M2CH Sensor Interface Board
- Manufacturer: Nesa
- Category: Process isolators, Signal converters, INSTRUMENTATION
The NESA M2CH board is a sensor interface board that expands the TMF datalogger to make sensor wiring more flexible and increase surge protection. A single board acquires and protects two data channels.
It consists of a double sensor connection strip, a double PS/2 DIN connector for direct connection to the TMF datalogger, and a protection stage with gas-filled diodes and varistors, providing dual protection against overvoltages and indirect lightning strikes. Rated discharge current (10/350µs) 500A, rated voltage 25V max, rated current 300mA, operating temperature -40–+85°C, and IP20 rating. It offers protection against overvoltages caused by lightning strikes, such as those used in wind data acquisition (wind turbines).
Key points
- 2 data channels with a single board; TMF datalogger add-on
- Gas diodes and varistors; dual level protection against overvoltages and indirect lightning; 500A (10/350µs)
- Nominal voltage 25V max; nominal current 300mA; -40÷+85°C; IP20
- Reference voltage of 2V on pin 5, with a minimum load greater than 2K
- Power supply from the TMF datalogger battery or a separate source via screw terminal; ground connection via faston connector
- Standard configurations by color label: red 4÷20mA, white 0÷2V, Pt100 and «open collector» max. 1000Hz, blue 0÷5V, yellow sinusoidal
Technical Frequently Asked Questions
What is M2CH?
A sensor interface board that expands the TMF datalogger: it makes sensor wiring more flexible and increases surge protection, with two data channels per board.
What protection does it have?
Gas diode and varistor stage, with dual level protection against overvoltages and indirect lightning strikes. Rated discharge current (10/350µs) 500A.
What signals does it support?
According to the color label: red 4÷20mA to 2 and 4 wires; white 0÷2V, Pt100 and frequency sensor «open collector» max. 1000Hz; blue 0÷5V; yellow sinusoidal sensor.
How does it feed?
Power is supplied from the battery that powers the TMF datalogger or, alternatively, from a separate power supply via screw terminals. Grounding is provided via a faston connector.
What reference voltage does it give?
2V precision on pin 5, with minimum load on the major pin of 2K.
What references are there?
M2CH.B (blue), M2CH.R (red), M2CH.W (white) and M2CH.Y (yellow).
Properties
| Feature | Specification |
|---|---|
| Function and protection | |
| Product type | Sensor interface board |
| Number of channels | 2 data channels |
| Complement to | TMF Datalogger |
| Protection stage | Gas diodes and varistors |
| Level of protection | Double level protection against overvoltages and indirect lightning |
| Nominal discharge current (10/350µs) | 500A |
| Nominal voltage | 25V max |
| Nominal current | 300mA |
| Reference voltage | 2V precision, on pin 5 |
| Minimum load on pin 5 | Greater than 2K |
| Input signals and connections | |
| Color label | It distinguishes the standard configuration; it usually has the associated channel number printed on it. |
| Red label | 4÷20mA 2-wire (loop powered) and 4-wire |
| White label | 0-2V, Pt100 and «open collector» frequency sensor» |
| Blue label | 0÷5V (0-1V divider) |
| Yellow label | sinusoidal sensor |
| Open collector frequency« | Max. 1000Hz |
| 0÷5V Divider | The signal is reduced 5 times |
| Sensor connection | Double power strip |
| Connecting to the datalogger | Dual PS2 DIN connector, direct connection to the TMF datalogger |
| Power supply, environment, and mechanical data | |
| Feeding | From the battery that powers the TMF datalogger |
| Alternative diet | Separate power supply, via screw terminal |
| Grounding | Faston connector, for effective surge protection |
| Operating temperature | -40 to +85°C |
| Degree of protection | IP20 |
| Format | DIN rail mounting plate on tray |
| Reference | Configuration |
|---|---|
| M2CH.BM2CHB | Label: Blue · Version for: 0÷5Vdc, 0÷10Vdc or other voltage range, or specific sensors from other manufacturers |
| M2CH.RM2CHR | Label: Red · Version for: 0÷20mA or 4÷20mA, or specific sensors from other manufacturers |
| M2CH.WM2CHW | Label: White · Version for: 0÷2Vdc, Pt100 or mV sensors, frequencies, pulses, or specific sensors from other manufacturers |
| M2CH.YM2CHY | Label: Yellow · Version for: Sinusoidal outputs, or specific sensors from other manufacturers |
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