Novus TXMINI-M12 User manual

NOVUS AUTOMATION 1/3
TXMINI
-M12 / TXMINI TRANSMITTER
OPERATING MANUAL
– V1.0x H
INTRODUCTION
The TxMini-M12 Transmitter is a 4-20 mA 2-wires temperature
transmitter for head mount, powered by the current loop. Its
configuration is accomplished by connecting the TxConfig-M12
interface configuration. The configuration does not require that the
transmitter be powered.
The output current is linearized according to the selected input
sensor and adjusted to the configured range.
SPECIFICATIONS
Sensor Input: User defined. The supported sensors are listed in Table
1, along with their maximum ranges.
Pt100: Type 3-wire, Excitation 0.8 mA, α= 0.00385, according
IEC 60751 (ITS-90).
Pt1000: Type 3-wire, Excitation 0.8 mA, α= 0.00385, according
NBR 13773. IEC 60751 (ITS-90).
For 2-wire sensors, tie terminals 3 and 4 together.
Switch-on delay: < 2.5 s. The accuracy is only guaranteed after 15
minutes.
Terms of reference:ambient: 25 ° C (77 °F); voltage: 24 Vdc, load:
250 Ω; settling time: 15 minutes.
Temperature Effect:<± 0.2 % / 25 °C
Response time: typical 1.6 s
Maximum voltage allowed at input terminals no sensor:3 V.
RTD current:800 µA.
RTD cable resistance effect: 0.005 °C / Ω.
Maximum allowable cable resistance for RTD: 25 Ω.
Sensor Type
Typical
Accuracy
Minimum
Accuracy
Pt100 / Pt1000
0.1 %
0.2 %
Table 1 – Calibration error, percentage of the full measurement range
Power supply influence: 0.006 % / V typical (percentage of the full
measure range).
Output:4-20 mA or 20-4 mA current, 2-wire; linear in relation to the
temperature measurement by the selected sensor.
Output Resolution: 2 µA.
Power supply: 8 to 35 Vdc, across the transmitter;
Maximum load (RL):RL (max.) = (Vdc – 8) / 0.02 [Ω]
Where: Vdc= Power supply voltage (8-35 Vdc)
Operating Temperature: -40 to 85 °C (-40 to 185 °F)
Humidity: 0 to 90 % RH
Electromagnetic Compatibility:EN 61326-1:2006
No electrical isolation between input and output.
Internal protection against polarity inversion.
Cold junction compensation for thermocouples.
Connection Wire Cross Section: 0.14 a 1.5 mm²
Screw Tightening: 0.8 Nm.
Housing: Polyamide.
Sensor Type Maximum
Measurement Range
Minimum
Measurement Range
Pt100 -200 to 650 °C
(-328 to 1202 °F)
40 °C
(104 °F)
Pt1000 -200 to 650 °C
(-328 to 1202 °F)
40 °C
(104 °F)
Table 2– Sensors accepted by the transmitter
Order Codes:
-P/N: 8806060406: TxMini-M12 transmitter;
-P/N: 8816021079: TxConfig-M12 Interface.
-P/N: 8806060506: TxMini Transmitter (transmitter can only be
configured during production).
-P/N: 8806065000: M12 Connector Cable for TxMini-M12
(accessory)
CONFIGURATION
The sensor offset can be adjusted through the TxConfig II software.
The USB cable may be connected to the transmitter without causing
any measurement errors.
The user must select the sensor and most suitable range to the
process. The chosen range must not exceed the maximum range
specified for that sensor and should not be narrower than the
minimum range for that same sensor.
SOFTWARE CONFIGURATION:
Fig. 1 – TxConfig II software main screen
The communication interface TxConfig-
M12 is not
electrically isolated from the transmitter’s input.

TxMini-M12 Transmitter
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The fields in the screen mean:
1. 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.
2. Sensor: Select the type of sensor to be used. See Table 1.
3. Measuring Range: Sets de measurement range of the
transmitter.
Lower Range Limit: equivalent temperature for a current of 4
mA.
Upper Range 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
Do not set a lower band (span) that the Minimum Range
indicated below in this same field. See Table 1 of this manual.
4. Sensor Failure: It establishes the output behavior, when the
transmitter indicates a failure:
Minimum: output current goes to < 3.8 mA (down-scale), typically
used for refrigeration.
Maximum: output current goes to > 20.5 mA (up-scale), typically
used for heating.
5. Zero Correction: It corrects small deviations presented in the
transmitter output, for example, when the sensor is replaced.
6. Send Configuration: It applies the new setup. Once sent, the
setup will be immediately adopted by the transmitter.
7. Read Configuration: Reads the current setup in the transmitter
connected. The screen now presents the current setup that may
be changed by the user.
FACTORY SETTING:
•Sensor: Pt100 3-wire, range 0 to 100 °C
•Sensor failure: upscale (maximum).
•0 °C zero correction.
•Unit: °C;
•Output: 4 to 20 mA.
Upon purchase order, the user can define a specific setup.
MECHANICAL INSTALLATION
TxMini-M12 Transmitter was designed to be installed in tubes and
other small places. 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.
Fig. 2– Dimensions of the transmitter
ELECTRICAL INSTALLATION
•Polyamide enclosure.
•Section of the cable used: 0.14 to 1.5 mm ²
RECOMMENDATIONS FOR INSTALLATION
•Sensor signals conductors must go through the plant system
separate from power leads (loop), if possible in grounded
conduits.
•The instruments must be powered from the instrumentation power
supply circuit.
•In control and monitoring applications is essential to consider
what can happen when any part of the system fails.
•It is recommended the use of suppressors in contact coils,
solenoids and any inductive load.
POWER AND COMMUNICATION CONNECTION
Terminal 2 is used to communicate with the transmitter (TxConfig-
M12 interface must be used).
Terminal 4 can be connected to cable shield, if needed.
1 LOOP +
2
COMM
3
LOOP -
4 SHIELD
Fig. 3 – Output 4-20 mA (without M12)
Note: this model has no configuration interface and can only be
configured during production.

TxMini-M12 Transmitter
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Fig. 4 – TxMini-M12 / TxMini Connection Diagram
SENSOR CONNECTION
Terminals 1, 2 and 3 are dedicated to sensor connection. Terminals
1 and 2 must be shorted, as shown in the figure below.
Fig. 5– Input 3-wire Pt100 / Pt1000
M12 CABLE CONECTION
See below guidelines for making or purchasing the M12 cable.
Fig. 6 – Connecting pins for M12 cable mounting
For appropriate cable resistance compensation, the same cable type
should be used for all terminals. Maximum wire resistance is 25 Ω.
Usage of a 3 or 4 wire with conductors of equal length and gauge is
recommended (cable not supplied).
OPERATION
The sensor offset can be adjusted through the TxConfig II software.
The USB cable may be connected to the transmitter without causing
any measurement errors.
The user must select the sensor and most suitable range to the
process. The chosen range must not exceed the maximum range
specified for that sensor and should not be narrower than the
minimum range for that same sensor.
It is important to note that the transmitter accuracy is based on the
maximum range of the sensor used, even when a narrower range is
programmed. Example:
•The Pt100 input has a max. range of –200 to +650 °C. Its
accuracy is 0.2 % of the full range, resulting in a maximum
allowed error of 1.7 °C (0.2 % of 850 °C).
•This error may be present even when a narrower range is
configured for the sensor (for example: 0 to 100 °C.).
Note: When Pt100 simulators are used with the transmitter, make
sure the excitation current of the simulator is compatible with the
Pt100 excitation current of the transmitter, which is 0.8 mA.
WARRANTY
Warranty conditions are on our web site
www.novusautomation.com/warranty.