The MTT MS3771 Slim Plug-In Programmable Thermocouple Temperature Transmitter converts the millivolt-level signal from a thermocouple into a standard isolated DC current or voltage output, with cold junction compensation and burnout protection built in to keep readings accurate and safe from sensor failure. Unlike a fixed-range transmitter, the MS3771 supports all of the commonly used thermocouple types — K, E, J, T, B, R, S, N, and W-series — in a single hardware platform, with the specific type and measuring range set through configuration rather than by ordering a different model.
Configuration is done from a PC over an RS-232C connection, where the thermocouple type, temperature span, output range, and burnout behavior can all be programmed to match the application, and zero and span can be fine-tuned digitally rather than with mechanical trimmers. LED status indicators show run and fault conditions at a glance, and four-way isolation between input, both outputs, and power keeps the transmitted temperature signal protected from electrical noise. This flexibility makes the MS3771 a practical choice for panel builders standardizing on one part number across many different thermocouple applications.
| Thermocouple Types | K, E, J, T, B, R, S, N, W97, W95 |
| Temperature Ranges | -200 to 2000°C (depending on type) |
| Input Resistance | 1MΩ min. |
| Allowable Input Voltage | 25V DC continuous |
| Cold Junction Compensation Error | ±0.5°C max (25°C±15°C) |
| Burnout Protection | Selectable upscale, downscale, or none (detection current approx. 25nA) |
| Output Options | Single: 4-20mA DC, 0-10V DC, 0-5V DC, 1-5V DC; Dual: various combinations (e.g., 4-20mA/1-5V DC) |
| Output Load | 750Ω max (single current); 550Ω/350Ω (dual current) |
| Adjustment | Approx. ±4% of span, zero and span, configured via RS-232C |
| Isolation | 4-way isolation between input, Output 1, Output 2, and power; 100MΩ min. insulation resistance @500V DC |
| CMRR | 100dB min. (500V AC, 50/60Hz) |
| Response Time | 260ms max (0-90%, step input) |
| Accuracy | ±0.02-0.06% input + ±0.04% output max (type-dependent) |
| Temperature Effect | 100ppm/°C max |
| Power Supply | 100-240V AC, 24V DC, or 100-240V DC; single output 5.0VA (AC) / 1.1W (24V DC) / 4.8W (DC); dual output 5.0VA (AC) / 1.5W (24V DC) / 6.0W (DC); 160mA fuse standard |
| Dimensions | W29 x H86 x D125mm (including socket and mounting screw) |
| Weight | 120g (main unit) / 80g (socket) max |
| Terminals | M3.5 screw terminals, 0.8-1.0 Nm torque |
| Mounting | Wall or DIN rail mount |
| Operating Conditions | -5 to 55°C, 5-90% RH non-condensing |
| Storage Temperature | -10 to 60°C |
| Additional Features | RS-232C PC configuration; LED status indicators (blue RUN, red FAIL); optional conformal coating and high-load current outputs |
Frequently Asked Questions
What is the MTT MS3771 used for?
It converts the millivolt-level signal from a thermocouple into a standard isolated DC current or voltage output, with cold junction compensation and burnout protection built in to keep readings accurate and safe from sensor failure. Unlike a fixed-range transmitter, the MS3771 supports all the commonly used thermocouple types in one hardware platform, with the specific type and measuring range set through configuration rather than ordered as a fixed model.
Which thermocouple types are supported?
K, E, J, T, B, R, S, N, and W-series (W97, W95), across a temperature range of -200 to 2000°C depending on the type selected. Tell us your thermocouple type and expected temperature range and we can confirm the configuration.
How is it configured for a specific thermocouple type and range?
Configuration is done via RS-232C, where the thermocouple type, temperature range, and output span are all set in software rather than by physical model selection, giving roughly ±4% of span zero and span adjustment on top of the base configuration.
What happens if the thermocouple fails or burns out?
Burnout protection is selectable: upscale, downscale, or none, with a detection current of about 25nA. This means a broken thermocouple drives the output to a defined, unmistakable state instead of leaving a misleading mid-range reading.
How do I know if the MS3771 is right for my application?
If you need a temperature transmitter that can be configured for a wide range of thermocouple types and ranges rather than ordering a separate fixed-range model for each, the MS3771 covers that in one part. Send us your thermocouple type, temperature range, and desired output signal, and we can confirm the configuration before you order.
Download MTT MS3771 Slim Plug-In Programmable Thermocouple Temperature Transmitter information here
Spec Sheet: MTT_SpecSheet1_MS3771_Rev250_E
Manual: MTT_Manual1_MS3771_Rev140_E
