The MTT MS3901 Thermocouple Signal Conditioner is a compact, chassis-mounting transmitter that converts a thermocouple’s millivolt-level signal into a standard isolated DC output, with cold junction compensation, built-in linearization, and selectable burnout protection handled on board. Unlike MTT’s slim plug-in DIN rail modules, the MS3901 is designed to mount directly onto its RC3900 mounting base for high-density installations where many channels need to be packed into a compact chassis.
The transmitter accepts the full range of JIS-standard thermocouple types and can be specified for the exact temperature span the application requires, with a built-in six-segment linearizer correcting for the sensor’s non-linear characteristic. Two independently configurable outputs are available in various current and voltage combinations, front-accessible trimmers allow zero and span adjustment, and dual-output isolation keeps each channel electrically independent. Anti-humidity PCB coating and self-popup wiring screws on the chassis base make the MS3901 straightforward to install and maintain in dense panel layouts.
| Thermocouple Types | JIS standard: K, E, J, T, B, R, S, N, or custom |
| Signal Span | User-specified temperature range (minimum 3mV equivalent) |
| Input Resistance | 1MΩ min. |
| Allowable Lead Wire Resistance | 1kΩ max |
| Max Input Voltage | 30V DC continuous |
| Cold Junction Compensation Error | ±0.3°C max |
| Linearizer | Built-in, up to 6 segments |
| Output Options | Dual outputs, combinations of 1-5V DC, 0-5V DC, 0-10V DC, ±5V DC, ±10V DC, or 4-20mA DC |
| Output Load | 2mA max (voltage); 300Ω max (current) |
| Adjustment | Approx. ±2% of span, zero and span, via front trimmers |
| Burnout Protection | Selectable upward or downward |
| Accuracy | ±(0.1% F.S. + 0.3°C + linearization error) at 25°C±5°C; ±0.2% of span per 10°C temperature effect |
| Response Time | 160ms max (0-90%); adjustable response frequency up to 200Hz and time down to 2ms via options |
| CMRR | 100dB min. (500V AC, 50/60Hz) |
| Isolation | 100MΩ min. insulation resistance across all ports; 1500V AC dielectric strength (1 min) input-to-others, 500V AC (1 min) output-to-output |
| Power Supply | 24V DC ±10%, 50mA max; 300mA fuse standard |
| Dimensions | W19.5 x H53 x D84mm |
| Weight | Approx. 70g |
| Mounting | Chassis mount on RC3900-series mounting base |
| Operating Conditions | 0-55°C, 90% RH max non-condensing |
| Storage Temperature | -10 to 60°C |
| Additional Features | Anti-humidity PCB coating; self pop-up wiring screws on chassis base |
Frequently Asked Questions
What is the MTT MS3901 used for?
It converts a thermocouple’s millivolt-level signal into a standard isolated DC output, with cold junction compensation, built-in linearization, and selectable burnout protection handled on board. It is a chassis-mount module, designed to sit on an RC3900 mounting base rather than a DIN-rail slim plug-in housing.
Which thermocouple types are supported?
JIS-standard K, E, J, T, B, R, S, N, or a custom type, over a user-specified temperature span (minimum 3mV equivalent). Tell us your thermocouple type and temperature range and we can confirm the configuration.
How does the linearizer work?
A built-in linearizer, up to 6 segments, corrects for the thermocouple’s non-linear millivolt-to-temperature characteristic, so the output tracks actual temperature accurately across the specified span rather than relying on simple straight-line scaling.
Why chassis-mount instead of a DIN-rail module?
The MS3901 mounts directly onto an RC3900 mounting chassis, which is the right choice when many measurement channels need to be packed into a compact panel space, rather than installing individual DIN-rail housings for each channel.
How do I know if the MS3901 is right for my application?
If you’re measuring with a thermocouple and need a high-density, chassis-mounted transmitter for a multi-channel panel, the MS3901 on an RC3900 base covers that. Send us your thermocouple type, temperature range, and output signal requirement and we’ll confirm before you order.
Download MTT MS3901 Thermocouple Signal Conditioner (Chassis Mount, Isolated) information here
Datasheet: MTT_MS3901_Datasheet
