Adjustment; Sensor Calibration - Endress+Hauser Proservo NMS5 Operating Instruction

12 Adjustment

100
12 Adjustment
12.1

Sensor calibration

After exchanging CPU module, detector unit, wire drum, measuring wire (all or part), it is necessary to
adjust the hall sensors and make new weight table calibration.
1. Move the displacer to the side of calibration window or the maintenance chamber window (top
of the tank) or put the displacer on a work bench so that the displacer can be touched.
Figure 89: Sensor calibration 1
2. Confirm that NMS5 is level and no vibration or other disturbance occurred.
3. Set access code to 530 at GVH039.
4. Set operation command to STOP at GVH020.
5. Select ADJ.SENSOR at GVH030.
6. Record sensor count (Wa2) at GVH741.
Figure 90: Sensor calibration 2
WARNING
Do not let wire fall off the wire drum.
7. Lift the displacer so that the weight of the measuring wire shows 0 until the sensor count is stable
and record the value of sensor count (Wa1). Use the following formula to get the difference
between Wa2 and Wa1.
• |Wa2 - Wa1 | = 10000 (+/-100)?
8. If Yes, go to step 7 "GVH740 A Zero".
530
GVH039
ACCESS CODE
STOP
GVH020
OPERATION
ADJ. SENSOR
GVH030
MATRIX OF
Index
count
(Ex. Wa2= 25000)
29XX
ADJ. A SPAN
(Ex. Wa1= 15000)
29XX
ADJ. A SPAN
Proservo NMS5
Sensor
count
25000
15000
Endress+Hauser