halstrup-walcher P82R Instruction Manual

Contents

P82R Instruction Manual9Please note:The LCD will not display the correct value when repositioning the S1 switch(from root-extracted to linear).4 Calibrating the zero pointPlease remember that it takes roughly 30 to 60 minutes for the pressuretransducer to warm up after it is switched on. The output signal may notremain stable during this period.Set the S1 switch to “linear” before calibrating the zero point.Turn the P5 trimmer (SMU =creep suppression) to the left stop position.After the pressure transducer has warmed up, the operator may use the P1 or P4trimmer to calibrate the zero point when current output is available (see figure 1),taking care that the transducer is not connected to a source of pressure. This mayrequire having to disconnect the tubing from the pressure ports.After calibrating the zero point, slide the S1 switch back to “root-extracted ”.5 Setting creep suppressionU/I0...10% 100% pThe creep-suppression function suppresses the pressure transducer output, i.e.,keeps it at “0”, despite any existing pressure. The P5 trimmer can be used to setcreep suppression to a value between 0 and 10% of the measurement range. Use ofthe creep-suppression function is advisable for many applications, as the instrumentwill otherwise fail to generate reproducible results of a measurement when the flowrate / volume flow is very low.Use of the creep-suppression function limits the low end of the transducermeasurement range by 0 … 10%, depending on the settings. The outputsignal will be kept at “0” despite any pressure present.