SKC Limited AirChek 3000 Deluxe Pump Operating Instructions - Manual (Page 40)

Page 38 210-3311M Issue E www.skcltd.com
The standard compensated flow range of the AirChek 3000 pump is 1000 to 3250 ml/min. To operate at flows
in the range 5 to 500 ml/min an optional low flow adapter / tube holder and a constant pressure controller
(CPC) are 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 49 - 51 for details). The low flow adapters incorporate throttle
valve(s) to set the low flow rate.
The CPC is a device that when connected to the pump inlet hosetail provides a constant suction at the outlet
of the low flow adapter, ensuring stable airflow through the sample tube(s) once the air flow rate has been set
using the throttle valve(s).
To Set Up For Low Flow Sampling -
Before connecting the sample train to the pump set the pump flow rate to 1500 ml/min - refer to User Interface
Level One 1) on page 22. There is no need to accurately calibrate the pump flow rate as only approximate flow
rate setting is required for correct operation of the CPC. Switch the pump to HOLD mode.
Connect the CPC to the pump air inlet port hosetail - the short length of tubing supplied connected to the CPC
is connected to the pump hosetail. Ensure that the CPC is connected correctly, the side of the CPC with the
label should be pointing away from the pump.
The low flow adapter can now be connected to the CPC inlet hosetail with a length of tubing, and the sorbent
tube fitted into the short length of tubing attached to the low flow adapter. Set the required low flow rate by
adjusting the throttle valve on the low flow adjuster, using a suitable calibrated flow meter (such as a Defender
primary calibrator).
Note: If carrying out high flow sampling subsequent to low flow sampling with the same pump, ensure that
the CPC is disconnected.
Low Flow Sampling