315c prv won’t calibrate

[Mbar]

ive got a 315c. Serial number cjc 03823. I put a prv valve on it and when trying to set the low pressure to 220 psi like sis says even if you scroll all the way up to 30 the best you can get is around 180. If you skip that and go to the high pressure. It will set fine. This thing has me a little stumped.

 

[Cmark]

What's the document number you are reading? The information I can see (RENR3814-19) says the calibration points are 72 and 362psi.

 

[Mbar]

I’ll have to go back and look. That would make much more sense