The MTT MS3728 is a slim plug-in tacho-generator transmitter that reads the AC voltage output of a tachometer generator and converts it into a standard, isolated DC signal for speed monitoring and control systems. Since a tacho-generator produces a voltage that rises with shaft speed, the MS3728 turns that raw AC signal into a clean process value that displays, controllers, and overspeed protection systems can use directly.
A wide range of input voltage spans and frequencies are supported to match different generator types, and current or voltage output options let it fit the receiving equipment, with a second isolated output for feeding an independent monitoring or alarm system at the same time. Like the rest of the plug-in transmitter series, the MS3728 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 Voltage | 0-50mV AC to 0-300V AC, selectable |
| Input Frequency | 15Hz to 1kHz (at 100% input) |
| Input Resistance | 100kΩ min. (span ≤500mV); 1MΩ min. (span >500mV) |
| Output | 0-20mA or 4-20mA DC current; 10mV to ±10V DC voltage; single or dual isolated output |
| Accuracy | Better than ±0.4% of span (10%+ input) |
| Temperature Effect | ±0.2% of span per 10°C change |
| Response Time | 450ms max. (0-90%, step input at 100%) |
| Isolation | 4-way isolation between input, output 1, output 2, and power |
| Power Supply | 100-240V AC, 24V DC, or 100-240V DC |
| Power Consumption | 4.5-5.0VA max. (AC); 1.2-1.6W max. (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 MS3728 used for?
It reads the AC voltage output of a tacho-generator and converts it into a standard, isolated DC signal for speed monitoring, control loops, or overspeed protection. Since a tacho-generator’s output voltage rises with shaft speed, the MS3728 turns that raw signal into a usable process value.
What input voltage and frequency range does the MS3728 support?
Input voltage spans from 0-50mV AC up to 0-300V AC are selectable, covering frequencies from 15Hz to 1kHz at full input. Tell us your tacho-generator’s output voltage and frequency at rated speed and we can confirm the right input range.
Can the MS3728 be used for overspeed protection?
Yes — its output can feed an overspeed trip or alarm system, and a second isolated output is available so the speed signal can feed a controller and a separate protection system at the same time.
Does the MS3728 work with any tacho-generator?
It’s built to match a wide range of tacho-generator output voltages and frequencies, but the exact match depends on your generator’s characteristics. Send us your generator’s rated output voltage and frequency at operating speed and we can confirm.
How do I know if the MS3728 is the right model for my application?
Send us your tacho-generator’s output voltage and frequency range plus the output signal your control system expects, and we can confirm before you order.
Download MTT MS3728 Slim Plug-In Tacho-Generator Transmitter information here
Spec Sheet: SpecSheet1_MS3728_Rev270_E.pdf
Manual: Manual1_MS3728_Rev140_E.pdf
