MST PID-TVOC sensor The MST PID-TVOC sensor is a detector base photoionization detection.It can be easily installed onto handheld/portable/online VOC monitoring in struments(for example,handheld TVOC monitors),and is good to use around fenceline,EXarea,etc. Due to the safety of the PID, it is very easy to be integrated in other system,while considerably reducing the R&D cost.The mechanism is that the gas molecules with ionization potential than the ionization energy of the UV lamp will be detected,such as some VOCs.When pass through the UV channel, these gas molecules are ionized generating electrical signals,followed by being converted to concentrations values. Ａｐｐｌｉｃａｔｉｏｎｓ  National security  Grid monitoring Unique brass nickel-plated housing, antielectromagnetic interference Cover single hole, Double waterproof breathable membrane Low noise, high sensitivity, low detection limit 2 point calibration, Small linear error  VOC online emission monitoring  Leak detection  R2≥0.995 (whole range)  High performance UV lamp, Better stability  Explosion-proof: Ex ia C T4 Ga  Options: 10,000ppm, 5,000ppm ,

Optional configuration and performance Optional range 10.6eV(Isobutylene) 10,000 ppm MDQ (Isobutylene)  Temperature : -40°C to 55°C  Relative Humidity : 0 to 93%(NonCondensing)  Humidity Response:<1%@93%rh  Humidity Quenching Effect:<15%@ 93%rh Physical Characteristics Ｅｌｅｃｔｒｉｃａｌ Pａｒａｍｅｔｅｒ Supply Voltage: 3.2V –5.5 VDC Current: 30 mA –45 mA Power Consumption: 90 mW –250 mW (Depending on supply voltage and temperature) Output: 0.045 V –2.9 V Appearance type: 4 series 3 pin mode (Industrial standard) Components: detector cell, channel, filters (2), UV lamp, seal, spacer Uv Lamp life: <10000h...

Zero point noise Pass zero air for at least 1 minute, test sensor zero. The 15s data interval (red dot) was selected, and the mean value was taken as the zero value and the multiple standard deviation (1ݜ)as the zero noise. PID2 ίܳｉｇｎａｌ（ｍＶ） ６０．９５ Stanfard Deviationzm(mV) Detection Lower limit (MDQ) Sample concentration corresponding to 3 times signal-to-noise ratio (S/N) is used as the detection limit of the sensor (theoretical calculation value). The sensitivity of the sensor is closely related to the ionization energy and other properties of the measured substance. For different gas under test,...

Temperature influence - zero drift The normal operating temperature of the sensor is -40°C to 55°C. Using the zero value at 20 °C as the base, the effect of temperature on the zero drift is ±15ݑڰݑ. Zero drift Signal Variation (mV) Temperature influence - Sample signal and linearity With the sample signal value at 20 ЂC as the benchmark, the influence of temperature on the sample signal is shown in Figure 1 below, and the signal output changes with the temperature by Ђ10%. The influence on the full-scale linearity of the sensor is shown in Figure 2 below.

60 °C 50 °C 30 °C 20 °C 0 °C -13 °C -24 °C Linear (60 °C) Linear (50 °C) Linear (30 °C) Linear (20 °C) Linear (0 °C) Linear (-13 °C) Humidity influence - zero drift The normal humidity of the sensor ranges from 0 to 93%rh (non-condensing). The influence of humidity on zero point signal is shown in the figure below (less than 1%). MST-PID 85 Humidity effect - Sample signal Usually, the high relative humidity results in low sensor signal. This is because some substances with ionization energy greater than 10.6eV (eg. Water) will absorb the photoelectron energy, but will not be ionized, resulting...

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