Photosynthesis Monitor Model PTM-50

A new all-in-one instrument for monitoring growing plants and environment.


The new PTM-50 Monitor is a truly state-of-the-art automatic instrument for long-term recording physiological characteristics of intact plants.

The Monitor has four inputs for original motorized self-clamping leaf chambers. The chambers are normally open and encompass a leaf only for about 20 seconds to measure both CO2 and H2O exchange rates with minimal disturbance of natural leaf conditions. The standard round LC-10R Leaf Chamber with 10 cm2 aperture is suitable for wide variety of broad-leaf plants. The optional rectangular LC-10S Leaf Chamber is also available on demand.

The Monitor has two independent open-path channels for separate simultaneous analysis of ambient and after-leaf air. This provide perfect tolerance to fluctuations of ambient concentration of carbon dioxide and water vapor that is typical for greenhouses and growth chambers.

The Monitor provides fully automatic continuous operation with sampling rate selectable from 5 to 120 minutes.

The Monitor has both the 2.4 GHz RF modem and optional the 3G modem onboard. The RF modem is used for direct communication with a user’s PC and with optional wireless Phyto-Sensors™.

The overall configuration of the PTM-50 Monitor is shown below:


Mode of operation Continuous automatic
Number of leaf chambers 2 (min.) to 4 (max.)
Type of leaf chamber Motorized, normally open
Leaf chamber sampling mode Sequential
Chamber measurement cycle duration About 20 s
Sampling time interval 5 to 120 min, user-defined
Leaf chamber aperture 10 sq. cm
Standard hose length and inner diameter 4 m, ID=2.4 mm
CO2 measurement principle Non-dispersive infrared analyzer
CO2 concentration measurement range 0 to 1000 ppm
Measurement range of CO2 exchange -70 to 70 µmolCO2m-2s-1
H20 measurement principle Integrated air temperature and humidity sensor
Air flow control rates Adaptive, from 0.25 LPM  to 0.5 LPM,
Power requirements 9 to 24 Vdc
Communication Built-in 2.4 Ghz RF modem with the USB RF Adapter for PCOptional 3G Modem
Operating temperature 10 to 40 °C
Environmental protection index IP55


  • 1 x System Unit
  • 2 x LC-10R Leaf Chamber
  • 2 x Cable/Hose Duct for connecting leaf chambers (3.5 m)
  • 1 x Stainless Steel Tripod (1.5 m)
  • 1 x AC/DC Power Adapter
  • 1 x USB Communication Adapter
  • 1 x Container with CO2 Absorber
  • Software (English, Windows)
  • User’s manual (English)


  • 1 or 2 x LC-10R leaf chamber
  • 1 or 2 x Cable/Hose Duct for connecting leaf chambers (3.5-m)
  • 1 x RTH-50 Meter with the Pyranometer, Quantum (PAR) Sensor, Air Temperature, Air Relative Humidity, Rain&Dew sensors.
  • 1 x 1.5-m stainless steel tripods for leaf chambers
  • Wireless Phyto-Sensors™ Accent

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