NOVUS TxMini-M12 Transmitter User Guide

NOVUS TxMini-M12 Transmitter

USER GUIDE

TXMINI-M12 / TXMINI TRANSMITTER

1. INTRODUCTION

TxMini-M12 Transmitter is a 4-20 mA 2-wires temperature transmitter for head mount, powered by the current loop. It can be configured using SigNow or TxConfig II software or SigNow app.
The output current is linearized according to the selected input sensor and adjusted to the configured range.

2. 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 to IEC 60751 (ITS-90).
Pt1000: Type 3-wire, Excitation 0.8 mA, α = 0.00385, according to 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.

Reference terms: 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.

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 to 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).

3. CONFIGURATION

The factory setting of the transmitter is for Pt100 input with a range of 0 to 100 °C and output for maximum current in case of error. When using the transmitter with this setting, no further commissioning is required. In this case, its installation can be carried out immediately.

When it is necessary to change the configuration of the equipment, you should use SigNow software, TxConfig II software, or SigNow app.

To configure the equipment through any of the software, you must connect the TxConfig-M12 Configuration Interface (purchased from the manufacturer or its authorized representatives) to the USB port of the computer used and run the selected software.

To configure the device via the SigNow app, you need to use an OTG cable with the TxConfig-DIN43650 Configuration Interface and proceed with the recognition process (see SMARTPHONE CONNECTIONS chapter).

On NOVUS website, you can download the configuration software for free. To install it, simply run the file SigNowSetup.exe or the file TxConfigIISetup.exe and follow the instructions in the installer.
The SigNow setup application can be downloaded for free from Google Play Store.

The communication interface TxConfig-M12 is not electrically isolated from the transmitter input.

3.1 SOFTWARE AND APP

3.1.1 SIGNOW SOFTWARE
When you run the SigNow software and make the connection to the equipment, the following screen will be displayed:

Figure 1 – SigNow settings screen

The bottom part of the screen displays information about the model, serial number, and firmware version.
The configuration screen is divided into 2 sections: General and Diagnostics.
In the General screen (shown above), you can configure the equipment by setting values and information for the following parameters:

1. Sensor type: It allows you to select the type of sensor to be used. See Table 1.
2. Temperature unit: It allows you to set the temperature unit to be used.
3. Lower limit: It allows you to set the minimum limit for the transmitter measurement range.
4. Upper limit: It allows you to set the minimum limit for the transmitter measurement range.
5. Output status (Sensor failure): It allows you to establish the output behavior when the transmitter indicates a failure.
6. Output type: It allows you to define the type of output to be used: 4 to 20 mA or 20 to 4 mA.
7. Zero correction: It allows you to correct small deviations presented in the transmitter output, for example, when replacing the sensor.

In the SigNow manual, available on NOVUS website, you can find more information about the diagnostic process.

3.1.2 TXCONFIG II SOFTWARE
When you run the TxConfig II software and make the connection to the equipment, the following screen will be displayed:

Figure 2 – TxConfig II software main screen

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: It allows you to select the type of sensor to be used. See Table

1. 3. Measuring Range: It allows you to set de measurement range of the transmitter.
   Lower Range Limit: Equivalent temperature for a 4-mA current. Upper Range Limit: Equivalent temperature for a 20-mA current. Sensor Range: The values chosen cannot exceed the sensor range shown in this field. See Table 1.
   Minimum Range: Do not set a lower band (span) that the Minimum Range indicated below in this same field. See Table 1.
   4. Sensor Failure: It allows you to establish the output behavior when the transmitter indicates a failure:
   Minimum: The output current goes to < 3.8 mA (down-scale). Typically used for refrigeration.
   Maximum: The output current goes to > 20.5 mA (up-scale). Typically used for heating.
   5. Zero Correction: It allows you to correct small deviations presented in the transmitter output, for example, when replacing the sensor.
   6. Send Configuration: It allows you to apply the new setup. Once sent, the setup will be immediately adopted by the transmitter.
   7. Read Configuration: It allows you to read the current setup in the transmitter connected. The screen now presents the current setup that may be changed by the user.

3.1.3 SIGNOW APP
When using an OTG cable and the TxConfig-M12 Configuration Interface to connect the equipment to your smartphone and run the SigNow app (see SMARTPHONE CONNECTIONS chapter), you must first enable the use of TxConfig-M12.
The interface will act as an intermediary for the connection:

Figure 3 – Using TxConfig-M12

After that, the app will recognize the equipment and show the main screen:

Figure 4 – Main screen

To configure the equipment, just click the Configuration button. Then, the app will show the main screen of the TxMini-M12 Configuration section:

Figure 5 – Information screen

This screen shows information about the equipment, such as name, serial number, and firmware version.
When you open the Config section, you can configure the parameters displayed in the SIGNOW SOFTWARE section.
In the SigNow manual, available on NOVUS website, you can find more information about the buttons and the diagnostic process.

3.2 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, you can define a specific setup.

4. SMARTPHONE CONNECTIONS

Smartphones with On the Go (OTG) technology can be directly connected to the device via the Micro-USB input. Using the TxConfig-M12 Configuration Interface, it is possible to recognize and configure a TxMini-M12 by running the SigNow app.

To do this, as shown in Figure 6, you need to observe how to connect the OTG cable to the equipment:

Figure 6 – OTG cable

Incorrect positioning of the cable tip can cause the equipment not to be recognized by the app.

5. MECHANICAL INSTALLATION

TxMini-M12 Transmitter was designed to be installed in tubes and other small places.
Vibrations, moisture and extreme temperatures, electromagnetic interference, high voltage, and other interferences can permanently damage the equipment and could cause error in the measured value.

Figure 7 – Dimensions of the transmitter

6. ELECTRICAL INSTALLATION

• Polyamide housing.
• Section of the cable used: 0.14 to 1.5 mm².

6.1 INSTALLATION RECOMMENDATIONS

• 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.

6.2 POWER AND COMMUNICATION CONNECTION

Terminal 2 is used to communicate with the transmitter (TxConfig-M12 Configuration Interface must be used).
Terminal 4 can be connected to cable shield, if needed.

Figure 8 – Output 4-20 mA (without M12)

Note: This model has no configuration interface and can only be configured during production.

6.3 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:

M12 CABLE CONECTION
The information below shows how to make or buy an M12 cable:

Figure 11 – 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.
It is recommended to use 3- or 4-wire with conductors of equal length and gauge (cable not supplied).

7. OPERATION

You can change the sensor Offset via SigNow and TxConfig II software or the SigNow app.
You 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.

8. WARRANTY

Warranty conditions are on our web site
www.novusautomation.com/warranty.

FAQ

Q: How do I download the configuration software?

A: You can download the software for free from NOVUS website by running the provided setup files.

Q: What is the maximum allowable cable resistance for RTD?

A: The maximum allowable cable resistance for RTD is 25Ω.

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