SKC Limited Pocket Pump MTX - Manual (Page 20)

Page 18 210-PMTXM Issue F www.skcltd.com
Operating the Pocket Pump in Constant Pressure Mode
Constant Pressure mode provides built in constant pressure control for multiple tube sampling applications.
It is recommended to start with a pump back pressure setting of 10 inches of water. Once the pump back
pressure is set, the tube flow rates are set using the needle valves built into the multiple tube holder. If it is not
possible to set the flow through a given tube high enough, then increase the pump back pressure setting, until
the required flow rate can be acheived.
Note that the combined flow rate through all of the tubes should not exceed 200 ml/min, and the pump back
pressure setting should not exceed 20 inches of water. Before starting sampling check that the pump can run
for the required sample duration at the combined flow rate and back pressure.
Constant Pressure mode is indicated by a ‘ ’ on the pump LCD screen.
1) Viewing the Run-Time Data
Press to scroll through the available run-time data screens:
Elapsed run time since last reset in minutes up to 999 minutes (approximately 16
hours). Above 999 minutes display reverts to 0 minutes and continues to count.
Pump back pressure in inches of water or millimetres of mercury.
Sample air temperature in °C or °F. Enhanced Display mode only.