Principle of operation – Casella CEL AFC123 User Manual
Page 4
Casella USA
17 Old Nashua Road #15
Amherst, NH 03031
Email
Web
www.casellausa.com
TF (800) 366-2966
AFC123
Personal
Sampler.
Page
4
Handbook No. HB3182-02 Issue2/JULY 1994
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.