Installation, Operation, & Maintenance Instructions
IOM J500.35
2021.04
JMT
● +1.440.572.1500
23
4.2.13 Factory Configuration
Password Protected
– Factory Use Only
4.2.14 Diagnostics
Diagnostics will show information regarding the transmitters
operating temperature, loop voltage, and time since last reset or
power on.
This information may be useful in helping diagnose/troubleshoot
your JMT Series Magnetostrictive.
Enter
exits back to menu.
4.2.15 Exit Menu
Exits back to
Operating Screen.
5. Troubleshooting
5.1 Theory of Operation
The Jerguson JMT Magnetostrictive’s electronics send a low-power pulse down the sensing wire. Where the
Magnicator float’s magnetic field intersects the magneto-elastic sensing wire. A torsional return “pulse”
results, and travels back towards the electronics, where it is measured. The “time of flight” is used to
determine the position of the float compared to the electronics.
5.2 Transmitter Adjustment and Sources of Malfunction
Transmitter Adjustment
Adjusting 4-20mA values
If it is desired to move the level measurement that will give a 4 mA or 20 mA value, i.e. 20mA to
correspond to lower measurement than full span, simply use the
Rerange
function.
Adjusting 0” for Process Connection
If it is necessary to move the actual level at which the instrument will report 0”, for example to
report the level based on a process connection, a
One-Point Calibration
is necessary. This type
of arrangement is shown below. In effect it is a negative level offset.
