The MTT MS3702-01 is a slim plug-in 4-wire RTD temperature transmitter, mounted on a plug-in base socket for quick swap-out without rewiring. The 4-wire connection removes the error that lead wire resistance would otherwise add, so it is the right choice when cable runs are long or extra accuracy matters. It accepts 4-wire Pt100Ω, JPt100Ω (standard), Pt50Ω (quasi-standard), or custom RTD types, covering -200 to +850°C (Pt100Ω) or -200 to +500°C (JPt100Ω), with lead wire resistance tolerated up to 50Ω max per wire and excitation current of approximately 1mA for Pt type at 0-100°C.
Output is 0~20mA DC, 4~20mA DC, ±1V to ±10V, or 0~10mV to 0~10V DC, available as a single output or an isolated dual output, with output load up to 750Ω for a single 4~20mA output, or 550Ω (output 1) and 350Ω (output 2) when both are used. Zero and span are adjustable by ±5% of span via front-accessible trimmers, with 4-way isolation between input, outputs, power, and ground. If the sensor wire opens, burnout protection drives the output upscale as standard on all configurations.
Accuracy is better than ±0.2% of span (at 25°C±5°C), with temperature effect better than ±0.2% of span per 10°C ambient change and response time of 170ms max (0-90%); an optional fast-response 10ms version is also available. CMRR is 100dB minimum (500V AC, 50/60Hz), with insulation resistance of 100MΩ minimum at 500V DC and dielectric strength of 2000V AC for one minute.
The unit mounts on wall or DIN rail via a plug-in socket base. Power supply is flexible: 100-240V AC (50/60Hz), 24V DC ±10%, or 100-240V DC (approximately 5.5-7.0VA AC, 1.6-1.8W or 6.0W DC).
| Input Types | 4-wire Pt 100Ω, JPt 100Ω (standard), Pt 50Ω (quasi-standard), or custom |
| Temperature Range | -200 to +850°C (Pt 100Ω); -200 to +500°C (JPt 100Ω) |
| Lead Wire Resistance | 50Ω maximum per wire |
| Excitation Current | Approximately 1mA for Pt type at 0-100°C |
| Output | 0-20mA DC, 4-20mA DC, ±1V to ±10V, or 0-10mV to 0-10V DC (single or isolated dual output) |
| Output Load (Current) | Single 4-20mA: max 750Ω; dual outputs: max 550Ω (Output 1), 350Ω (Output 2) |
| Zero & Span Adjustment | ±5% of span via front-accessible trimmers |
| Isolation | 4-way isolation between input, outputs, power, and ground |
| Power Supply | 100-240V AC (50/60Hz), 24V DC ±10%, or 100-240V DC (approx. 5.5-7.0VA AC, 1.6-1.8W or 6.0W DC) |
| Accuracy | Better than ±0.2% of span (at 25°C±5°C) |
| Temperature Effect | Better than ±0.2% of span per 10°C ambient change |
| Response Time | 170ms maximum (0-90%); optional fast-response 10ms available |
| CMRR | Minimum 100dB (500V AC, 50/60Hz) |
| Insulation Resistance | 100MΩ minimum at 500V DC |
| Dielectric Strength | 2000V AC for one minute |
| Sensor Burnout Protection | Upscale, standard on all configurations |
| Dimensions (W x H x D) | 29mm x 86mm x 125mm |
| Weight | Main unit up to 120g; socket up to 80g |
| Mounting | Wall or DIN rail mounting, plug-in socket base |
| Terminals | M3.5 screw terminals with cover and anti-dropout screws; gold-plated contacts |
| Operating Temperature | -5 to 55°C ambient (storage: -10 to 60°C) |
| Operating Humidity | 5-90% RH, non-condensing |
Frequently Asked Questions
What is the MTT MS3702-01 used for?
It converts a 4-wire RTD temperature signal into a standard 4-20mA, 0-20mA, or DC voltage output for a PLC, DCS, or panel meter, with lead wire resistance error eliminated by the 4-wire connection.
Can the MS3702-01 be used with 2-wire or 3-wire RTDs?
It’s built specifically for 4-wire RTD sensors. If your sensor is wired 2-wire or 3-wire, the standard MS3702 is the correct model instead — using the MS3702-01 without a true 4-wire connection won’t give you the accuracy benefit it’s designed for.
What’s the difference between the MS3702-01 and the standard MS3702?
The MS3702 accepts standard 2 or 3-wire RTD connections and tolerates up to 200Ω lead wire resistance per wire. The MS3702-01 is built for 4-wire RTD connections, which removes lead wire resistance error entirely — useful on long cable runs or where the highest accuracy is needed.
What’s the difference between the MS3702-01 and the MS3702B?
These are different variants in the MS3702 family. If you’re replacing an existing unit, check the model code on the old unit’s label, or send us your RTD wiring type and output requirements and we’ll confirm the right one.
How do I know which MS3702 model I need?
Start with how your RTD is actually wired at site (2, 3, or 4-wire), then confirm the output signal your PLC or DCS expects. Send us these details and we can confirm the right model before you order.
Download MTT MS3702-01 Slim Plug-In 4-Wire RTD Temperature Transmitter information here
Spec Sheet: MTT MS3702-01 Spec Sheet
Manual: MTT MS3702-01 Manual
