Page 28
770-300M Issue E
www.skcltd.com
Maintenance of the Split2 Monitor
1) Checking the Calibration Span
The calibration span accessory is a light scattering device that provides a constant value
(termed a “k” factor).
The calibration span accessory should be used as a reference to check the factory calibration
span of the Split2 monitor.
The calibration span should be checked under the following conditions:
• Once a month with normal usage.
• If the Split2 monitor or sensor head is dropped or otherwise damaged.
• The first time the unit is used to double check the factory calibration.
Note: SKC recommend annual servicing of the Split2 monitor.
Prior to checking the calibration span ensure the following:
1. The sensor optics must be clean (refer to Cleaning the Sensor Optics on page 30).
2. The environment must be clean, i.e. dust free.
3. The battery must be fully charged (refer to page 16).
4. The particle size setting must be set to Respirable (refer to page 16/17).
5. The custom scale factor must be reset to the default value of 01.00 (refer to Setting a
Custom Scale Factor on page 25/26).
Assemble the sensor head as shown below with the IOM inlet, rubber seal and IOM front plate
only fitted.
Perform an auto-zero (refer to page 19).
Insert the calibration span accessory into the sensor head inlet ensuring that it is pressed in
fully.
Run the Split2 monitor for at least two minutes in Run - Continue mode and then note the
dust concentration reading on the Split2 monitor.
Compare the indicated reading with the K Factor value printed on the calibration span
accessory. The reading should be within ±10% of the K Factor value. If the difference is greater
than ±10% repeat the calibration span check procedure.
If the difference between the Split2 monitor reading and the K factor value is still greater than
±10% then the Split2 monitor should be returned to SKC for service and recalibration.