A2109/LSR/002 Intrinsically Safe Optical-Contact Tachometer Pulse Output



The A2109/LSR Intrinsically Safe Optical-Contact Tachometer is the World’s first intrinsically safe Handheld Tachometer, the very high level of certification:

II 2G Ex ia op is IIC T4 Gb. – Intrinsically Safe Product Information and Certificates can be found Here

That allows use in a wide range of hazardous environments in petrochemical, Gas and volatile materials processing industries, the Advent Tachometers very comprehensive operational features provide the user with the ultimate in Optical and Contact speed monitoring not previously possible in hazardous areas.

Power Requirements & Battery Type, Batteries not included, Only use 4 x Industrial by Duracell, AAA 1.5v Professional Alkaline Battery.

There are Two Laser light source versions

  • Model A2109/LSR for measurement only
  • Model A2109/LSR/002 for measurement and pulse output facility

Display Features

  • Vertical display
  • Inverting Mode
  • Large LCD

Special Features: Capture mode

  • Maximum/Minimum: Captures Maximum speed in 0.1 seconds
  • Maximum/Minimum: holds Minimum reading during a measurement
  • Fast time-base: 0.1 seconds in Capture mode
  • Average: Averages over last 8 readings

Signal Output features: A2109/LSR/002 Pulse Output facility – 5v Pulse output, output via socket on rear of housing, supplied with 2 metre BNC output cable.

  • Pulse output facility
  • Tripod bush
  • Signal output cable
  • Remote on/off via cable

Contact Measurements: With the A2100/01 Contact Adaptor fitted as Supplied, rpm, rps, Metres, Feet, Yards per minute or per second, total revolutions or length.

Maximum speed with Contact Adaptor: Governed by upper speed limit of bearings and is affected by measurement duration, typically 50,000 rpm for 10 Seconds. Maximum linear rate is typically 1,500 metres/minute or 4,500 feet/minute.

Warning: The pulse output must only be connected through approved equipment.

Custom Cables can be made to order Please Contact Sales for now information.

Scope of Supply A2109/LSR/002:

  • Instruction Manual
  • A2109/LSR/002 Intrinsically Safe Optical-Contact Tachometer Pulse Output
  • Carrying Case
  • Hex Key
  • Reflective Tape
  • Certificate of Calibration
  • A2100/01 Advent Contact Adaptor
  • BNC Output Cable


Display Inverting LCD Vertical 5 digit display
Display Functions 180° degree Inverting
On Target Indicator Yes
Low Battery Indicator Yes
Function Icons Comprehensive selection of ranges shown in display
Optical Range 50mm – 2000mm
Optical Angle ± 80° degree to reflective marker
Light Source Red Laser Class II 635nm


Measurement Modes Optical rpm and rps (Also Count and Time interval)
Via contact adaptor rpm & rps, metres, yards, feet, per minute & per second
Count total revolutions, metres, feet, yards
Measure Time interval in seconds between pulses (Reciprocal rate)
Speed Capture feature – Maximum, Minimum or Average rate
Speed Range Optical 3 – 99,999 rpm
Speed Range Contact Maximum 50,000 rpm for 10 Second
Linear Speeds 0.30 – 1500.0 Metres (1 – 4,500 feet/minute)
Revolution Range Features Fully Auto-ranging up to 0.001 digit or ± 1 digit fixed, User selectable
Count Mode Revolution ± 0.1 Metres (Or equivalent in all ranges)
Accuracy Speed Modes Only 0.02% of reading ± 1 digit
Time Interval Mode 0 – 99,999 seconds Auto-ranging only (Maximum 0.01 revolution)
Time-base Standard 0.8 seconds or time between pulses
Time-base Fast Modes 0.1 seconds auto-selection in Maximum or Minimum capture mode
Memory Features Last reading held for 1 minute, Auto Switch Off
Program settings retained in memory after power down off
Pulse Output Model Active pull down via 22K Ohm series resistor
Power Requirements & Battery Type Batteries not included, Only use 4 x Industrial by
Duracell, AAA 1.5v Professional Alkaline Battery
Operating Temperature 0° / +40°C
Storage Temperature -10° / +50°C
Unit Dimensions 213 x 40 x 39mm
Housing Material High flow ABS – Metalised