The instrument has ranges of both 0-10 & 0-100 vpm with a sensitivity of less than 1 vpm. The analyser is based on a specially designed Pyrex quartz ionisation cell in which the sample gas flow is ionised in a high voltage alternating electrical field with consequential emission of light. A narrow spectral band corresponding to one of the specific light emission wavelengths of nitrogen is filtered by a narrow band-pass composite interference filter and then detected by a photomultiplier tube..
- Ranges: 0-10 vpm and 0-100 vpm Nitrogen in Argon
- Display: Analogue meter
- Limit of detection: Less than 1 vpm
- Sensitivity: Less than 1 vpm
- Zero drift: Less than 0.1 vpm per ºC
- Cycle/response time: Continuous/90% within 60 secs
- Accuracy: Depending on calibration gas available as it is a comparative method that is employed
- Sample flow rate: 2 litres per minute
- Sample inlet temperature: 10ºC minimum, 30ºC max.
- Sample inlet pressure: Optimum 0.35 to 1.05 bar g; maximum 3.5 bar g
- Sample outlet pressure: Maximum 0.15 bar g
- Sample pipework: 6mm or 1/4 OD stainless steel and PTFE
- Analogue output: 4-20 mA and 0-100 mV
- Alarm contacts: Adjustable high and low alarms with both normally open and closed voltage free contacts rated at 250V, 5A, AC non inductive
- Electrical supply: 110/220V, 60 Hz or 220/240V, 50 Hz single phase