bench calibration of d/p transmitter

test equipments needed
. digital mutimiter fluke 87
.variable dc power supply
.pressure calibrator/hand pump fluke 718
.precision test gauge
.hard communicator model 375
resistor 250 ohms
ss fittings--- 1/4 " OD NPT male connector
.tee piece---1/4 " OD
set of ferrule and fittings
plastic tube high pressure

procedures:
1. prepare calibration data sheets/technical manuals of transmitter for calibration
2.set the differential pressure transmitter into the bench calibration stand
3.connect  1/4 " OD NPT fitting to high pressure side of d/p transmitter with plastic tube fitted to the end fo 1/4 " OD straight connector including tee piece fittings to the other end whre precision test gauges is connected.
4.connect plastic tube end fittings to the output of pressure calibrator fluke 718
5.connect power supply 24 VDC to the transmitter terminal block positive and negative terminals with a 250 ohms resistor connected in series between powersupply and trasnmitter negative or anyone.
6.connect the hart communicator model 375 pareallel negative positive lines
7/power on 24 VDC power supply and also the hart communicator
8 check cthe configration of the transmitter. if not yet configured, make ready with you the data to download and configure the transmitter
9 after downloading data, check zero of the transmitter with open vent on high side. if zero is ok, close vent and start increasing pressure equivalent to 1,25,50,75,100 of the assigned range with corresponding output readings.
10.decrease the actuating pressure to 100,75,50,25,0 of the assigned ranges.records the corresponding readings.
11. if not ok, repeat steps 9 to 10 and appropriate adustments shallbemade until satisfied accuracy is obtained.
12.ifspan is not ok, adjust span with corresponding max input and output readings, repteat steps 9 and 10 until satisfied
13.the percent erros calculated of the above checked shall not exceed satisfied accuracy of the assigned ranges.
14.fill up calibration reports forms.