The MTT MS3729 is a slim plug-in analog-to-frequency converter that turns a DC current or voltage signal into a pulse train, the reverse of a typical frequency-to-analog transmitter. That makes it useful wherever a downstream counter, PLC pulse input, or totalizer needs a frequency signal but the only measurement available is a standard 4-20mA or voltage reading, letting the two kinds of equipment talk to each other without a separate interface.
Output frequency can be scaled from a very slow trickle up to 5kHz, with a choice of TTL, open collector, or photo MOS relay output types and a second isolated output available for feeding an independent system at the same time. Like the rest of the plug-in transmitter series, the MS3729 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, 1-5mA, 2-10mA, 4-20mA, or 10-50mA |
| Input (Voltage) | 0-1V to 1-5V ranges |
| Input Resistance | 10Ω to 1MΩ, depending on signal type |
| Output Frequency | 0-0.001Hz to 0-5kHz (photo MOS relay limited to 30Hz) |
| Output Type | TTL level, open collector, or photo MOS relay; single or dual output |
| Accuracy | Better than ±0.1% of span (at 25°C±5°C) |
| Response Time | 3.1s at 0.5Hz; 35ms max. at 500Hz |
| Temperature Effect | ±0.2% of span per 10°C change |
| 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 | 3.5-4.8VA/W depending on configuration |
| Dimensions | W29 × H86 × D125mm |
| Weight | 120g max. (main unit), plus 80g max. socket |
| Mounting | Wall or DIN rail mounting |
| Terminals | M3.5 screw terminals |
| Operating Temperature | -5 to 55°C |
| Operating Humidity | 5 to 90% RH, non-condensing |
Frequently Asked Questions
What is the MTT MS3729 used for?
It converts a DC current or voltage signal into a pulse train — the reverse of a typical frequency-to-analog transmitter. It’s useful when a downstream counter, PLC pulse input, or totalizer needs a frequency signal but your only measurement is a standard 4-20mA or voltage reading.
What output frequency range does the MS3729 support?
Output frequency can be scaled from as low as 0.001Hz up to 5kHz (30Hz max. with the photo MOS relay output type). Tell us the frequency range your receiving equipment needs and we can confirm the right scaling.
What output types are available?
TTL level, open collector, or photo MOS relay outputs are available, with a second isolated output for feeding an independent system at the same time.
What’s the difference between the MS3729 and the MS3708/MS3718 frequency-to-analog converters?
The MS3708 and MS3718 go the other way — they convert a pulse/frequency signal into a standard analog output. The MS3729 does the opposite: it converts an analog signal into a pulse output. Use the MS3729 when your source is analog but your receiving equipment needs pulses.
How do I know if the MS3729 is right for my application?
Send us your analog input signal range and the frequency and output type your receiving equipment expects, and we can confirm before you order.
Download MTT MS3729 Slim Plug-In Analog/Frequency Converter information here
Spec Sheet: SpecSheet1_MS3729_Rev250_E.pdf
Manual: Manual1_MS3729_Rev140_E.pdf
