The MTT MS3706B is a slim plug-in strain gauge transmitter tuned for low-output bridge sensors, resolving spans as narrow as under 1mV where a standard strain gauge transmitter would need a much larger signal to work with. It powers a strain gauge, load cell, or pressure sensor bridge directly, reads the low-level millivolt signal, and converts it into one or two isolated DC outputs suitable for standard control and monitoring equipment.
Where a dual-output configuration is used, both outputs stay isolated from each other, the input, and the power supply, letting one bridge sensor feed a control loop and an independent monitoring or logging system at the same time. Like the rest of the plug-in transmitter range, the MS3706B clips into its own socket base so the unit can be swapped for calibration or replacement in seconds without disturbing the field wiring, and flexible AC or DC power plus wall or DIN rail mounting make it easy to fit into an existing panel.
| Input Types | Strain gauge, load cell, or pressure sensor bridge |
| Input Range | -5mV to +5mV DC |
| Input Span | 0.8mV to 10mV (1.6mV to 10mV for ranges including negative signals) |
| Bridge Excitation | 5V DC (120Ω bridge) or 10V DC (350Ω bridge) |
| Input Resistance | 1MΩ minimum (with power) |
| Output | 0-20mA DC, 4-20mA DC, or 10mV to 20V DC (single or isolated dual output) |
| Output Load | Up to 750Ω for a single 4-20mA output; 550Ω/350Ω for dual outputs |
| Isolation | 4-way isolation between input, output, power, and ground |
| Power Supply | 100-240V AC, 24V DC ±10%, or 100-240V DC |
| Accuracy | Better than ±0.5% of span (at 25°C±5°C) |
| Temperature Effect | Better than ±1.0% of span per 10°C change |
| Response Time | 85ms maximum (0-90%) |
| CMRR | Minimum 100dB |
| Dielectric Strength | 2000V AC for one minute |
| Dimensions (W x H x D) | 29mm x 86mm x 125mm |
| Weight | Main unit 120g; socket 80g |
| Mounting | Wall or DIN rail mounting, plug-in socket base |
| Operating Temperature | -5 to 55°C ambient |
Frequently Asked Questions
What is the MTT MS3706B used for?
It powers and reads a strain gauge, load cell, or pressure sensor bridge with a very low output signal, and converts it into a standard DC current or voltage output that a PLC, indicator, or recorder can use directly.
What’s the difference between the MS3706B and the standard MS3706?
The MS3706B is tuned for low-output bridge sensors, accepting spans as narrow as under 1mV, where the standard MS3706 needs a larger input span (down to 5mV). The trade-off is a wider accuracy tolerance on the MS3706B (±0.5% of span vs the standard’s ±0.1%).
Does the MS3706B supply power to the sensor bridge?
Yes — it provides built-in bridge excitation (5V DC for a 120Ω bridge or 10V DC for a 350Ω bridge), so no separate excitation supply is needed for the sensor.
Can the MS3706B drive two separate systems from one sensor?
Yes, in its dual-output configuration — both outputs are isolated from each other, the input, and the power supply, so one bridge sensor can feed a control loop and a separate monitoring or logging system at the same time.
How do I know if I need the MS3706B instead of the standard MS3706?
Send us your sensor’s rated output (mV/V) and bridge resistance. If your bridge signal span is under about 5mV, the MS3706B is the right choice; for larger spans the standard MS3706 gives tighter accuracy.
Download MTT MS3706B Slim Plug-In Strain Gauge Transmitter information here
Spec Sheet: MTT MS3706B Spec Sheet
Manual: MTT MS3706/MS3706B Manual
