Monarch ACT-3X Tachometer / Totalizer

1/8 DIN programmable tachometer, totalizer, and ratemeter with 5…999,990 RPM range, universal sensor inputs, NIST Traceable Certificate included, and optional analog, alarm, and communications.

Key advantages

5…999,990 RPM — input frequency 0.083 Hz…250 kHz; totalizer to 99,999 (×10 display above).
NIST included — no extra certificate charge on ACT-3X.
Front-panel or PM Remote setup — pushbuttons or free PM Remote Software; real-time PC/.CSV data with USB cable or comms option.
Rich options — 4–20 mA / 0–5 V; alarm relays; RS-232 / USB / Ethernet; standard pulse repeater.

Typical applications

Panel RPM, rate, and totalizing with Monarch “-W” sensors.
Dual-input event/linear-rate capture using Channel 2.
Machines needing scalable analog out and high/low alarms.

Selection guide

Speed / accuracy — 5…999,990 RPM; ±0.001% of reading or ±1 displayed resolution (standard gate); ±0.01% (fast gate).
Inputs — Universal optical/IR/laser/proximity/magnetic; TTL; ~1.1 V…50 Vac; 1…9,999 PPR programmable.
Power — 100–240 Vac 50/60 Hz standard; optional 12 or 24 Vdc.
Outputs — Standard TTL pulse repeater; optional 4–20 mA or 0–5 V; optional alarm relays.
Comms — Optional RS-232, USB, Ethernet; USB programming cable if no comms option.
Display — 5-digit LED; 1/8 DIN panel.

Common mistakes

Ordering ACT-1B when totalizer/alarms/Ethernet of ACT-3X are required.
Forgetting to specify AC vs DC power and analog/alarm/comms options.
Mismatching sensor excitation to the configured supply.
Test & measurement

When to RFQ / what to tell us

Power (AC / 12 Vdc / 24 Vdc).
Analog, alarm, and communications options; full-scale RPM if analog.
Sensor type / PPR; quantity; ship-to.

Request a Quote · Get selection help

Specs

Spec	Value
SKU	32128
Brand	Monarch Instrument
Model	ACT-3X
Product type	panel tachometer / totalizer / ratemeter
Measuring range	5 to 999,990 RPM; input 0.083 Hz to 250 kHz
Accuracy	±0.001% of reading or ±1 displayed resolution (standard gate)
Output signal	Standard TTL pulse repeater; optional 4–20 mA / 0–5 V; optional alarms
Supply voltage	100–240 Vac 50/60 Hz; optional 12 or 24 Vdc
Notes	NIST Traceable Certificate included. Specs from monarchinstrument.com ACT-3X page.

Documents

ACT-3X product page (OEM)

FAQ

Q: ACT-3X vs ACT-1B? A: ACT-3X adds totalizer/ratemeter features, front-panel programming, NIST included, and broader alarm/comms options.

Q: What should I send for a quote? A: Power, I/O/comms options, sensor/PPR, quantity, ship-to. Compatible with systems using Monarch ACT-3X if you need a drop-in check — we do not claim authorized-dealer status.