The MTT MS3740 is a slim plug-in signal reverser that inverts a DC current or voltage signal, turning a direct-acting input into a reverse-acting output, for example converting a 4-20mA signal that rises with the process into a 20-4mA signal that falls instead. That makes it a simple way to fit a transmitter into a control loop that expects the opposite action, without reprogramming the controller or the transmitter itself.
It accepts a range of current and voltage inputs and provides current or voltage output options to match the receiving equipment, with a second isolated output available for feeding an independent monitoring or control system at the same time. Like the rest of the plug-in transmitter series, the MS3740 clips into its own socket base for fast swap-out during calibration or maintenance 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 (Current) | 0-20mA to 10-50mA, plus custom ranges |
| Input (Voltage) | 0-10V, ±10V, or ±5V ranges |
| Input Resistance | 250Ω (4-20mA); 1MΩ min. (voltage) |
| Max Continuous Input | 40mA (current) or 30V (voltage) |
| Output | 0-20mA to 4-20mA DC current; 10mV to 20V DC voltage; single or dual isolated output |
| Output Load | 750Ω max. (4-20mA single); 550Ω/350Ω max. (dual) |
| Adjustments | ±5% zero, front-panel trimmer |
| Accuracy | Better than ±0.1% of span (at 25°C±5°C) |
| Temperature Effect | ±0.2% of span per 10°C change |
| Response Time | 85ms max. (0-90% step response) |
| Isolation | 4-way isolation between input, output 1, output 2, and power |
| Insulation Resistance | 100MΩ min. at 500V DC |
| Power Supply | 100-240V AC (47-63Hz), 24V DC (±10%), or 100-240V DC |
| Power Consumption | 4-5VA (AC); 1.2-1.5W (24V DC); 4.8-6W (240V DC) |
| Dimensions | W29 × H86 × D125mm |
| Weight | 120g max. (main unit), plus 80g max. socket |
| Mounting | Wall or DIN rail mounting |
| Terminals | M3.5 screw terminals, 0.8-1.0 Nm torque |
| Operating Temperature | -5 to 55°C |
| Operating Humidity | 5 to 90% RH, non-condensing |
Frequently Asked Questions
What is the MTT MS3740 used for?
It’s a slim plug-in signal reverser that inverts a DC current or voltage signal, turning a direct-acting input into a reverse-acting output, for example converting a rising 4-20mA signal into a falling 20-4mA signal. It’s a simple way to fit a transmitter into a control loop that expects the opposite action, without reprogramming the controller or the transmitter itself.
What input and output signal types does it accept?
Input accepts current (0-20mA to 10-50mA, plus custom ranges) or voltage (0-10V, ±10V, or ±5V), and output can be current (0-20mA to 4-20mA DC) or voltage (10mV to 20V DC), single or dual isolated output. Tell us the input and output combination your loop needs and we can confirm.
Can I fine-tune the zero point after installation?
Yes, a front-panel trimmer gives ±5% zero adjustment, useful for matching the reversed output exactly to what the receiving instrument expects on site.
Can the MS3740 feed two circuits at the same setting?
Yes, a dual output option is available, though output load drops from 750Ω max. on a single 4-20mA output to 550Ω/350Ω max. when running dual outputs. Check your receiving instrument’s input impedance against this before specifying dual output.
How do I know if the MS3740 is right for my application?
If you have a transmitter or controller that expects the opposite signal action to what’s already installed, direct-acting versus reverse-acting, the MS3740 solves that without touching the existing instrument’s configuration. Send us the input and output signal types and we can confirm before you order.
Download MTT MS3740 Slim Plug-In Signal Reverser information here
Spec Sheet: MTT_SpecSheet1_MS3740_Rev300_E
Manual: MTT_Manual1_MS3740_Rev160_E
