Prothermo NMT 538
40
Hauser Systems & Gauging
6
Operation with the Tank Side Monitor NRF590
The wiring between the Prothermo NMT538 to NRF590, refer to the section 3.4 HART line cabling
prior to the actual operation through NRF590.
6.1 Initial NMT538 configuration before connect to NRF590
Caution!
Nature of the Prothermo NMT538 indicates various acceptability of foreign RTD average probe
connection for converting the E+H standard HART communication device.
Following terms must be clarified and preliminary configured by auxiliary HART communication
device; for example, generic HART communicator, service tool like ToF (Time of Flight) tool, or the
Proservo NMS.
-Number of element: NMT538 is normally delivered with 16 element numbers (maximum
connection). If fewer element numbers will be connected without proper set up, the average
temperature data will be unavailable due to the presence of element with no response. (Display
of error message 358.5°C)
-Lowest element position: The default lowest element position of NMT538 is 500mm (19.7").
-Element interval: Based on the configuration of connected average temperature probe, each
element position must be determined by interval between elements. Default setting is 2000mm
(78.7") equally spaced interval.
6.2 Additional adjustment factors
The Prothermo NMT538 has its own programming matrix that only E+H Sakura factory device can
access to. Following terms should be consulted with E+H personnel at ordering of the NMT538.
-Liquid offset level: In order to calculate liquid average temperature, only elements submerged
below 300mm (11.8") from the measured liquid level are involved in calculation. This offset value
can be entered only at the factory set up.
-Gas offset level: Just like liquid offset level, the gas phase average temperature calculation
includes the element that locates at least 300mm above measured liquid surface. The default
setting (300mm) can be only altered at the factory facility.
Note!
All of above initial configuration can be executed from ToF (Time of Flight) service tool with
NMT538 Device Description implemented.
6.3 NMT 538 operation from NRF 590 Tank Side Monitor
The NRF 590 Tank Side Monitor already has pre installed device menu for the NMT 538 as well as
FMR series radar level gauge. As soon as necessary hardware installation (includes device
setting & wiring) is completed, the NMT 538 is activated by the NRF 590’s power supply on the IS
HART loop. The device configuration from the NRF 590 to the NMT 538 is limited to the following
items.
•
Preamble Cmd (07c46)
•
Tag (07c48)
•
Temperature units (07c56)
•
Level units (07c75)
•
Address (07w42)
Note!
As long as necessary initial configurations are completed, NMT 538 shall be able to start
measuring temperature inside the tank as well as calculating both liquid & gas average
temperature based on liquid level acquired from the FMR series radar level gauge.
Please refer to the NRF 590 Tank Side Monitor operation manual for the data displaying
functionality.
6 Operation with the Tank Side Monitor NRF 590
