Measuring-calculating devices (MCD) “Vulkan-2005M” and “Vulkan-2005M1” are developed for measuring steam and gas pressure in the given volume during determination of thermal stability of substances in isothermal mode, which is carried out by customer’s certified method, invented for each substance individually. MCD is certified by State Standard.

MCD operation is based on measuring gas pressure and decomposition vapor of substances in closed reaction chamber of the primary converter (in the vacuum chamber of the primary converter using Vulkan-2005M1 Vacuum Tester) in isothermal mode. The measurement results are recorded as graphical information (tables, graphs, etc.) on a PC. The MCD has an option to measure the pressure of various types of substances simultaneously by controlling the heating and measuring the pressure separately by each thermostat.

The pressure in the reaction chambers is measured by a direct method using semiconductor strain gauge differential pressure sensors. The set temperature is maintained programmatically using two heaters — internal and external. The temperature is measured using a platinum thermal resistance located in each thermostat heater. The device is equipped with a barometric pressure sensor for continuous measurement of ambient pressure.

Control modules that perform functions such as temperature control, pressure measurement, analog-to-digital conversion, are located on thermostats and working offline after the temperature has been set.

Technical specifications

• The barometric pressure measurement range is from 86.6 kPa to 106.7 kPa.
• The absolute pressure measurement range should be from 5 kPa to (Ratm. +250) kPa, (Ratm – atmospheric pressure)
• The pressure measurement error is allowed within:
  • barometric – ± 0.5 kPa.
  • overpressure – ± 2.0 kPa.
  • total (barometric + excessive) – ± 2.5 kPa.
• The temperature range of the primary converters is
  • from 50 to 280°C using reusable fluoroplastic gaskets
  • from 280 to 400°C using disposable aluminum gaskets
• Preset temperature maintenance in thermostat with absolute error within 0,1 °С.
• Thermostating temperature setting error within ±2 °С.
• The total volume of the container is 20 ml
• The minimum vacuum index is 5 kPa
• Structure of MCD includes up to 4 thermostats with 8 primary converters in each thermostat.
• Time interval between measuring cycles in automatic mode is about 1 second.
• Emergency protection triggers when the pressure or value temperatures given in control program are exceeded. The hardware overheat protection of the thermostat is triggered when the maximum operating temperature of the complex is exceeded.
• MCD is powered by AC mains voltage of 220V with permissible deviation limits from minus 15% to +10% frequency (50+1) Hz with distortion non-linear factor less than 5%.
• The operating mode of the thermostats begins less than 3.5 hours after switching on.
• MCD output power is less than 4000 W
• Dimensions (W x D x H): Outside 450 x 460 x 600mm
• Thermostat weight Net – 32 kg approx

Continuous operation time is more than 72 hours