What is Calibration:

Procedure

ISOLATION STEPS

â‘  Close the high side valve from the manifold 

â‘¡ Open the equalizer valve from the manifold

â‘¢ Close the low side valve from the manifold

â‘£ Close the equalizer valve from the manifold

⑤ Be careful do not open all the three valve in the same time to avoid sensor damage in case of process high temperature or chemical.

 


CARIBRATION

â‘  Set up and connected the related instruments required for the test as shown in fig.

â‘¡ Transmitter without optional elevation/suppression kit

With no calibrating pressure on transmitter, adjust zero screw so that output is 4mA.

â‘¢ Transmitter with optional elevation/suppression kit

Apply calibrating pressure equal to the lower differential limit. Adjust elevation/suppression screw so that output is approx. 4MA. Still, adjust zero screws so that the output is exactly 4mA.         

â‘£ Apply calibration pressure equal to upper differential limit. Output should be 20mA.

⑤ If output is not correct, adjust span screw so that output is 20mA.

â‘¥ Repeat step 3 through 5 until both output are correct.

⑦ If this transmitter has the output indicator, confirm the indicated value which should be your LRV value at 4mA and URV at 20mA.

TAKIN IN SERVICE STEPS

â‘  Open the equalizer valve from manifold 

â‘¡ Open the Low side valve from manifold 

â‘¢ Open high side valve from manifold 

â‘£ Close the equalizer valve from manifold 

⑤ Be careful do not open all three valve at the same time to avoid sensor damage in case of process high temperature or chemical.