I have a problem with cd23 (connected to DP15 transducer Diaph 3-34) when I try to calibrate it with a water-based manometer something weird happens. When I lift the tank (in comparison to the reference tank) let’s say for 1 cm, the modulator reads 1.00 (which is correct) but then it keeps increasing going to 2.5 or even higher without me even lifting the water reservoir! I’ll appreciate if you let me know what’s the problem.
The whole systems is calibrated by Validyne on April 2016.
When there is no pressure, the CD23 reads zero and stays there. I have also checked its performance and it passed the test. Yes, when I lift the tank for 1cm the modulator reads 1.00 but in each minute there is 1mm of increase in pressure ( i.e. modulator reads 1.1)