MTR265B
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Introduction MTR265B is an IP65 rated wireless transmitter for Pt100, TC and mV inputs. The wireless concept allows easy installation, implementation and expansion also in difficult installation sites. Warnings MTR265B transmitter contains a primary battery and a low-power license-free ISM band radio transmitter operating at 433.92 MHz. Observe local regulations concerning the proper disposal of batteries and the use of the integrated radio transmitter. Trademarks Any trademarks mentioned in this manual are the property of the respective trademark owners. Manufacturer Nokeval Oy Rounionkatu...

Description General MTR265B transmitter is housed in impact resistant plastic enclosure which, when properly screwed together, is watertight to IP 65. The joint between the two parts is sealed with one rubber O-ring. The transmitter fulfills the mechanical and measuring accuracy requirements of the EN 13485 standard. It also conforms to the requirements of the standards EN 13486 and EN 12830 where applicable. The transmitter is delivered with a M12 male connector for connecting cable sensors and with MTR265B-SP wall mounting bracket for fastening. MTR265B transmitter operates in...

default interval is 27 seconds for MTR265B. Transmit interval can be individually adjusted for each transmitter as instructed in the chapter Configuring. The following table presents maximum number of transmitters with different intervals and with different numbers of repeaters. Dimensions The following pictures present some dimensions in millimeters:

The total height of MTR265B is 227 mm including removable connector. There are two mounting holes on the corners of MTR265B-SP wall mounting bracket which have a diameter of 4,5 mm. Choose correct type of screws depending on the wall material and with maximum of 4mm diameter. Mounting location Radio technical perspective MTR265B transmitter has a typical indoor maximum range of 50...100 m depending on the number and quality of obstacles between the transmitter and the receiver. The best range is achieved when there is a line-of-sight between the transmitter and receiver. In unrestricted...

A good installation location is: • on a wall as far away as possible from the door and the evaporator/radiator, • at a height of about 3/4 of the height of the space, • and where people rarely move about, • and where air can freely move around. Considerations for oven applications In the oven temperature measuring the maximum temperature of the sensor cable insulation has to be taken into account. For Teflon-insulated cables maximum is 250 °C. For rubber- and PVC insulated cables maximum is 105 °C. For glass fiber insulated special cables maximum is 400 °C. In the temperatures over 250 °C...

Thermocouple connections Thermocouple sensors have typically 2 meter long cables. If this length is not enough, the sensor cable can be extended, but this has to be made with correct type of thermocouple cable, copper cable must not be used. The most common thermocouple is K-type and the correct extension cable for it in below 105 °C ambient temperature is for example JHAS-K-7/0.2 cable. With higher ambient temperatures teflon covered extension cables can be used up to 250 °C maximum temperature. MTR265B is factory set for Pt100 3-wire sensor. Any other sensor settings have to be mentioned...

Maintenance Cleaning The plastic parts can be cleaned with a soft cloth and soap water. Cleaning with isopropyl alcohol is also allowed. When cleaning with liquids, verify that the transmitter housing is securely sealed and screwed together to prevent liquids from entering the enclosures. Battery General MTR265B is powered by single 1.5 V AAA-size alkaline battery. Life time Battery life time depends on the used transmit interval. Ambient temperature also has an effect on the achievable battery life, which will be significantly shorter in extremely cold and very hot environments. The...

5. Replace the battery with a high quality alkaline 1.5 V size AAA battery observing the correct polarity. 6. Carefully insert the two enclosure parts back together. 7. Screw the enclosure parts back together. 8. Screw the external sensor back to the transmitter. 9. Push the transmitter back to the wall mounting bracket, if using one. 10. Properly dispose the used battery observing the local regulations Calibration certificates Individual calibration certificate is available for each calibrated MTR265B transmitter. To avoid printing, handling, sending and storing a large number of paper...

Programming cable MTR265B transmitter has an internal Conf-programming connector, found on many other Nokeval products as well. Transmitter enclosure must be opened in order to reveal this connector and to be able to connect the programming cable. The following programming cables are available: • 6790 Hand held programmer + POL3-PIN adapter • MekuWin program + DCS772 USB-POL-converter + POL3-pin adapter • MekuWin program + POL-RS232 programming cable + POL3-PIN adapter A free Windows program Nokeval MekuWin is available in the address www.nokeval.com in the location Software » Configuration...

In / Sensor This setting selects the sensor type which can be one of the following values: Value Description Pt Standard platinum RTDs (IEC 60751) Ohm No sensor linearization, result of resistance measurement is sent in Ohms Tc Thermocouple sensor with Receiver side linearization TcB Linearization for B-type thermocouple TcC Linearization for C-type thermocouple TcD Linearization for D-type thermocouple TcE Linearization for E-type thermocouple TcG Linearization for G-type thermocouple TcJ Linearization for J-type thermocouple TcK Linearization for K-type thermocouple TcL Linearization for...

Out / Period This sets the transmit period or interval of all measurement results. Allowed range is from 2 to 127 units. This corresponds to an approximate range of 5 seconds to 5 minutes and 43 seconds because each unit represents about 2.7 seconds in room temperature. Actual transmit interval varies slightly depending on ambient temperature. This variation is intentional to reduce the chance of collisions between transmitters. This setting has a direct effect on battery endurance. Avoid using unnecessarily short transmit intervals because this causes the battery to drain faster and also...