MODEL KS-502-VS

 MICROPROCESSZOR CONTROLLED AIR- AND GAS SAMPLER FOR SUCTION OF SAMPLE GAS THROUGH GASWASH VESSELS, AND/ OR SORPTION, VOC AND/OR PUF PIPES

KS-502-VS

1. Purpose

For determination of the polluting material emission of the end gases serve the adsorption and adsorbtion sampling methods. According to the known measurement principle, gas of known quantity is led through a sorbent of adsorbent solution most effectively binding the polluting material, then the samples are analysed by some method. Major elements of the sampling chain are the sampling probe, the sampling pipe or absorptive vessel, the volume flow meter and the pump.

For conversion of the volume of the suctioned gas to normal state, the temperature and pressure resp. the barometric pressure have to be known.

The type KS-502-VS automatic microprocessor controlled air and gas sampler provided with a micro Venturi eliminates the disadvantages of the volume flow meters (gas meter, rotameter, mass flow meters) employed so far for emission-, immission-air and gas samplers. It is a fundamental difference that by means of temperature and pressure sensors connected to the control electronics the measurement of the sampled gas is based on the known Bernoulli-equation.

When measuring volume flow at the micro orifice, the volume flow, q, of the flowing gas can be calculated as follows:

[m3/s]

where:

    a - through-flow factor, a = f(Re, m), [1]

    A - cross section of the throttle element, [m2]

    r2 - gas density, [kg/m3]

    Dp2 - pressure drop occurring across the throttle element, [Pa]

2. Technical description

The partial gas flow suctioned from the main gas flow, after passing through an intake device, (Figure 1. and 2.), gas washing vessels or sorption pipes /2/, arrive at the drying column /5/.

SPECIAL FEATURES

  • Possibility of controlling the measurement from a distance of 100-200 [m] from the place of sampling.

  • Versatile application possibilities, wide sampling [ lN/h] [ lN ] and measuring ranges.

  • A high-precision, long-life volume flow meter, practically insensitive to contamination.

  • Sampling volume flow stabilisation, continuous regulation to the set values.

  • Moisture separator, drier and dust filter.

  • Sampling with gas washing bottles and/or GC sorption, VOC and/or PUF pipes.

  • Microprocessor control, PC connection possibility for data polling.

  • Full-scale LCD display for checking of the summed volume [lN], and the volume flow [lN/h].

  • Portable, lightweight design and ease of handling, data protection and storing, restarting in case of power failures.

  • Operable as required from 230 [V] mains voltage or, for 6 hours, from a 12 [V] 55 Ah battery.

    • From here, after being dehumidified and passing through a dust filter and interconnection pipe /6/ it enters into the micro orifice existing in the measuring control unit /7/, then after passing through the pump exhausts into the atmosphere. The volume flow measuring and evaluating unit, by processing an electric signal proportional to the temperature (t2) of the intake gas, the pressure signal of the micro orifice (Dp2, pst2), as well as the loaded data, measures the quantity of the through-suctioned air [ lN/h ], the total volume suctioned during the sampling, in [ lN ], and the sampling time.

    3. Technical data
  • Nominal flow rate:
    		• qN = 70 [ lN/h ]
  • Max. flow rate:
    		• qmax = 220 [ lN/h]
  • Min. flow rate:
    		• qmin = 28 [ lN/h]
  • Accuracy of the flow-meter
    		• ± 3 [%]
  • Weight:
    		• 3,8 [kg]
  • Size:
    		• 320*280*170 [mm]
  • Current supply:
    		• 230 [V], 50 [Hz], 100 [VA]
  • Stabilised mass-flow
    		• ± ± 2 [%]
  • Endfilter:
    		• Æ 50 [mm]

    Figure 1.