The MTT MS3708 is a slim plug-in frequency-to-analog converter that turns a pulse train from a flow meter, tachometer, or similar sensor into a proportional DC signal, delivered as one or two isolated outputs. It accepts a wide range of pulse sources, including dry contacts, open-collector outputs, AC or DC voltage pulses, and 4-20mA pulse signals, so it can be matched to whatever sensor is already installed without extra interposing hardware.
Where a dual-output configuration is used, both outputs stay isolated from each other, the input, and the power supply, letting one pulse source 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 MS3708 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 | Dry contact, open collector, AC/DC voltage pulse, or 4-20mA DC pulse |
| Frequency Range | 0-15Hz to 0-100kHz (selectable) |
| Input Voltage | Up to 200Vp-p AC or 30V DC max. |
| Minimum Pulse Width | 4 microseconds |
| Output | 4-20mA DC, 0-20mA DC, or 10mV to 20V DC (single or isolated dual output) |
| Output Load | Up to 750Ω for a single output; 550Ω (Output 1) / 350Ω (Output 2) for dual outputs |
| Isolation | Full isolation between input, outputs, power, and ground |
| Power Supply | 100-240V AC, 24V DC, or 100-240V DC (single output: 8.3VA/2.6W max; dual output: 9.0VA/3.0W max) |
| Accuracy | Better than ±0.3% of span |
| Temperature Effect | ±0.2% of span per 10°C change |
| CMRR | Minimum 100dB |
| Housing | ABS/PBT/PC resins with conformal coating |
| 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 MS3708 used for?
It converts a pulse or frequency signal, such as from a flow meter or tachometer, into a proportional DC current or voltage output that standard control and monitoring equipment can read.
What kinds of pulse sources can the MS3708 accept?
Dry contacts, open-collector outputs, AC or DC voltage pulses, and 4-20mA pulse signals, across a selectable frequency range from 0-15Hz up to 0-100kHz.
Can the MS3708 drive two separate systems from one pulse source?
Yes, in its dual-output configuration — both outputs are isolated from each other, the input, and the power supply, so one pulse source can feed a control loop and a separate monitoring or logging system at the same time.
What output signal ranges does the MS3708 support?
4-20mA DC, 0-20mA DC, or a DC voltage range from 10mV to 20V, selectable to match your receiving equipment.
How do I know if the MS3708 is right for my sensor?
Send us your sensor’s pulse output type (contact, open collector, voltage, or current pulse) and its frequency range, plus the output signal your receiving equipment needs, and we’ll confirm the right configuration.
Download MTT MS3708 Slim Plug-In Frequency to Analog Converter information here
Spec Sheet: MTT MS3708 Spec Sheet
Manual: MTT MS3708 Manual
