How to calibrate Frac Van to well head transducers.

1. How to Calibrate a Frac Pump and
Data Van Pressure Transducer
David Aakre
Technologist

2. Pressure Transducer 0 to 15,000. Uses
Calibration Pin A and D.

3. Transducer Calibration Switch on
Pump Control Panel.

4. From Remote Box Go to Pump Control.

5. Next Choose Hardware Setup

6. Choose Pump

7. Pump Sensors

8. Discharge Pressure

9. Calibration Screen

10. Calibration Steps for Pressure
Transducer On Pump
SCREEN
MIN-SCALE READING 0 PSI
SET
CALIBRATE MIN-SCALE 819
AVG COUNTS 21
FULL SCALE READING 15,000
CALIBRATE FULL SCALE 4095
ZERO CALIBRATION:
1. With very little pressure on pump, Press Calibrate Min-Scale Twice. The Scale counts should
be around 819.
2. Press SET twice to save calibration.
FULL-SCALE CALIBRATION:
1. Hold calibration switch up at pump truck. Pressure on remote box should be 15,000 PSI.
2. Press Calibrate Full-Scale Twice. The Scale counts should be around 4095.
3. Release calibration switch at pump truck.
4. Press SET twice to save calibration.

11. NOV Rolligon Pump Use Zero and Span
to Calibrate Pressure Transducer

12. Data Van Well Head Pressure
Transducer can be Calibrated this Way.

13. Data Van Well Head Pressure
Transducers
• The Data Van usually has calibration switches
for well head pressure transducers .
• Low counts are set in software which is zero
pressure and is at 4 milliamps. 4ma= 0 psi
• High counts are set by holding switch up and
hitting span or High counts button. 20 ma=15k
• Accufrac and Essex Software is set up using
this method. Two point Calibration

14. Some Pressure Transducers Have Cal Pressure In
Which You Use Instead of 15,000 psi for 20 ma Scale.

15. Some Software Uses Pressure
Transducer Slope for Calibration
• Slope =Max Pressure on Transducer / (4ma-
20ma)
• Slope = 15000psi/ 16 ma = 937.50
• Slope= 100 psi transducer/ 16 ma= 6.25
• Slope = 20k psi transducer/ 16 ma= 1250
• I believe you got the point take max psi
reading on transducer and divide by 16.

16. Software Using Slope for Pressure Transducer / No calibration
loop on transducer. B and C pins are current loop.

17. DAVID AAKRE
TECHNOLOGIST
Make Shure you Calibrate all your pressure Transducers before you start
the job. Safety is your first Priority.