Endress+Hauser Prothermo NMT 539 User manual

Products Solutions Services
BA01026G/08/EN/18.15
71282283
Operating Instructions and
Description of Instrument Function
Prothermo NMT539
Temperature

Prothermo NMT539
2Endress+Hauser
Basic Device Layout of Prothermo NMT539
Basic Device Layout of Prothermo NMT539
Figure 1: System Layout 1
1. Average Temperature Prothermo NMT539 Installation on Tank Top
• The actual installation may require an installer to work in a hazardous area. Safety must be taken into account in order to avoid any
harmful conditions.
• The installation method depends on the type of NMT539. Refer to BA01025G/08/EN "Installation Instructions."
2. Wiring to Host Instruments (Tank Side Monitor NRF590 or Proservo NMS5/NMS7)
• Wiring material and conditions must be in accordance with intrinsically safe standards.
• One end (normally on the host instrument side) of the shield twisted pair of cables must be grounded at the terminal connection.
• Refer to BA01025G/08/EN "Installation Instructions."
3. NMT539 Initial Setup
• Both NMT539’s own device setting and local HART setting to the host instrument must be performed.
4. Data Flow from NMT539 to Host Instruments
• Individual element temperature data: Individual raw element temperature can be accessed regardless of liquid level information on
the NMT539’s data matrix.
• Average temperature data: The host instrument sends liquid level data on the local HART line to NMT539. NMT539 calculates both
Gas and Liquid phase average temperature based on this given liquid level.
• WB (Water Bottom) data: WB data and information are continuously scanned and transmitted by host instruments as long as the local
HART connection is active.
Liquid Level
Power (AC/DC)
FMR 540
NRF590
NMT 539
Ex i Local HART Loop
(Data Transmission)
Liquid & Gas
Temperature
Water Interface
(WB)
FMR Power
(DC, Exi)
Fieldbus Protocol
Tankvision
sio
n

Prothermo NMT539
Endress+Hauser 3
Table of Contents
1 Notes on Safety Conventions and Symbols . . . 4
1.1 Symbols for Certain Types of Information . . . . . . . . . . . 4
2 Initial Set Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 Local HART Connection . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Device Setup: NRF590 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Device Setup: NMS5/NMS7 . . . . . . . . . . . . . . . . . . . . . . . 7
3 Operation and Description of Instrument
Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 Local HART Device Designation . . . . . . . . . . . . . . . . . . . 9
3.2 Device Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.3 Temperature Measurement . . . . . . . . . . . . . . . . . . . . . 10
3.4 Water Bottom Measurement . . . . . . . . . . . . . . . . . . . . 22
3.5 Temperature + Water Bottom Measurement . . . . . . 28
4 Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Table of Contents

Prothermo NMT539
4Endress+Hauser
1 Notes on Safety Conventions and Symbols
To highlight safety-relevant or alternative operating procedures in this manual, the following conven-
tions have been used, each indicated by a corresponding symbol on the left.
1.1 Symbols for Certain Types of Information
Symbol Meaning
A0011189-EN
DANGER!
This symbol alerts you to a dangerous situation. Failure to avoid this situation will result in
serious or fatal injury.
A0011190-EN
WARNING!
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in
serious or fatal injury.
A0011191-EN
CAUTION!
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in
minor or medium injury.
A0011192-EN
NOTICE!
This symbol contains information on procedures and other facts which do not result in
personal injury.
Symbol Meaning
A0011182
Allowed
Indicates procedures, processes or actions that are allowed.
A0011183
Recommendation
Indicates procedures, processes or actions that are recommended.
A0011184
Forbidden
Indicates procedures, processes or actions that are forbidden.
A0011193
Tip
Indicates additional information.
DANGER
WARNING
CAUTION
NOTICE
1 Notes on Safety Conventions and Symbols

Prothermo NMT539
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2 Initial Set Up
2.1 Local HART Connection
2.1.1 Endress+Hauser Tank Gauging Instrument
NMT539 is developed and designated primarily to work with Endress+Hauser tank gauging host
instruments Tank Side Monitor NRF590 or Proservo NMS5/NMS7.
Both temperature and / or water bottom information are transmitted on a two wire i.s local HART loop
to the host instrument. Since both NRF590 and NMS5/NMS7 have a pre-configured menu for NMT
series functionality as default, simple wiring to NMT539 will complete the initial setup for NMT539.
• Refer to the Installation manual BA01025G/08/EN for NMT539 physical installation procedure
prior to start up.
• The availability of each of the four parameters can vary depending on the selected NMT539 mea-
surement function on the product code.
Temperature Measurement Measurement Function
0: Converter only
1: Temperature + converter
These four basic data are available as standard.
1. Average liquid temperature
2. Average gas phase temperature
3. Level (entered liquid level at "VH02 measured distance")
4. Device status
Water Bottom (WB)
Measurement
Measurement Function
2: Water bottom + converter
These four basic data are available as standard.
1. Water bottom level
2. WB probe capacitance
3. WB probe frequency
4. Device status
Temperature + Water
Bottom + Converter
Measurement Function
3: Temperature + water bottom + converter
These four basic data are available as standard.
1. Average liquid temperature
2. Water bottom level
3. Average gas phase temperature
4. Device status
CAUTION
2 Initial Set Up

Prothermo NMT539
6Endress+Hauser
2.2 Device Setup: NRF590
Connect the loop powered local HART communication cable from the NRF590 (intrinsically safe side
compartment) to NMT539 according to BA01025G "Installation Instructions."
Since NRF590 has been designed to recognize NMT539 as a specific Endress+Hauser local HART
instrument, set up is easy.
2.2.1 HART Scanner
After the physical cabling between NMT539 and NRF590 is complete, scan all connected loop powered
local HART devices by activating "HART SCAN" on NRF590.
Not all NRF590 have fully accessible compatibility to recognize the NMT539. Consult with
Endress+Hauser representatives to cross check the software and hardware version of NRF590.
2.2.2 NMT539 Specific Parameter Setup on NRF590
• Configuration of NMT539 parameters on the display of NRF590 is dependent on the installed soft-
ware and hardware version of NRF590. Refer to the operating manual of NRF590 to determine
accessible parameters.
• All required initial setup and configuration can be performed by FieldCare. Detailed information will
be described in the following operation related chapters.
WARNING
NOTICE
2 Initial Set Up

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2.3 Device Setup: NMS5/NMS7
NMS5/7 is also specifically designed to recognize NMT539.
Terminals 24 and 25 of NMT539 and NMS5/NMS7 are connected by using local HART.
The connection between NMS5/NMS7 and NMT539 is specified by Ex approval.
Refer to the separate BA01025G "4.4 Terminal Connection" for wiring.
2.3.1 Preparation of NMS5/NMS7
MS5/NMS7 must be pre-configured to accept the NMT539 connection via the multi drop local HART
loop.
GVH362: NMT Connection
"Average Temp." must be selected in order to configure NMT539.
To change this parameter, an access code is required. Refer to BA00401G "NMS5 Operation Instruc-
tions" for further information.
2.3.2 NMT539 Configuration on NMS5/NMS7
Most required NMT539 parameters can be configured on G4 "Temperature" matrix as it is on the dis-
play of NMS5/NMS7.
WB (Water Bottom) sensor information is not available on NMS5/NMS7 before ROM version 4.24.
Consult with Endress+Hauser representatives to update the installed NMS5/NMS7 function.
Typical NMT539 parameters are displayed on the matrix of NMS5/NMS7
G0 Static Matrix GVH010: Liquid Temp
Display average liquid temperature.
GVH013: Gas Temperature
Display gas average temperature.
G4 Dynamic Matrix:
Temperature
GVH440: Liquid Temp
Display the same value indicated on GVH010 Liquid Temp.
GVH441: Gas Temperature
Display the same value indicated on GVH013 Gas Temperature.
GVH442: Measured Level
Display liquid level value established in NMS5/NMS7.
NMT539 must have liquid level data in order to calculate both liquid and gas phase average tempera-
ture.
GVH447: Reference Zero
Check that temperature transforming of measuring temperature resistor is performed correctly.
Allowable range: -1.0 to +1.0°C(+30.2 to +33.8°F)
GVH449: Reference 17
This temperature is used to check at the time of shipping.
GVH450 to 459: Temp No.1 to 10
Display the measuring value of temperature from each inserted element in the probe.
The value of element temperature above 11 to 16 must be selected at GVH470 "Select Point", then the
values are shown at GVH473 "Element Temp."
WARNING
WARNING
WARNING
2 Initial Set Up

Prothermo NMT539
8Endress+Hauser
GVH460 to 469: Element Position No.1 to 10
Display each element position in the probe.
Indicating element position above 11 to 16 must be selected at the GVH470 "Select Point", then the
positions are shown at GVH474 "Element Position"
GVH470: Select Point
Select matrix of GVH471 "Zero Adjust", GVH473 "Element Temp", and GVH474 "Element Position." and
input the desired element data.
GVH480: Diagnostic
Display of error code message. Refer to the error code chart in a later chapter of this manual.
GVH482: Total No. Element
Input the number of installed temperature elements in the average temperature probe.
GVH485: Type of Interval
Select type of element interval.
Even: Element spacing will be equally spaced by providing the distance at GVH487 "Element Interval",
and the lowest element position can be set at GVH486 "Bottom Point."
Not Even: Element spacing will be unequally distributed. As a result, each element position must be
manually entered.
This parameter setting is only used to change the theoretical element position within NMT539’s
software for average calculation purposes. The physical location of the temperature element position
does not change.
GVH486: Bottom Point
The lowest inserted element position in the average temperature probe.
This parameter setting is only used to change the theoretical element position within NMT539’s
software for average calculation purposes. The physical location of the temperature element position
does not change.
GVH487: Element Interval
Enter the desired element interval when "Even" in GVH485 " Type of Interval" is selected.
This parameter setting is only used to change the theoretical element position within NMT539’s
software for average calculation purposes. The physical location of the temperature element position
does not change.
NOTICE
NOTICE
NOTICE
2 Initial Set Up

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3 Operation and Description of Instrument
Function
This section is described for description for FieldCare.
NMT539 has segmented local HART device code depending on measurement function. Following 4
local HART device codes are normally pre-set at the factory by jumper setting.
Do not change jumper setting by disassembling NMT539’s internal module. It may cause major mal-
function due to distorted precise factory calibration.
3.1 Local HART Device Designation
Local HART device code "184":
This code is the device code for temperature measurement function only. This 184 is specifically
designed for NMT539 converter only version and converter + temperature version. No WB sensor is
available with code 184.
Local HART device code "185":
This code is the device code for equipped NMT539 water I/F measurement function. FieldCare does
not recognize code 185.
Local HART device code "186":
This code is the device code for fully equipped NMT539. NMT539 with converter + temperature +
water bottom uses code 186.
3.2 Device Data
Tag Number: read and write
Default: local HART
This number is for A customer specific device identification and control number (or name). Tank name,
site number, or any other ID can be entered.
Assembly Number: read and write
Default: 0
This number is for manufacture control number based on production process.
WARNING
3 Operation and Description of Instrument Function

Prothermo NMT539
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3.3 Temperature Measurement
These 2 local HART device codes 184 is designated to perform only temperature measurement func-
tion. Available parameter and function are follows. Description of these parameters are the informa-
tion based on FieldCare menu.
Local HART device code will be only displayed when default header position or VH99 "Device Type Code"
on FieldCare menu are available.
Designated temperature measurement function device is available on following product order code.
Measuring Function
0: Converter Only
1: Converter + temperature
4: Converter + temperature (W&M certification)
3.3.1 Primary Values: VH00 to VH09
VH00: Liquid Temp
Item type: read only
Range: -200°C to 240°C
• Display measured liquid phase average temperature.
• Liquid level input must be provided by Micropilot radar level gauge (via NRF590) or NMS5/NMS7
series servo level gauge in order to calculate true liquid average temperature.
VH01: Gas Temp
Item type: read only
Range: -200°C to 240°C
Display measured gas (vapor) phase average temperature.
Liquid level input must be provided by Micropilot radar level gauge (via NRF590) or NMS5/NMS7
servo level gauge in order to calculate true gas average temperature.
VH02: Measured Distance
Item type: read and write
Range: 0mm to 99999mm
Display provided liquid level by connected level gauge.
When level gauge is not connected, inputting liquid level is also available for the device test purpose.
VH07: Temperature 0
Item type: read only
Check that temperature transforming of measuring temperature resistor is performed correctly.
Allowable range: -1.0 to +1.0 °C(+30.2 to + 33.8°F)
VH09: Temperature 17
Item type: read only
This temperature is used to check at the time of shipping.
NOTICE
NOTICE
NOTICE
3 Operation and Description of Instrument Function

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3.3.2 Element Temperature 1: VH10 to VH19
VH10 to 19: Temperature 1 to 10
Item type: read only
Range: -200°C to 240°C
Display individual measured element temperature.
3.3.3 Element Temperature 2: VH20 to VH29
VH20 to 25: Temperature 11 to 16
Item type: read only
Range: -200°C to 240°C
Display individual element temperature.
VH26: Selec. Ave Method
Item type: select
Selection: Standard, Advanced
Selection average calculation method.
Standard: Conventional Calculation Method
Regardless of tank shape, average temperature calculation will be performed based on following exam-
ple. example: liquid temperature
Figure 1: Conventional Calculation Method (Standard)
Formula: (T1 + T2 + T3) / # of element in liquid phase
= Average temperature (3.5°C + 3.0°C + 2.0°C) / 3 = 2.83°C
Advanced: Average Temperature Calculation with Additional Factor to Compensate Unequal Volume Distribution
(Example: Liquid Temperature)
Figure 2: Conventional Calculation Method (Advanced) 1
Formula: (T1*V1 + T2*V2 + T3*V3) / (V1 + V2 + V3) = Average temperature
Element #1: 3.5°C (T1)
Element #5: 4.5°C (T5)
Element #4: 4.0°C (T4)
Element #3: 2.0°C (T3)
Element #2: 3.0°C (T2)
Element #1: 3.5°C (T1)
Element #5: 4.5°C (T5)
Element #4: 4.0°C (T4)
Element #3: 2.0°C (T3)
Element #2: 3.0°C (T2)
3 Operation and Description of Instrument Function

Prothermo NMT539
12 Endress+Hauser
V = # of additional volume factor and related parameters are determined at VH53, 54, and 55.
Figure 3: Conventional Calculation Method (Advanced) 2
(3.5°C x 2 + 3.0°C x 3 + 2.0°C x 4) / (2 + 3 + 4) = 2.67°C
VH27: Multi Spot Type: Display of Sequence
Item type: select
Selection: Spot, Multi
Select element physical layout in the probe.
NMT539 Converter Only version requires this function when it has connected to foreign average tem-
perature probe.
NMT539 Converter + Temperature version always has "Spot" element layout. Selecting parameter
"Multi" will cause faulty calculation.
Spot: When some elements are located in each input cable in the probe; average calculation is performed
based on sum of submerged element temperature value/total number of element submerged.
Figure 4: Spot Temperature
NOTICE
Element #1: 3.5°C (T1)
Element #5: 4.5°C (T5)
Element #4: 4.0°C (T4)
Element #3: 2.0°C (T3)
Element #2: 3.0°C (T2)
2.0°C
= V (volume factor)
3.5°C
3.0°C
2.0°C
2.0°C2.0°C
3.0°C 3.0°C
3.5°C
WARNING
Liquid Average Temperature = (T1 + T2 + T3) / 3 = 25.5°C
Pt100 Element #1:
25.0°C (T1)
Pt100 Element #3:
26.0°C (T3)
PT100 Element #2:
25.5°C (T2)
Pt100 Element #4:
24.0°C (T4)
Pt100 Element #5:
24.5°C (T5)
Probe End
To Converter
Liquid Level
Gas (Vapor) Phase
Liquid Phase
NMT 539
Input Signal Cable
3 Operation and Description of Instrument Function

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Multi: When different or number of elements are located in each input cable; average temperature is consid-
ered as the closest submerged element to the liquid level.
Figure 5: Multi Temperature
VH28: Lower Limit
Item type: read and write
Default value: -20.5°C
RANGE: -999.9°C to 999.9°C
Display low limit temperature alarm parameter when measurement detects below design and
approved temperature.
VH29: Upper Limit
Item type: read and write
Default value: 245°C
Range: -999.9°C to 999.9°C
Display high limit temperature of measurement element. This value is used for judgment of element
disconnection.
3.3.4 Element Position 1: VH30 to VH39
VH30 to VH39: Position 1 to 10
Item type: read and write
Range: 0mm to 99999mm
Individual element position from the bottom of the tank
Calculation is automatically performed when element spacing "Even" is selected at VH85. All of element
position must be manually entered when "Not Even" element spacing is selected at VH85.
Liquid Average Temperature:
A submerged element temperature, closest to Liquid level
= Element #3: 26.0°C (T3)
Cu100 Element #1:
25.0°C (T1)
Cu100 Element #3:
26.0°C (T3)
Cu100 Element #2:
25.5°C (T2)
Cu100 Element #4:
24.0°C (T4)
Cu100 Element #5:
24.5°C (T5)
Probe End
To Converter
Gas (Vapor) Phase
Liquid Phase
Input Signal Cable
Liquid Level
3 Operation and Description of Instrument Function

Prothermo NMT539
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3.3.5 Element Position 2: VH40 to VH49
VH40 toVH45: Position 11 to 16
Item type: read and write
Range: 0mm to 99999mm
Individual element position from tank bottom
Calculation is automatically performed when element spacing "Even" is selected at VH85. All of element
position must be manually entered when "Not Even" element spacing is selected at VH85.
VH46: Hysteresis Width
Item type: read and write
Default: 10mm
Range: 0mm to 99999mm
Element switching point hysteresis
Hysteresis, which is entered as an offset value, can prevent hunting caused by fluctuations as water
surface. The width of hysteresis changes corresponding to the width of fluctuations.
VH47: Clear Memory
Item type: select
Default: None (0)
Selection: None, Clear
Reset matrix parameter to default setting.
VH48: Gas Offset
Item type: read and write
Default: 300mm
Range: 0mm to 99999mm
When a temperature element in the gas (vapor) phase is within the range of 300mm shown below, it
is not used for the average temperature calculation of the gas temperature.
Figure 6: Gas Offset
Liquid Level
Liquid Phase
Temp. element within this range is
exluded from gas average calculation.
Temperature
Element
VH48 GAS Offset:
300mm (Default)
To NMT539 Converter
To Tank Floor
3 Operation and Description of Instrument Function

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VH49: Liquid Offset
Item type: read and write
Default: 300mm
Range: 0mm to 99999mm
When a temperature element in the liquid phase is within the range of 300mm shown below, it is not
used for the average temperature calculation of the gas temperature.
Figure 7: Liquid Offset
3.3.6 Advanced Temp: VH50 to VH59
VH53: Element Point
Item type: select
Default: 0
Selection: 0 to 15 (element #1 = 0, element #16 = 15)
Select element number for "Advanced" average calculation at VH26. Selected element position will be
displayed on VH54 "Element Position" and enable to change additional volume factor at VH55 "Element
Volume."
VH54: Element Position
Item type: read only
Range: 0m to 99999mm
Display of the selected element position at VH53.
VH55: Element Volume
Item type: read and write
Range: 1 to 99999.9
Set additional factor on the selected element at VH53. Additional volume can be added to the individ-
ual element for advanced average temperature calculation (refer to "Select Average Method" for details
on the description of VH26).
NMT539 Converter
Gas Phase
To Tank Floor
Liquid Phase
Liquid Level
Temp. element within this range is
exluded from gas average calculation.
VH07 Liquid Offset:
300mm (Default)
Temperature
Element
3 Operation and Description of Instrument Function

Prothermo NMT539
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3.3.7 Temperature Adjustment: VH70 to VH79
VH70: Element Select
Item type: select
Range: 0 to 19
Select "need adjustment" temperature element (0 = #1 element, 15 = #16 element, 19 = reference 100
Ohm resistor). Detailed value and parameter of the element selected in this matrix can be shown in,
• VH71: Zero Adjust
• VH73: Temperature X
• VH74: Position X
• VH75: Resistance X
• VH76: Resistance Adj
VH71: Zero Adjust
Item type: read and write
Default: 0
Range: -1000.0 to 1000.0
Zero adjustment of individual element selected at VH70
Comparing to precision reference thermometer, when measuring value shows minor offset value, the
reading value can be adjusted.
Set "-0.2" in this matrix if 1) selected element #2 indicates 25.4C and 2) reference thermometer indi-
cates 25.2C. After setting the value, the offset value which is based on the actual measuring value of
the element #2 will be -0.2C.
VH72: Adjust Span
Item type: read and write
Default: 1
Range: 0.8 to 1.2
The span adjustment can apply to all the installed temperature elements.
A linearized factor of given parameter is multiplied to raw element measurement for final calculation.
VH73: Temperature X
Item type: read only
Specified element temperature selected at VH70
Display the temperature of the element selected at VH70 and display the individual element tempera-
ture shown at VH10 - VH25.
The value is calculated based on the following formula.
VH73: "Temperature X" = raw element temperature x span (VH72) + zero offset (VH71)
VH74: Position X
Item type: read and write
Range: 0mm to 99999mm
A position of specified element at VH70
Each element positions are also determined when "Not Even" element spacing is selected at VH85.
VH75: Resistance X
Item type: read only
Display the element resistance selected at VH70.
NOTICE
3 Operation and Description of Instrument Function

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VH76: Resistance Adjustment
Item type: read and write
Default: 0
Range: -1000.0 to 1000.0
Adjust the element resistance at VH70.
Minor resistance adjustment can be applied on the reading value.
Set "-0.3 Ohm" in this matrix if 1) selected element #5 indicates 100.3 Ohm and 2) reference precision
resistor indicates 100.0 Ohm under the same environment condition. After setting the value, the offset
value which is based on the actual measuring value of the element #5 will be -0.3C.
VH77: Element Type
Item type: select
Selection: Pt100, Cu90, Cu100, PtCu100, JPt100
Select the element conversion formula when foreign average temperature probe is connected to
NMT539 Converter Only version.
NMT539 Converter + Temperature version always consists "Pt100" element with "Spot" element layout.
Do not change these parameters.
Element Conversion For-
mula:
Pt100 (formula above 0°C): R = -0.580195 x 10-4 x T2 + 0.390802 x T +100
Pt100 (formula below 0°C): R = -4.2735 x 10-10 x T4 + 4.273 x 10- 8 x T³ - 0.58019 x 10- 4 x T²
+ 3.90802 x T + 100
Cu90: R = 0.3809 x T + 90.4778
Cu100: R = 0.38826 x T + 90.2935
PtCu100: R = 3.3367 x 10-7 x T3 - 2.25225 x 10-5 x T2 +0.38416 x T + 100.17
VH78: Average Number
Item type: read and write
Default: 1
Range;1 to 10
Number of sampling for average calculation prior to determine final display value
Increasing number of sampling may prevent faulty display.
Additional sampling # will cause slower reaction time on value switch over. Maximum 1 sampling
sequence will take approximately 2 sec. {total 21 elements (16 temp elements and 5 integrated
reference resistors)}
NH79: Protect Code
Item type: read and write
Default: 0
Range: 0 to 999
Access code 530 to enable select and write command available
NOTICE
CAUTION
NOTICE
3 Operation and Description of Instrument Function

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3.3.8 Device Setting 1: VH80 to VH89
VH80: Present Error
Item type: read only
Display the error message.
Following code will be indicated.
Error Code 0: No error presence
1: Common line open
2: undetermined
3: #1 element open
4: #1 element short
5: #2 element open
6: #2 element short
7: #3 element open
8: #3 element short
9: #4 element open
10: #4 element short
11: #5 element open
12: #5 element short
13: #6 element open
14: #6 element short
15: #7 element open
16: #7 element short
17: #8 element open
18: #8 element short
19: #9 element open
20: #9 element short
21: #10 element open
22: #10 element short
23: #0 element over range
24: Memory defect (ROM)
25: #11 element open
26: #11 element short
27: #12 element open
28: #12 element short
29: Element exposed (liquid level below #1 element position)
30: undetermined
31: undetermined
32: Low power supply
33: #13 element open
34: #13 element short
35: #14 element open
36: #14 element short
37: #15 element open
38: #15 element short
39: #16 element open
40: #16 element short
41: Memory defect (RAM)
42: Memory defect (EEROM)
43: WB line open
44: WB line short
3 Operation and Description of Instrument Function

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VH81: Temperature Unit
Item type: select
Default: °C
Selection: °C, °F, °K
Select the temperature display unit.
Based on universal local HART setting, °C(HART code: 32), °F (HART code: 33), or °K (HART code: 35)
is available.
Selection of temperature display unit only applies to reply data from NMT539. Data transmission from
host gauge (NRF590 or NMS5/NMS7) to NMT539 is performed by °C unit only.
VH82: Element Number
Item type: read and write
Default: 10 (NMT539 Converter Only version)
Range: 1 to 16
Entering # of available temperature element.
This function mainly used with NMT539 Converter Only version.
Do not change the default parameter on NMT539 Converter + Temperature version. # of element on
this version is pre-determined by customer’s choice. It may cause faulty calculation or unnecessary
error display.
VH83: No. of Preambles
Item type: read and write
Default: 5
Range: 2 to 20
Set # of preamble for local HART communication.
Do not change default value. Changing value may cause communication error.
VH84: Distance Unit
Item type: select
Default: mm
Selection: ft., m, inch, mm
Select the level display unit.
The unit applies to liquid level display on VH02 "Liquid Level" and VH50 "Water Bottom Level."
Level units are coded based on universal local HART setting, ft. (HART code: 44), m (HART code: 45),
inch (HART code: 47), mm (HART code: 49).
VH85: Kind of Interval
Item type: select
Default: Even Interval (NMT539 Converter Only version)
Selection: Even Interval, Not Even
Select the element interval depending on the spacing layout.
This function is normally used for NMT539 Converter Only version.
Do not change parameter on NMT539 Converter + Temperature version unless repairing.
Interval and individual element positions are physically determined at factory.
NOTICE
CAUTION
CAUTION
WARNING
3 Operation and Description of Instrument Function

Prothermo NMT539
20 Endress+Hauser
VH86: Bottom Point
Item type: read and write
Default: 500mm
Range: 0mm to 99999mm
Position of #1 element that is also called "Bottom Point."
#1 element position becomes critically important when "Even Interval" is selected at VH85 because
remaining element positions rely on this location of Bottom Point.
VH87: Element Interval
Item type: read and write
Default: 1000mm (NMT539 Converter Only version)
Range: 0mm to 99999mm
Designate Even Interval spacing.
Changing element interval and setting element position are only applied to reconfigure switching
points for average temperature calculation. The physical position of element does not change.
VH88: Short Error
Item type: read and write
Default: -49.5
Range: -49.5 to 359.5
A type of error message when any of element has short circuit
Method of display can be configured at VH92 "Error Display Select."
VH89: Open Error
Item type: read write
Default: 359.0
Range: -49.5 to 359.5
A type of error message when any of element has open circuit
Method of display can be configured at VH92 "Error Display Select."
3.3.9 Device setting 2: VH90 to VH99
VH90: Device ID Number
Item type: read and write
Default: 0
Range: 0 to 16777214
In order to distinguish own device ID when NMT539 is connected in multi drop local HART loop.
Changing device ID may lead to communication error because of mismatched pre-registered device ID
and local HART address.
VH91: Previous Error
Item type: read only
Display the error history.
Coded error message will be the same contents as VH80.
VH92: Error Dis. Sel.
Item type: select
Default: 0_OFF
Selection: 0_OFF, 1_ON
Select the type of display of VH88 "Short Error Value" and VH89 "Open Error Value".
0_OFF: These 2 error messages will not be transmitted to the connected host gauge.
This function automatically excludes defected element in average temperature calculation.
1_ON: Error message will be transmitted to the host gauge. As a result, VH88 and 89"s numeric error
code will be displayed on host gauge default screen and may transmit to upper receiver as well.
NOTICE
CAUTION
3 Operation and Description of Instrument Function