APSA-370 with CU-1 High Sensitivity Model is high sensitivity gas analyzer for measurement of hydrogen sulfide (H2S) concentration at extremely low parts per billion level of concentration. APSA-370 with CU-1 uses an oxidation catalyst to convert hydrogen sulfide (H2S) into sulfur dioxide (SO2), which is later measured by ultraviolet fluorescence (UVF) method. Analyzer has installed into the sample line dehumidifier to reduce indication errors due to chanages in the atmospheric moisture concentration and to stabilize the catalytic reaction. This results into long-term stability of measurement. Measurement range 0 – 10 / 20 / 50 / 100 ppb and Lower Detection Limit 0.1 ppb enables application of the analyzer for the cleanroom airborn molecular contamination monitoring, ambient air background monitoring, monitoring of the cultural property preservation environment etc.
| Component | Hydrogen Sulfide |
| Model | APSA-370/CU-1 (High sensitivity model) |
| Principle | UV Fluorescence method + Oxidation catalyst |
| Range | 0 – 10 / 20 / 50 / 100 ppb |
| Lower detection limit (LDL) *Typical value under certain conditions | 0.1 ppb |
| Response time (T90) | Within 5 minutes from CU-1 sample inlet |
| Displayed components | Instantaneous value of H2S |
| Analog output | 4 – 20 mA DC or 0 – 1 V DC |
| Communication interface | RS-232C or TCP/IP |
| Sample gas flow | Approx. 0.7 L/min |
| Operation gas | N/A |
| Calibration gas | N2 based SO2 diluted by pure air from SGGU-610 or by ultra-pure air from gas cylinder |
| Ambient temperature | Cleanroom temperature |
| Ambient humidity | Cleanroom humidity |
| Power | AC100 – 120 V, AC200 – 240 V |
| Configuration (analyzer & calibration equipment) | APSA-370/CU-1 (High sensitivity model) SGGU-610 |
