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[?]: how I can recalibrate Difmanometr DM 235-73 ?

Posted: Wed Jun 13, 2007 10:10 am
by Fahriddin
I have diff.manometr DM 235-73.
Could you help me how I can recalibrate output signal from 0-10mH to 4-20mA.

Re: [?]: how I can recalibrate Difmanometr DM 235-73 ?

Posted: Wed Jun 13, 2007 7:57 pm
by zenchek
FAHRIDDIN wrote:I have diff.manometr DM 235-73.
Could you help me how I can recalibrate output signal from 0-10mH to 4-20mA.
Hi Fariddin.
I supose 0-10mH is 0 - 10 meters of water column ?
For calibrate this differential manometer is necessary to have pneumatic pressure source calibrated in meters of water and one DMM with current scale of 0 - 30 mA Dc.
This manometer have two inputs for pressure, one named + or H ( high ) and other - or L (low ) , and two adjust potentiometers or buttons , one for zero and other for span.
Apply +24 Vdc to supply terminals, with miliampermeter placed in serial, then vent to atmosfere the two pressure inputs and adjust 4 mA with zero,
then apply one pressure equivalent to 10 meters of water column to High pressure input ( with low pressure input vented to atmosfere) and adjust 20 mA with span potentiometer.
Repeat this procedure for obtain exactly 4.00 mA an 20.00 mA.
This is all.
Regards
Zenchek

how I can recalibrate Difmanometr DM 235-73 ?

Posted: Sat Jun 16, 2007 4:35 am
by Fahriddin
Hi, Zenchek.
Thank you for answer. I have understand how to calibrate. Sorry, it was a little misunderstanding with my question. I have incorrectly expressed.
I will change output signal from mH to mA. Now too difficult convert mH signal to mA. I have only 4-20mA analog inputs cards in my controller.
Is it possible to change Physically in elecrtonic board or I need signal convertor?

Fahriddin