NOVUS TxIsoBlock-HRT Configurable Head Mount Temperature Transmitter Instruction Manual

: June 8, 2024
: Novus

Table of Contents

INTRODUCTION
SPECIFICATIONS
CONFIGURATION
MECHANICAL INSTALLATION
ELECTRICAL INSTALLATION
OPERATION
WARRANTY
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TxIsoBlock-HRT
TEMPERATURE TRANSMITTER – OPERATING MANUAL – V1.1x B

INTRODUCTION

The TxIsoBlock-HRT is a configurable head mount temperature transmitter widely required in various industrial processes. Its universal input can be configured to read RTDs, thermocouples and mV signals.
It converts the input signal into a 4-20 mA linear output proportional to the configured range. The TxIsoBlock-HRT uses the HART® communication protocol over the 4-20 mA output current loop.
The input and output are electrically isolated, enhancing their performance and user and system safety.

SPECIFICATIONS

Sensor input: User defined. The supported sensors are listed in Table 1, along with their maximum ranges.
Thermocouples: Types J, K, R, S, T, N, E and B, according to IEC 60584 (ITS-90).
Impedance >> 1 MΩ Pt100: Excitation 0.15 mA, α= 0.00385, according IEC 60751 (ITS-90).
For 2-wire sensors, tie terminals 3 and 4 together. Pt1000: Excitation 0.20 mA, α= 0.00385, according IEC 60751 (ITS-90).
For 2-wire sensors, tie terminals 3 and 4 together.
NTC R25°C: 10 kΩ ±1 %, B25/85 = 3435.
Voltage: 0 to 50 mVdc. Impedance >> 1 MΩ.

Sensor Type| Maximum Measurement Range| Minimum Retransmission Range
---|---|---
Thermocouple K| -150 to 1370 °C
(-238 to 2498 °F)| 50 °C
(90 °F)
Thermocouple J| -100 to 760 °C
(-148 to 1400 °F)| 50 °C
(90 °F)
Thermocouple R| -50 to 1760 °C

(-58 to 3200 °F)

Table 1 – Sensors accepted by the transmitter
Switch-on delay: < 10 s with damping filter set to factory setting.
The accuracy is only guaranteed after 15 min. Terms of reference for accuracy: Ambient: 25 °C (77 °F); voltage: 24 Vdc, load: 250 Ω. Stabilization time of 15 minutes after any setting is required. Temperature effect: NTC: < 0.11 % FS / 25 °C (45 °F)
Other sensors: < 0.05 % FS / 25 °C (45 °F) (FS = Full Scale).
Response time: Typical 6 s with factory damping filter. This is the maximum time between a temperature step being applied in the input and the output reaching 90 % of the corresponding value. HART protocol version: 7.
RTD cable resistance effect: 0.005 °C (0.009 °F) / Ω.
Maximum allowable cable resistance for RTD: 25 Ω.
Accuracy: Calibration error in relation to sensor measuring range (Full Scale).

Sensor Type	CURRENT LOOP	HART
Typical Accuracy	Minimum Accuracy	Typical
Accuracy	Minimum Accuracy

Pt100 (-200 to 650 °C)
(-328 to 1202 °F)| 0.08 %| 0.15 %| 0.05 %| 0.15 %
Pt1000 (-200 to 650 °C)
(-328 to 1202 °F)| 0.07 %| 0.15 %| 0.04 %| 0.15 %
K, J, R, S, T, N, E, B| 0.07 % ( )| 0.15 % ( )| 0.04 % ( )| 0.15 % ( )
mV| 0.07 %| 0.15 %| 0.04 %| 0.15 %
NTC| 0.20 °C| 0.45 °C| 0.15 °C| 0.45 °C
(0.36 °F)| (0.81 °F)| (0.27 °F)| (0.81 °F)

Table 2 – Accuracy of input types
*() Add Cold Junction compensation: < ± 1 °C (1.8°F).
Power supply influence: < 0.005 % / V (percentage of the full measure range).
Output (4-20 mA): 4-20 mA current, 2-wired; linear and proportional to the configured range.
Output resolution (4-20 mA): 0.25 µA.
Power supply: 8.5 to 36 Vdc (output 4-20 mA).
Maximum load (RL): RL (max.) = (Vdc – 8.5) / 0.0215 [Ω] Where: Vdc = Power supply voltage (8.5 to 36 Vdc)
Operating temperature: -40 to 85 °C (-40 to 185 °F).
Humidity: 0 to 90% RH.
It presents electrical isolation between input and output of 1.5 kVrms.
Internal protection against reverse polarity of the supply voltage.
Cold Junction compensation for thermocouples.
Connection wire cross section: 0.14 to 1.5 mm².
Screw Tightening: 0.8 Nm.
Housing: Polyamide.
Standards and Certifications:** NAMUR NE-43 standard and CE and HART® certifications.

CONFIGURATION

When the transmitter is used with the factory setting, no further action is required and the transmitter is ready to be installed.
Changes to the configuration are possible through the TxConfig II software, provided free of charge.
The TxConfig II configuration software allows the device configuration.
A TxConfig-HRT interface is required to allow the communication between a computer and the device. The Txconfig II configuration software is continuously updated and new versions can be downloaded at no charge from the manufacturer’s website. To install, execute the
TxConfigIISetup.exe file and follow the instructions.
The interface connects the transmitter to the computer, as shown in Fig. 1:

SOFTWARE CONFIGURATION

The fields in the screen mean:

General Information: This field shows information that identifying the transmitter. This information should be sent to the manufacturer in an eventual request for technical assistance.
Sensor: Select the type of sensor to be used. See Table 1.
Unit: Select the temperature unit to °C (Celsius) or °F (Fahrenheit).
Range: Sets de measurement range of the transmitter.
Lowest Limit: Equivalent temperature for a current of 4 mA.
Highest Limit: Equivalent temperature for a current of 20 mA.
Sensor Range: The values chosen cannot exceed the Range of Sensor shown in this field. See Table 1 of this manual.
Minimum Range: It is not possible to establish a range with a span less than the Minimum Range value indicated below in this field. See Table 1 of this manual.
HART Information:
Tag: Field with a brief identification of the device (up to 8 characters).
Descriptor: Descriptor used by the master for registering (up to 16 characters).
Message: Message used by the master for registering (up to 32 characters).
Sensor Failure: It establishes the output behavior, when the transmitter indicates a failure, as recommended NAMUR NE 43:
Minimum: Output current goes to <= 3.6 mA (down-scale), typically used for refrigeration.
Maximum: Output current goes to >= 21.5 mA (up-scale), typically used for heating.
Zero Offset: It corrects small deviations presented in the transmitter output, for example, when the sensor is replaced.
Filter: Damping filter.
The damping filter changes the response time of the transmitter in order to smooth the variations in the output. The value set in the filter indicates the time interval at which the PV will reach 63% of its final value.
The factory setting is 1.0 s and can be changed from 0 s to 32 s. In a case with variation from 0 ° C to 100 ° C, considering the factory configuration and after 1.0 s, the PV value will be 63 °C.
With zero value in the filter, the function is disabled.
Enable write protection: When activated, the configuration setting is not allowed.
Send Configuration: It applies the new setup. Once sent, the setup will be immediately adopted by the transmitter.
Read Configuration: Reads the current setup in the transmitter connected. The screen now presents the current setup that may be changed by the user.
Polling Address: Dynamic (i.e., configurable) address that allows devices to be quickly identified on a network.
Enable Current Loop: When disabled, the current remains at 4 mA.

FACTORY SETTING

Sensor: Pt100 3-wire, range 0 to 100 °C
Maximum output for sensor failure
0 °C zero correction
Unit: °C
Filter: 1.0 s
Address: 0
Current Loop: Enabled

**** It is possible to configure the device via third-party software and with the help of an FSK modem to perform HART® communication.
An EDD (Electronic Device Descriptor) file is available, which can be used with compatible systems and allows access to the settings and supervise the transmitter.
To put the devices on the same network (or put them in multidrop mode), they must have different polling addresses and the current loop must be disabled.

MECHANICAL INSTALLATION

The TxIsoBlock-HRT transmitter is suitable to be installed in heads. Vibrations, moisture and extreme temperatures, electro-magnetic interference, high voltage and other interferences can permanently damage the unit and could cause error in the measured value.
DIMENSIONS

ELECTRICAL INSTALLATION

Polyamide housing to the terminals.
Section of the cable used: 0.14 to 1.5 mm².
Recommended torque in the terminal: 0.8 Nm.

RECOMMENDATIONS FOR INSTALLATION

Conductors of small electrical signals must be distant from activation or high-tension/current conductors, preferably passing through grounded conduits.
A specific electrical power supply network should be provided for instruments use only.
In controlling and monitoring applications, possible consequences of any system failure must be considered in advance.
RC filters (47 Ω and 100nF, serial) in inductor charges (contactors, solenoids, etc.) are recommended.

ELECTRICAL CONNECTIONS
The figures next show the electrical connections required. The terminals 3, 4, 5 and 6 are dedicated to the sensor connection.
LOAD represents the 4-20 mA current measuring device (indicator, controller, recorder, etc.).
Pt100 / Pt1000 2-WIRE
Note: When used the Pt100 / Pt1000 2-wire, the terminals 3 and 4 must be interconnected, according to the figure below.
To use the Pt100 / Pt1000 2-wire, you must configure the Pt100/ Pt1000 3-wire option in TxConfig II.
The Pt100 / Pt1000 wire length should be less than 30 cm to maintain the measurement error within specifications (electrical resistance).

Pt100 / Pt1000 3-WIRE

Pt100 / Pt1000 4-WIRE
Pt100 / Pt1000 3 and 4-wire: The use of wires with same length and gauge is recommended for a better resistance compensation. The transmitter compensates up to 25 Ω per wire.
THERMOCOUPLE

voltage (0-50 mV)

NTC

OUTPUT (4-20 mA)

OPERATION

The transmitter is factory calibrated with standardized sensors, not requiring any adjustment by the user.
Small corrections can be accomplished through the TxConfig II software (in units of temperature).
The user may choose the sensor and the range that best fits its application. The range chosen must not exceed the maximum measuring range defined for the sensor and must not be less than the minimum range for the sensor.
It is important to note that the accuracy of the transmitter refers to the maximum range of the sensor used, regardless of the actual range. Example:

The sensor Pt100 has a max. range of -200 to 650 °C and total accuracy de 0.08 %.
Thus, we can have an absolute error up to 0.68 °C (0.08% of 850 °C).
This error is possible in a wide range as the maximum (-200 to 650 ° C) or in a narrower range, set by the user as (example) 0 to 100 ° C.