The MTT MS3102 is a terminal block type RTD temperature transmitter with two independent, isolated outputs. It accepts Pt100Ω (-200 to +850°C), JPt100Ω (-200 to +500°C), Pt50Ω, (-200 to +600°C), or Ni508.4Ω inputs, with excitation current of approximately 1mA and lead wire resistance up to 200Ω max per wire.
Output 1 and output 2 are independently configurable to current (0~20mA, 4~20mA) or voltage (10mV-20V range) – 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 via front-accessible trimmers, and burnout protection drives the output upscale if the sensor wire opens.
Accuracy is better than ±(0.15% of span + 0.1°C) at 25°C±5°C, with temperature effect better than ±0.2% of span per 10°C change and response time of 170ms max (0 to 90%). CMRR is 100dB min (500V AC, 50/60Hz).
There is 4-way isolation between input, output 1, output 2, and power, with dielectric strength of 2000V AC for 1 minute and insulation resistance of 100MΩ min at 500V DC. Power supply is flexible: 100-240V AC, 24V DC, 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 and weighing under 140g.
| Input Types | Pt 100Ω, JPt 100Ω, Pt 50Ω, Ni 508.4Ω |
| Temperature Ranges | Pt 100Ω: -200 to +850°C; JPt 100Ω: -200 to +500°C; Pt 50Ω: -200 to +600°C |
| Excitation Current | Approx. 1mA |
| Lead Wire Resistance | 200Ω max. per wire |
| Output 1 & 2 | Current (0-20mA, 4-20mA) or voltage (10mV-20V range), independently configurable |
| Zero / Span Adjustment | Approx. ±5% of span, front-accessible trimmers |
| Burnout Protection | Upscale on open sensor wire |
| Accuracy | Better than ±(0.15% of span + 0.1°C) at 25°C±5°C |
| Response Time | 170ms max. (0 to 90%) |
| Temperature Effect | Better than ±0.2% of span per 10°C change |
| CMRR | 100dB min. (500V AC, 50/60Hz) |
| Power Supply | 100-240V AC, 24V DC, or 110V DC |
| Power Consumption | 7.0VA (AC), 1.8W (24V DC), 2.5W (110V DC) |
| Isolation | 4-way isolation between input, output 1, output 2, and power |
| Insulation Resistance | 100MΩ min. (@ 500V DC) |
| Dielectric Strength | 2000V AC for 1 minute |
| 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 MS3102 used for?
It converts a Pt or Ni RTD signal into two fully independent, isolated DC outputs, so a control loop and a separate alarm or monitoring system can both read the same measurement without interacting.
Can the MS3102 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 MS3102 and the MS3002?
The MS3002 has a single isolated output and runs on 24V or 12V DC only. The MS3102 adds a second, independently isolated output and accepts AC or DC power, so use the MS3102 when you need to feed two separate systems from one RTD or only have AC power available.
Does the MS3102 compensate for lead wire resistance?
Yes, lead-wire compensation is built in, which keeps the reading accurate even over longer RTD cable runs.
Download MTT MS3102 Terminal Block Type RTD Temperature Transmitter information here
Datasheet: MTT MS3102 Spec Sheet (PDF)
Manual: MTT MS3102 User’s Manual (PDF)
