1. General Overview:

️· Product: M2RT Temperature Transmitter
️· Function: Converts temperature signals into standard output signals (voltage).
️· Applications: General temperature monitoring and control.
️· Manufacturer: M-System
️· Website: http://www.m-system.co.jp/

2. Key Specifications (General - applies to most models):

️· Input: Various temperature sensors (Pt, Ni 508.4 Ω, Copper Wire - "Cu Input")
️· Output: DC Voltage (-10 to +12V DC)
️· Accuracy: ±0.2%
️· Temperature Coefficient: ±0.015%/°C
️· Burnout Response: ≤ 10 seconds
️· Line Voltage Effect: ±0.1% over voltage range
️· Insulation: Input to output to power
️· Certifications: RoHS Directive, CE marking (optional).
️· Mounting: DIN Rail or Surface
️· Operating Environment: -20 to +80°C

3. "Cu Input" Specifics (Copper Wire Input):

This section describes the parameters and calculations specific to when using a copper wire sensor as the input.

️· Sensing Current Options:
- 1 mA for spans between 140 Ω and 300 Ω
- 2 mA for spans between 12 Ω and 140 Ω
- 3 mA for spans between 8 Ω and 12 Ω
- 5 mA for spans between 3.5 Ω and 8 Ω
️· Usable Range: 3.5 Ω ≤ Span ≤ 300Ω
️· Lead Wire Resistance: Maximum 200 Ω per wire. The equation to calculate the allowable lead wire resistance is:
- `Leadwire resistance(Ω) = (2500 - 100% resistance(Ω) × Sensing current(mA)) ÷ (3 × Sensing current(mA))`
️· Accuracy Calculation: Uses the equation below to calculate the accuracy in percentage
* `Accuracy(%) = 0.02(Ω) ÷ Resistance span(Ω) × 100 + 0.1(%) × 40(mV) ÷ (Resistance span(Ω) × Sensing current(mA))`
️· Temperature Coefficient Calculation: Uses the equation below to calculate the temperature coefficient in percentage
- `Temperature coefficient(%/°C) = 0.015(%/°C) × 40(mV) ÷ (Resistance span(Ω) × Sensing current(mA))`

4. Options & Customization:

️· Response Time: Standard (≤ 0.5 sec) or Fast (approx. 35msec)
️· Burnout Mode: Upscale or Downscale.
️· Coating: Silicone, Polyurethane, or Rubber (for environmental protection)
️· Screw Material: Standard Chromated Steel or Stainless Steel.
️· Adjustment: Zero adjustment (-5 to +5%) and Span adjustment (95 to 105%) are possible.
️· Linearization: Standard, but not available for Cu Input.

5. Diagrams/Schematics:

️· The document includes a schematic diagram showing the internal components related to the output circuitry.
️· It shows connections for a Reference Resistor.
️· There are multiple diagrams illustrating the physical layout and dimensions of the unit including DIN rail and screw terminals.

In essence, the "Cu Input" section provides the specific details needed to use the M2RT transmitter with copper wire temperature sensors, including the critical calculations and limitations to ensure accurate temperature measurement.