The MTT MS3718 is a slim plug-in frequency-to-analog converter built for ultra-low-frequency signals, reading pulse rates down to as little as 0.01Hz where a standard frequency converter would struggle to track the signal at all. That makes it well suited to slow processes such as low-flow metering or paddle-wheel sensors turning only a few times a minute, converting the sparse pulse train into a steady, usable DC output.
It accepts current or voltage output configurations, with a second isolated output available for feeding an independent monitoring or control system. Like the rest of the plug-in transmitter series, the MS3718 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 Frequency | 0-0.01Hz to 0-20Hz |
| Output | 0-20mA or 4-20mA DC current; 10mV to 20V DC voltage; single or dual isolated output |
| Isolation | 4-way isolation between input, output 1, output 2, and power |
| Dielectric Strength | 2000V AC for 1 minute |
| Power Supply | 100-240V AC, 24V DC (±10%), or 100-240V DC |
| Power Consumption | 9.0VA/W max. |
| Accuracy | Better than ±0.15% of span (at 25°C) |
| Response Time | 2 pulses + 0.2s (start), then 1 pulse + 0.2s |
| Temperature Effect | Better than ±0.2% of span per 10°C change |
| 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 MS3718 used for?
It’s a frequency-to-analog converter built for very slow pulse signals, reading input frequencies down to 0.01Hz where a standard converter would struggle. It’s a good fit for slow-turning paddle-wheel sensors or low-flow metering applications, converting a sparse pulse train into a steady DC output.
What’s the difference between the MS3718 and a standard frequency-to-analog converter like the MS3708?
The MS3718 is built specifically for the ultra-low end of the frequency range (0.01Hz to 20Hz), while the MS3708 covers a much wider general-purpose range starting from around 15Hz upward. If your pulse source turns only a few times a minute, the MS3718 is the right choice.
What input pulse types does the MS3718 accept?
Tell us your sensor type (dry contact, open collector, or voltage pulse) and pulse rate, and we can confirm it matches the MS3718’s input range before you order.
Can the MS3718 provide two separate outputs?
Yes — a second isolated output is available, so the converted signal can feed a controller and a separate monitoring or logging system at the same time.
How do I know if I need the MS3718 instead of a standard converter?
If your pulse source produces fewer than roughly one pulse per second, the MS3718’s ultra-low-frequency range is built for that. Send us your sensor’s pulse rate and we can confirm.
Download MTT MS3718 Slim Plug-In Frequency/Analog Converter (for Ultra Low Frequency) information here
Spec Sheet: SpecSheet1_MS3718_Rev120_E.pdf
Manual: Manual1_MS3718_Rev110_E.pdf
