CMC20A Current Meter CounterCMC20A Current Meter CounterCMC20A Current Meter CounterCMC20A Current Meter CounterCMC20A Current Meter Counter
CMC20A Current Meter Counter

CMC20A Current Meter Counter

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HyQuest Solutions’ current meter counter CMC20A is an enhanced version of the proven model CMC20 which is used with the majority of propeller current meters. CMC20A is a self-contained instrument featuring microprocessor control circuitry, a quartz time…  Read more

Brochure
Housing Submersible powder coated aluminium die cast case, nylon webbing adjustable neck strap
Display (LCD) 4 digit high temperature liquid crystal display rated to 80 °C
Accuracy ±0.1 seconds (timed from first contact closure); ±1 pulse
Timer Quartz crystal accuracy, better than 1 in 20,000
Preset Facility Time intervals of 10, 20, 30, 40, 50, 80, 100, 200 seconds, and infinity
Infinity Mode For depth measurements with ground-feeler weights, manual operation of counter or integration measurements
Operating Conditions Temperature range: -20 °C to +7O °C; Humidity: O - 100 %
Contact Debounce

The current meter pulse is debounced in software. 

Debounce time user selectable 1, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 45 ms (useful for a meter with a mechanical “cat whisker” contact wire)
Buzzer
  • Instantaneous beep for each current meter pulse (except in the infinity mode)
  • Infinity mode: continuous beep while the current meter switch or ground feeler weight switch is closed
Power Supply
  • 9 V DC - 6 AA alkaline batteries (or 6 AA nickel metal hydride NiMh)
  • Actual battery voltage displayed for 2 seconds each time the counter is switched on
  • Low voltage indicated by all decimal points showing on the display at 5.8 volts
Dimensions & Weight
  • 160 x 100 x 55 mm (6.3 x 3.9 x 2.2 ”), 1 kg (2.2 lbs)
  • Packed: 260 x 195 x 160 mm (10.2 x 7.7 x 6.3 ”), 1.3 kg (2.9 lbs)

HyQuest Solutions’ current meter counter CMC20A is an enhanced version of the proven model CMC20 which is used with the majority of propeller current meters. CMC20A is a self-contained instrument featuring 

  • microprocessor control circuitry, 
  • a quartz time base, 
  • a high temperature liquid crystal display (LCD), and 
  • a buzzer.

This simple counter displays the accumulated pulse count for a range of preset time periods. The display gives continuous indication of the pulse count during the course of the reading period. It indicates with a resolution of 1. The maximum number of counts is 9999.

An internal buzzer sounds at each contact closure to indicate correct operation. When used for integrating depth measurements with a ground-feeler weight, the buzzer sounds continuously while the contacts are closed and counting continues (infinity mode) until interrupted manually by the stop switch.

HyQuest Solutions’ Range of Current Meter Counters

HyQuest Solutions offers various current meter counters from the simplest model to advanced versions with enhanced features. They provide waterproof enclosures, simple button controlled menus, embedded LCDs and beepers to make counts audible. The sampling period can be pre-set or manually stopped. Further options: calculation and direct display of velocity, signal conditioning for improved accuracy, data transmission via bluetooth interface to HydroTab Stream Gauging Computer or other external PCs for discharge calculation. We are happy to provide help in choosing the proper device for your application.

  • Accurate timing: timer starts at the first contact closure
  • User selectable contact debounce time
  • Counts up to 40 pulses per second
  • Battery voltage displayed on power up
  • Designed to USGS specifications
  • Robust construction, submersible
  • Adjustable neck strap
  • Water velocity and water flow measurements in small and big water courses and open channels
  • Field calibration of tipping bucket rain gauges (counting bucket tips)