Emerson Rosemount 3152, Справочное руководство

Страница: 39 / 84

Reference Manual
00809-0100-4835 Rev BE
February 2018
Rosemount 3150 Series
Calibration 30
Figure 3-5 – Elevated Zero
Calibration Example
Figure 3-5a – Example for Elevated Zero
Calibration (English Units)
Range 2 with Zero Elevation for a calibration of
–120 to –20 inH
2
O (100 inH
2
O span)
1. Calibrate the transmitter to 0 to 100 inH
2
O as
described in the Zero Based Calibration Procedure .
2. Consult Figure 3-8b to help determine typical coarse
zero select jumper position. If necessary, reposition
jumper using the
Coarse Zero Select Jumper
Position Selection Procedure .
For this example:
% Zero Offset = (-120 inH
2
O /250 inH
2
O)*100 = -48%
Position the jumper to the MID ZE position.
3. Apply -120 inH
2
O to the high side process connection
(as marked on the transmitter sensor module) and
adjust the zero until the transmitter output reads 4mA.
DO NOT USE THE SPAN ADJUSTMENT.
NOTE
Applying 120 inH
2
O to the low side process connection (as
marked on the transmitter module) will give the same result.
4. Apply -20 inH
2
O to the high side process connection
(as marked on the transmitter sensor module). Verify
the output reads 20mA. If necessary, adjust the span.
Recheck the zero after any span adjustment.
NOTE
Applying 20 inH
2
O to the low side process connection (as
marked on the transmitter module) will give the same result.