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ACT-1B Panel Tachometer


Regular price $325.00 Sale

Due to supply chain issues, product delivery may be delayed. Contact factory for details.

The ACT-1B Panel Tachometer with a speed range of 5-99,999 RPM.



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Extended Warranties are Available


The ACT-1B Panel Tachometer is compatible with all Monarch speed sensors with tinned wire "-W" connections. It can be factory configured to meet your specifications or user-configured onsite with the optional USB Programming Cable. The USB Programming Cable and free downloadable PM Remote Software also allow real-time display and recording of data on a local PC. Optional NIST Traceable Certificate is available.

For assistance in choosing power and output options, contact Monarch Instrument.


All models - universal input, non-contact operation from optical, infrared, laser, proximity, and magnetic sensors or direct TTL and 3.3 to 50 V ac signals

ACT-1B Panel Tachometer

  • Economically priced
  • 1/8 DIN sized
  • 5-digit LED display
  • 5 to 99,999 RPM range
  • Universal sensor inputs
  • Compatible with most speed sensors
  • User-configurable*
  • View real-time data on PC*
  • Store data in Excel File in real-time*
  • Universal AC power 100-240 V ac, 50/60 Hz or optional dc input power
  • Optional 4-20 mA or 0-5 V dc scalable output

*Requires optional USB programming cable and free downloadable PM Remote Software.



Speed Range 5 to 99,999 RPM
Accuracy ±1 RPM or 0.005% of reading
Resolution 1 RPM (user-programmable to 0.0001†)
Display 5-digit, 0.56 in. [14 mm] high red LED
Display Update Twice per second above 120 RPM  (user-programmable to 0.5, 1 or 1.5 second†)
Dimensions 1/8 DIN by 4.5 in. [114 mm] deep Panel cutout: 3.58" x 1.74" [91 x 44 mm]
Power Supply Standard: 100-240 V ac ±10%, 50/60 Hz,
Optional: 12 or 24 V dc ±10%, Isolated, 5.0 Watts
Inputs Universal input for optical, proximity, two-wire, or three-wire magnetic, infrared, or laser sensors

TTL input or 2 V ac to 50 V ac peak to peak input

Standard input is 1 pulse per revolution (user-programmable from 1 to 999†)
Sensor Excitation 12 V dc at 20 mA for proximity sensors,
12 V dc at 75 mA for all other sensors;
Optional 5 or 24 V dc available
Recommended Sensors

Optical - ROS-WROS-HT-W-25 

Proximity - P5-11

Magnetic -  M-190W or MT-190W

Infrared - IRS-W

Laser - ROLS-W or RLS-W 

IO Option 4 to 20 mA out, 16-bit resolution 12 V dc compliance voltage Full-scale RPM settings as specified when ordered


Analog Output (option) 0 to 5 V dc, 5 mA 16-bit resolution   
Full-scale RPM settings as specified when ordered
PO (option)

0 to 5 V TTL pulse, non-inverting, one pulse out for each pulse in 

(Positive or negative out programmable†)


This product is designed to be safe for indoor use under the following conditions (per IEC61010-1):
Installation Category II per IEC 664
Pollution Degree Level II per IEC 664


Operating Temperature: 32 °F - 122 °F [0 °C - 50 °C]

Humidity: Maximum relative humidity 80% for temperature up to 88 °F (31 °C) decreasing linearly to 50% relative humidity at 104 °F (40 °C)

*Specifications are subject to change without notice.
†Requires optional USB Programming Cable and PM Remote Software

PM Remote Software

PM Remote Software is a free downloadable Windows-based software application that allows users to quickly and easily customize the configuration of Monarch’s ACT-1B, ACT-3X, F2A1X, and F2A3X panel tachometers. Set the mode of operation to RPM, RPS, or Frequency and select the input scale (pulses per revolution). Real-time data can be displayed directly on the PC along with min and max values. Decimal places and display update rate are user-configurable.

Click here for complete details and to download the software.



  • Allows quick setup of ACT-1B, ACT-3X, F2A1X, and F2A3X
  • Display live data remotely on PC
  • Unit configuration can be saved for reloading in the feature

PM Remote Software Programmable Features


PM Remote Software Communications


Click here for complete details and to download the software.


Shipping Codes for ACT-1B Panel Tachometer (all models):

Harmonized Tariff Code:  9029205000

Country of Origin:  US

Export Control Classification Number (ECCN):  EAR99


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