Calibration · Free Template

DP Transmitter Calibration Report Template

A 5 point calibration report for differential pressure transmitters in flow, level and filter service, with a zero check at line pressure and square root output support.

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Tag numberFT 3105

ServiceFeed water flow

Make and modelVendor DP transmitter

Serial numberDP 220781

Calibrated range LRV (mbar)0

Calibrated range URV (mbar)250

Output functionLinear (square root in DCS)

Static pressure in service (bar g)16

Tolerance (± % of span)0.25

Manifold3 valve

Zero at atmosphere (mA)4.002

Zero at line pressure, equaliser open (mA)4.018

Static pressure zero shift (% span)0.10

Pressure standardLow range pressure module 0 to 1 bar

Standard certificate noCC 24502

Calibration date25 Oct 2026

Calibration results (5 point, upscale and downscale)

Test point (% of span)	Applied DP (mbar)	Expected output (mA)	As found output (mA)	As found error (% span)	As found result	As left output (mA)	As left error (% span)	As left result
0	0.00	4.000	4.018	0.11	PASS	4.002	0.01	PASS
25	62.50	8.000	8.046	0.29	FAIL	8.003	0.02	PASS
50	125.00	12.000	12.061	0.38	FAIL	12.001	0.01	PASS
75	187.50	16.000	16.082	0.51	FAIL	16.002	0.01	PASS
100	250.00	20.000	20.090	0.56	FAIL	20.001	0.01	PASS
75	187.50	16.000	16.077	0.48	FAIL	16.003	0.02	PASS
50	125.00	12.000	12.056	0.35	FAIL	12.002	0.01	PASS
25	62.50	8.000	8.040	0.25	PASS	8.002	0.01	PASS
0	0.00	4.000	4.016	0.10	PASS	4.001	0.01	PASS

Maximum as found error (% span):0.56 · Maximum as left error (% span):0.02 · Overall result (as left if adjusted, else as found):PASS

About the DP Transmitter Calibration Report

DP transmitters measure small pressure differences at high line pressure. Besides the usual 5 point test, a zero check at line pressure reveals the static pressure effect, which can be a large error at low ranges.

How to fill in this template

Enter tag, range in mbar and tolerance.
With the transmitter in service, close HP and LP valves, open the equaliser and record the zero at line pressure; then vent and record the zero at atmosphere.
Isolate, connect the pressure standard to the HP side and vent the LP side.
Apply each test point upscale and downscale and record the as found output.
Trim zero and span if any point fails, record as left values, and return the manifold to service in the correct sequence.

What the formulas do

Applied DP = LRV + span × test point %.
Expected output = 4 + 16 × test point % mA.
Error (% span) = (measured − expected) ÷ 16 × 100.
Static pressure zero shift = (zero at line pressure − zero at atmosphere) ÷ 16 × 100.

Frequently Asked Questions

Why check zero at line pressure?

Line pressure deforms the sensor and shifts the zero. Trimming zero at line pressure removes this offset.

Should I calibrate in square root mode?

Calibrating in linear mode is simpler; if square root is used, compare against the square root expected current.

Which side gets the pressure?

The HP side, with the LP side open to atmosphere.

Learn more on the blog

DP level transmitter calibration: zero suppression and zero elevation

A practical guide on instrumentationblog.in that explains the procedure behind this template and how engineers apply it on real plants.

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