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PostPosted: Wed Jun 13, 2007 1:10 pm 

Joined: Wed Jun 13, 2007 1:05 pm
Posts: 2
Location: Uzbekistan
I have diff.manometr DM 235-73.
Could you help me how I can recalibrate output signal from 0-10mH to 4-20mA.


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PostPosted: Wed Jun 13, 2007 10:57 pm 

Joined: Mon Aug 14, 2006 4:23 pm
Posts: 82
Location: Sud America
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


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PostPosted: Sat Jun 16, 2007 7:35 am 

Joined: Wed Jun 13, 2007 1:05 pm
Posts: 2
Location: Uzbekistan
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


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