Milltronics ILE-61, Инструкция по эксплуатации

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Page 10 ILE-61 Sensing Head – INSTRUCTION MANUAL 7ML19981CX01
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 Design Rate.
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 Vac 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 Vac 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 Vac, 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 Vac
>± 0.05 Vac
376draft1.fm Page 10 Wednesday, November 21, 2001 1:54 PM