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770-300M Issue E
Page 15
Setup of the Split2 Monitor for Sampling
Set up the sensor head assembly as detailed on pages 13 & 14 dependent on whether Passive or
Active (Pumped) sampling is to be performed and which particle size is to be sampled.
Ensure that the correct time and date have been set as detailed in on page 10.
Ensure that the Split2 monitor and sensor head assembly are allowed sufficient time to stabilise
to the ambient temperature of the sampling location. A minimum of 20 minutes is recommended
to achieve this.
Then perform the following steps:
1) Set the Flow Rate When Performing Active (Pumped) Sampling
The Split2 monitor does not need to be switched on when setting the flow rate.
The required flow rate is 2 l/min.
The required equipment is a flow meter with traceable calibration such as the SKC chek-mate,
a calibration adapter for the IOM sampler (SKC part number 391-01) and a length of 1/4” bore
flexible tubing.
Connect the outlet hosetail of the flow meter to the hosetail on the calibration adapter with the
length of flexible tubing.
Switch on the air sample pump and allow to run for at least 5 minutes to stabilise before proceeding.
Press the foam pad of the calibration adapter firmly against the IOM front plate on the sensor head
assembly. Maintain the pressure to keep the calibration adapter in place and ensure a consistent
seal throughout the calibration process.
Observe the reading of the flow meter and adjust the pump flow rate as detailed in the pump
instruction manual until the required flow rate of 2 l/min is achieved. Switch off the air sample
pump.
If performing a concurrent filter sample for gravimetric analysis note the flow rate reading for
use in calculating the dust concentration. The filter in place during calibration should be replaced
after the calibration with a clean filter and the filter and IOM cassette pre-weighed.