Page 8 Milltronics ILE-61 – INSTRUCTION MANUAL 7ML19985CX01
Calibration
General
A test weight is a calibration reference used to simulate a material impact force (test
rate) on the flowmeter sensing plate during the integrator span calibration. The test
weight is also used to perform a test to verify that the flowmeter sensing head is level.
The test rate should be 60 to 80% of the system designrate.
To determine the test rate produced by a specific test weight...
Test Rate (TPH) = Test Weight (grams)
45* grams/ TPH
Alternatively, to determine the test weight required for a specific test rate:
Test Weight (grams) = 45* grams x Test Rate (in TPH)
1 TPH
*Use 60 grams for A-300 flowmeters.
e.g. If the test weight used with an E-300 flowmeter is 7000 grams...
Test Rate = 7000 grams
= 155 TPH
45 grams/TPH
LVDT Output
Zero Adjustment
1. Connect a voltmeter across the LVDT green and yellow (or yellow and white) wires.
2. With no load applied to the sensing plate, observe 0.10 V AC on the voltmeter.
a.Loosen the locknut on the LVDT threaded core.
b.Turn the core in/out of the LVDT until 0.10 to 0.05 V AC is obtained.
c.Tighten the locknut, ensuring the measured value is maintained.
Note: Use metric tons per hour (t/h) or short tons per hour (STPH) as applicable for
TPH.
Note: If the LVDT output is 0.10 to 0.05 V AC, skip to span test, otherwise, proceed
as follows:
LVDT core
moving beam
locknut
increase decrease
LVDT
to integrator
LVDT EXC. or
LVDT conditioner
card
± 0.05 V AC
>± 0.05 V AC
7ML19985CX01.book Page 8 Thursday, September 18, 2003 12:15 PM
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