Siemens SITRANS WFS300 Betriebsanleitung - Seite 25
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6.3
Span test
1. Gently push the sensing head moving beam to the right. The LVDT output should steadily
increase until a level of 0.75 to 1.0 V AC is achieved.
2. Gently push the sensing head moving beam to the left. The LVDT output should steadily
decrease until zero is reached and then start increasing again to 0.015 to 0.5 V AC.
3. Ensure the LVDT output always returns to 0.10 ± 0.05 V AC, (to the right hand side of zero)
when pressure on the moving beam is released.
Note
The LVDT core must not contact the inside of the LVDT over the range of core travel. The
actual LVDT core travel during this procedure is less than 3 mm (1/8").
6.4
Sensing head level test
1. With the voltmeter still connected to the LVDT output, hang the test weight directly off the
sensing plate.
2. Check to ensure that the LVDT output does not change by more than 0.01 V AC.
Note
If the change is greater than 0.01 V AC:
1. Adjust the sensing head level, [refer to Sensing head (Page 12) ] until the change with
2. Remove the test weight and readjust the LVDT Output Zero, if necessary. If the level test
SITRANS WFS300
Operating Instructions, 03/2021, A5E32880243-AC
and without the test weight on the sensing plate is less than 0.01 V AC.
is performed after the integrator has been calibrated, a new integrator zero and span
calibration, span adjust, and factoring, should be performed.
Commissioning
6.3 Span test
25