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DP Level Transmitter Calibration Report Template

A 5 point calibration report for DP level transmitters, including elevated and suppressed zero ranges. It shows the equivalent level for each applied DP so technicians can relate the test to the tank.

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Tag numberLT 2101

ServiceCondensate drum level

LRV (mbar), negative for elevated zero−294.2

URV (mbar)0

Process specific gravity1

Low sideWet leg, water, 3 m

Tolerance (± % of span)0.25

Calibration date25 Oct 2026

Calibration results

Test point (% of span)	Applied DP (mbar)	Equivalent level (m)	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	−294.20	0.000	4.000	4.010	0.06	PASS	4.001	0.01	PASS
25	−220.65	0.750	8.000	8.021	0.13	PASS	8.002	0.01	PASS
50	−147.10	1.500	12.000	12.030	0.19	PASS	12.001	0.01	PASS
75	−73.55	2.250	16.000	16.041	0.26	FAIL	16.001	0.01	PASS
100	0.00	3.000	20.000	20.050	0.31	FAIL	20.002	0.01	PASS
75	−73.55	2.250	16.000	16.038	0.24	PASS	16.002	0.01	PASS
50	−147.10	1.500	12.000	12.027	0.17	PASS	12.001	0.01	PASS
25	−220.65	0.750	8.000	8.019	0.12	PASS	8.001	0.01	PASS
0	−294.20	0.000	4.000	4.008	0.05	PASS	4.000	0.00	PASS

Maximum as found error (% span):0.31 · Maximum as left error (% span):0.01 · Overall result (as left if adjusted, else as found):PASS

About the DP Level Transmitter Calibration Report

DP level transmitters often have elevated or suppressed zero ranges because of wet legs, seals and mounting height. Testing in DP while showing the equivalent level makes the calibration easier to check against the real tank.

How to fill in this template

Enter LRV and URV in mbar as calculated for the tank, including wet leg or seal head.
Enter process SG to see the equivalent level for each test point.
Apply DP at the HP side (or apply vacuum to the LP side for negative values) and record outputs upscale and downscale.
Adjust if needed and record as left readings.
Restore wet legs and seals before returning to service.

What the formulas do

Applied DP = LRV + span × test point %.
Equivalent level (m) = (applied DP − LRV) × 100 ÷ (SG × 9806.65).
Error (% span) = (measured − expected mA) ÷ 16 × 100.

Frequently Asked Questions

Why is my LRV negative?

A wet leg or seal capillary on the LP side adds head, so an empty tank gives negative DP.

Can I calibrate a level transmitter by filling the tank?

A wet calibration is possible but slow; bench or in situ DP calibration is normal, followed by a level check.

What is 1 m of water in mbar?

About 98.07 mbar.

Learn more on the blog

Level transmitter 5 point calibration: as found and as left procedure

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

Read Full Article

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