Barton Make Circular Chart Recorder. Can you help me out with the calibration procedures ?
Circular Chart Recorder
Two types of Circular Chart recorders are available for pressure recording.
One type is applying direct process pressure. For Example 0-100 psi range.
Another type works on output from 3-15 PSI signal from Pressure Transmitter.
Calibrate recorder at 3 psi as zero and 15 psi at full scale.
Step 1: Apply known range pressure by a dead weight tester or 3-15 psi by precision regulator.
Step 2: Apply full range pressure to recorder. Adjust linkage to recorder so that pointer is max reading on the chart scale.
Step 3: Reduce pressure to zero and check the pointer reads zero on the chart.Adjust pointer if necessary.
Step 4: Repeat the steps 2 and 3 until both readings are correct.
Step 5 : Recorder linearity adjustment by keeping the signal 50 % of max reading on the chart. Adjust 50%.
Step 6 : Check the reading for 0%, 50% and full scale. you may need to adjust many times till the recorder readings are correct.
Step 7 : Record all readings on Calibration sheet.