The MTT MS3101 is a terminal block type thermocouple temperature transmitter with two independent, isolated outputs. It accepts all 8 standard thermocouple types – K, E, J, T, B, R, S, and N – with 1MΩ min input resistance, cold junction compensation error of ±0.5°C max (25°C±15°C), and a maximum continuous input of 30V DC.
Output 1 and output 2 are independently configurable to current (0~20mA, 4~20mA) or voltage (±1V to ±10V DC) – useful when one signal needs to feed a PLC and a second, separate signal needs to feed a recorder or indicator at the same time. Zero and span are each adjustable by about ±5% of span. If the thermocouple fails open, burnout protection drives the output upscale as standard (downscale optional) instead of leaving it to float.
Accuracy is better than ±(0.1% of span + 0.5°C + linearity error) at 25°C±5°C, with temperature effect better than ±0.2% of span per 10°C change and response time of 160ms max (0 to 90%). CMRR is 100dB min (500V AC, 50/60Hz).
There is 5-way isolation between input, output 1, output 2, power, and ground, with dielectric strength of 2000V AC (input/outputs), 500V AC (output1/output2), and 2000V AC (power/ground), and insulation resistance of 100MΩ min at 500V DC. Power supply is flexible: 100-240V AC, 24V DC (±10%), or 110V DC, drawing 7.0VA (AC), 1.8W (24V DC), or 2.5W (110V DC). The unit mounts on DIN rail with M3.5 screw terminals, measuring W49.8 × H102.0 × D40.0mm.
| Input Types | Thermocouple K, E, J, T, B, R, S, N |
| Input Resistance | 1MΩ min. |
| Cold Junction Compensation Error | ±0.5°C max. (25°C±15°C) |
| Allowable Input Voltage | 30V DC max., continuous |
| Output 1 & 2 | Current (0-20mA, 4-20mA) or voltage (±1V to ±10V DC), independently configurable |
| Zero / Span Adjustment | Approx. ±5% of span |
| Burnout Protection | Upscale standard (downscale optional) |
| Accuracy | Better than ±(0.1% of span + 0.5°C + linearity error) at 25°C±5°C |
| Response Time | 160ms max. (0 to 90%) |
| CMRR | 100dB min. (500V AC, 50/60Hz) |
| Temperature Effect | Better than ±0.2% of span per 10°C change |
| Power Supply | 100-240V AC, 24V DC (±10%), or 110V DC |
| Power Consumption | 7.0VA (AC), 1.8W (24V DC), 2.5W (110V DC) |
| Isolation | 5-way isolation between input, output 1, output 2, power, and ground |
| Insulation Resistance | 100MΩ min. (@ 500V DC) |
| Dielectric Strength | Input/outputs 2000V AC; output1/output2 500V AC; power/ground 2000V AC |
| Enclosure / Mounting | ABS resin (UL 94V-0), DIN rail mounting, M3.5 screw terminal |
| Dimensions | W49.8 × H102.0 × D40.0 mm |
| Weight | 140g max. |
| Operating Temperature | -5 to 55°C, 5-90% RH non-condensing |
| Storage Temperature | -10 to 60°C |
Frequently asked questions
What is the MS3101 used for?
It converts a thermocouple signal into two fully independent, isolated DC outputs, so you can feed a PLC and a separate recorder or alarm module from the same measurement point.
Can the MS3101 be used with AC power instead of 24V DC?
Yes, it accepts 100 to 240V AC, 24V DC, or 110V DC, so it fits panels that don’t have a clean 24V DC bus available.
What’s the difference between the MS3101 and the MS3001?
The MS3001 has a single isolated output and runs on 24V or 12V DC only. The MS3101 adds a second, independently isolated output and accepts AC or DC power, so use the MS3101 when you need to feed two separate devices or only have AC power available.
Does the MS3101 need burnout protection settings?
It comes with upscale burnout protection as standard, with a downscale option available, so the output moves to a known state if the thermocouple fails.
Download MTT MS3101 Terminal Block Type Thermocouple Temperature Transmitter information here
Datasheet: MTT MS3101 Spec Sheet (PDF)
Manual: MTT MS3101 User’s Manual (PDF)
