Sensor Inspection; Transmitter Testing; Output Checkout; Spare Parts - ABB LMT100 Operation Instructions Manual

68

Sensor inspection

The sensor of the LMT Series consists of a metal tube
containing several wires The sensor tube will measure the float
location properly if the tube is straight and the float can travel
freely up and down its length Perform a visual inspection on
the sensor tube to make sure it is straight, free from pits or
gouges, and does not show excessive wear patterns

Transmitter testing

The transmitter of the LMT Series is designed to return a level
indication and an output based on the position of a float on its
sensor tube If the transmitter is equipped with an HMI, the
level and output will be displayed on the front of the electronics
module
1 Apply power to the transmitter using the typical power setup
for the particular option
2 Move the float up and down the sensor tube
3 Monitor the indication of the level on the HMI to make sure
the indication corresponds to the float position
4 Remove the float to make sure the transmitter responds with
an Alarm Indication (based on the dip switch position) and a
level indication of ----
5 Place the float back on the sensor tube with the correct
orientation
IMPORTANT NOTE
It is possible for the LMT Series to continue providing a 4-20 mA
output if the HMI display is not functioning properly If the HMI
indicator on an electronics module fails to operate, it is
recommended that the electronics module be replaced at the
earliest convenience It will not be necessary however to shut
down a transmitter or remove it from service based on an HMI
failure

Output Checkout

The LMT Series is equipped to provide level indication through
the 4-20 mA output with HART communications Only
transmitters that are specified to output 4-20 mA may be used
in a Safety Implemented System The HART communication
capability of the 4-20 mA transmitter will only be used for
configuration and proof testing
4-20 mA Output
The current output of the LMT Series transmitter update at
least every 110 milliseconds and be filtered through the user
adjusted Damping The maximum response time to a process
change will be less than 110 milliseconds or the value of the
Damping, whichever is greater
1 Apply power to the transmitter using the typical loop wiring
2 Connect a multi-meter (set to read milliamps) to the transmitter
using the "Meter" connections on the terminal strip
3 Move the float along the length of the probe and monitor the
milliamp output on multi-meter
L M T S E R I E S | M A G N E TO S T R I C T I V E L E V E L T R A N S M I T T E R | O I/ L M T 1 0 0/ 2 0 0 - E N R E V. B
4 The output should indicate the float position based on the
calibration range of the transmitter
HART Output
1 Apply power to the transmitter using the typical loop wiring
2 Connect a HART handheld device across a 250 ohm resistor
in series with the loop
3 Move the float along the length of the probe and monitor the
PV indication on the handheld device
4 The output should indicate the float position based on the
calibration range of the transmitter
Loop Check
• Without HART
With the transmitter installed, wired and powered in its field
location, move the float up and down the length of the probe
Confirm the proper reading at the indication or control side of
the loop Move the float using the process fluid or some other
mechanical means If moving the float is not possible, the loop
may be checked using an independent device such as a loop
calibrator
• With HART communications
With the transmitter installed, wired and powered in its field
location and power supplied to the loop, connect a HART
handheld device to the loop across a 250 ohm resistor Using
the Loop Test feature of the HART handheld, drive the output of
the transmitter to 4 mA and 20 mA Confirm the proper reading
at the indication or control side of the loop Minor adjustments
to the output of the transmitter may be made using the DAC
Trim (Digital/Analog Convertor) feature

Spare parts

Please refer to Figure 3 in this manual for the item in the below
spare part list table
Item no .
1
2
3
4
6
7
8
9
12
Description
Window cover - aluminum
Window cover - stainless steel
HMI display assembly
HMI connector
Communication board
Terminal board without surge
Terminal board with surge
Blind cover - aluminum
Blind cover - stainless steel
Agency approved plug (½" NPT)
Agency approved plug (M20)
Plastic plug (½" NPT)
Plastic plug (M20)
Standard mounting kit
Vibration isolator mounting kit
Part Number
3KQZ207029U0100
3KQZ207030U0100
3KQZ204001U0000
3KXL000273U0100
3KQZ207044U0300
3KQZ207063U0100
3KQZ207064U0100
3KQZ207035U0100
3KQZ207110U0100
3KXL000613U2600
3KXL000614U1100
3KXL000438U0100
3KXL000289U0100
SPM200-1018-3
VI-KIT