessories is given in a
separate leaflet
HB3175/87.

AFC123 Personal Sampler. Page 4
Handbook No. HB3182-02 Issue2/JULY 1994

Casella USA
17 Old Nashua Road #15
Amherst, NH 03031
Email [e-mail]
Web www.casellausa.com
TF [phone]

3. Operation.

The battery must be fully charged to ensure an 8 hour run, especially for
filters giving a high initial pressure drop. The sampler is designed to work at
a maximum efficiency within the flow rate of 1 to 2 litres/min. and to
maintain the set flow rate within ±5% for pressure drop of up to 40cm H2O.
At lower flow rates of the specified range down tom0.5 litres/min. the power
limit will be reached at a drop of approximately 35cm H2O at this level the
control limit will operate to switch the pump off. At flow rates approaching

2.5 litres/min. the control limit will not operate and will only maintain
±5% of present flow rate up to 25cm H2O.

Note:- The sampler should never be run without a filter on the

inlet.

A suitable filter is put into the appropriate holder and is connected by a
length of plastic tube to the inlet of the sampler. Switch the pump ON, slide
the switch located in the recess at the back of the case. The green light
indicates the pump is running. Setting of the flow rate is by adjustment of
the potentiometer marked FLOW on the side of the case. Turn clockwise to
increase the flow rate. To carry out the adjustment set the sampler up as
described with the flowmeter attached upstream of the sampling head using
flowmeter stand (01-100890B) with the appropriate flowmeter. The set up is
described in separate leaflet hb3175/87 'Sampling Heads and Accessories
for High Flow Personal Samplers'.

Check List Before Sampling.

Make sure the battery has been fully charged. Ensure sampling head is
correctly fitted with no leaks. If flow rate cannot be obtained with similar
conditions to previous occasions suspect leakage.

AFC123 Personal Sampler. Page 5
Handbook No. HB3182-02 Issue2/JULY 1994

Casella USA
17 Old Nashua Road #15
Amherst, NH 03031
Email [e-mail]
Web www.casellausa.com
TF [phone]

4. Maintenance and Servicing.

7.1. Service Department.

Casella's in house service department offers a comprehensive range of repair

and calibration services, designed to effect a fast and efficient back-up for

all our products. The Service Department is operated under the scope of our

BSI registration for products manufactured by us. We will however,

undertake the repair of other manufacturers equipment.

For further information please contact our Service Department at our

Bedford premises. We will be happy to provide quotations for individual

repairs or provide annual maintenance under contract.

Battery.

If the flow rate normally found throughout accustomed head cannot be
maintained for a given time then check that:

1. If filter disc is used, is resistance too high? High dust levels, high relative
humidity, too small a pore size, may plug the filter after a few hours.
Replace with clean filter. If now satisfactory change disc more often.

2. Battery maybe at the end of its service life. To check:- charge the battery
for 14 hours, disconnect the battery from the charger and discharge through
a 27 ohm resistor
rated at 2 watts or more to 4.4 volts (approximately 51/2 hours). Repeat
charge/
discharge twice. If 177mA cannot be produced for 51/2 hours, discard the
battery as it is beyond useful life.

AFC123 Personal Sampler. Page 6
Handbook No. HB3182-02 Issue2/JULY 1994

Casella USA
17 Old Nashua Road #15
Amherst, NH 03031
Email [e-mail]
Web www.casellausa.com
TF [phone]

Pump Unit. (Fig. 1).

Note:- Servicing and reassembly of the pump unit should be carried out in a
clean and dust free environment. Dust particles under the valves or in the
bearing will lower the pump performance and lead to higher operating
voltages and current.

1. Undo four screws , remove case lid (Fig. 2). Disconnect and remove
battery.

2. Remove two screws marked a (Fig. 2). Remove tube connector from
damper outlet and lift out pump unit. Unsolder motor connections from the
control board.

Valves.

The valves are made from synthetic rubber.

1. Remove valve chest (09-102158C) with diaphragm clamp plate (09­102157C) by removing four securing screws Z002/16 (Fig. 1).

2. Remove two screws Z002/13 which hold the valve chest to the diaphragm
clamp plate and separate the two parts. Valve assemblies are retained in the
valve chest by the
O ring seals (O/106/1).

3. Note the orientation of the valve assemblies so that they can be correctly
reassembled.

4. Remove the O ring (O/002/1) from the ends of the valve retainers (09­102160A)
from the ends of the valve retainers (09-102160A). Push the valve retainers
through the valve seat (09-102159A) to remove valve (01-101189A).

AFC123 Personal Sampler. Page 7
Handbook No. HB3182-02 Issue2/JULY 1994

Casella USA
17 Old Nashua Road #15
Amherst, NH 03031
Email [e-mail]
Web www.casellausa.com
TF [phone]

5. Clean valve seat and make sure that the valve face is smooth and
unmarked. Check that new valves have no rough or frayed edges which may
result in leakage. Rinse the valves in methylated spirits to remove any trace
of mould release agent and very lightly dust with fine talc before assembly.

6. Refit the valve and retainer to the valve seat and fit the O ring (O/002/1)
over the retainer until it engages under the shoulder of the stem. The
retaining force on the

valve can now be adjusted by gentle pressure in the appropriate direction
and should be such that the shoulder under the head of the retainer sits
gently on the upper surface of the valve, so that the valve can just rotate.
Excessive initial force on the valve will cause high current consumption.

7. Reassemble in to valve chest ensuring correct orientation of valves.
Suction valve assembly adjacent to the uppermost. Discharge valve
assembly has the valve facing downwards. Ensure O rings (O/016/1) are
fitted.

8. Reassemble diaphragm clamp plate to valve chest and refit the assembly
to the motor mounting with screws (Z002/13).

Performance Checks (Before Replacing).

Leak Check.

1. Valve chest securing screws not tightened.

2. Pump diaphragm may have failed.

3. Valves may not be correctly tensioned.

AFC123 Personal Sampler. Page 8
Handbook No. HB3182-02 Issue2/JULY 1994