Panametrics Sentinel LCT, User Manual

Page: 208 / 248

Chapter 8. Maintenance
196 Sentinel LNG User’s Manual
8.1.3 Trimming 4-20 mA Using the Keypad
1. In the
User Program
, scroll to CAL with
4-20 Loop
highlighted. Press [ENT].
2. Scroll to
Mode
and press [ENT]. In the
Mode
window, scroll to
Test[Trim]
and press [ENT].
3. Return to the
Loop
window, and scroll to
Percent .
4. In the
Percent
window, use the arrow keys to set the percentage to
100%
. Press [ENT]. Record the value shown on
the current meter.
5. Now use the arrow keys to set the percentage to
0%
. Press [ENT]. Record the value shown on the current meter.
6. Return to the
Loop
window, and scroll to
Base Trim.
Press [ENT].
7. Use the arrow keys to enter the base trim value, the value recorded in step
5
. (The loop current should now be the
same as the current meter. It should read
4.0 +/-0.01 mA
.) Press [ENT] .
8. Repeat steps
3
and
4
.
9. Return to the
Loop
window, and scroll to
Span Trim.
Press [ENT].
10. Use the arrow keys to enter the span trim value, the value recorded in step
4
. (The loop current should now be the
same as the current meter. It should read
20.0 +/-0.01 mA.
) Press [ENT].
11. Return to the
Loop
window, and scroll to
Mode.
Press [ENT]. Scroll to
Normal ,
and press [ENT].
Note: The difference between “
Test
” and “
Test [TRIM]
” is that “
Test
” is the raw output current without the trim applied.
“
Test [TRIM]
” is the output current with trim applied.
8.2 Spare Parts
The
Sentinel LNG
is a high-accuracy calibrated flowmeter. Local custody transfer requirements may disallow field
replacement of any parts in this flow metering system without a proper calibration of the entire system at an
approved calibration facility. Check with local authorities to determine if field replacement of parts is allowed.
If fault is found with the the flowmeter electronics, the entire measurement head can be replaced to ensure
hardware and firmware compatibility. The replacement part number will be as shown in Sentinel Electronics SEN898
on page 9 of this manual. To ensure that the correct part number is ordered, provide your local Panametrics Sensing
representative with the serial number of the meter, located as shown on the Name and Specification Plate on
page 3.
If it is determined that a flow transducer has been damaged or is faulty, it may also be replaced in the field. Please
consult the factory for the appropriate part number.
8.3 Installing Replacement Parts
The
Sentinel LNG
is a high-accuracy calibrated flowmeter. Local custody transfer requirements may disallow field
replacement of any parts of this flow metering system without a proper calibration of the entire system at an
approved calibration facility. Check with local authorities to determine if field replacement of parts is allowed.
If it is appropriate to replace any component of the flow metering system, the Panametrics Sensing field service
team is trained and equipped to perform the replacement on-site. Installation of these field replaceable parts by a
Panametrics Sensing field service team member will maintain the accuracy of the system and any applicable
warranty. Please consult the factory to order the appropriate components and to schedule installation in the field.