Remote measurement of under-explosive concentrations of combustible gases and vapors of petroleum products.
Specifications
| Detectable components | propane, methane, butane, hexane | ||
|---|---|---|---|
| Verification gases | propane, methane | ||
| Measurement range, % of LEL | from 0 to 100 | ||
| Principle of measurement | optical absorption | ||
| Interval between verifications, months | 24; 12 (for model on -60 ℃) | ||
| Indications setting time (T90), s, not more than | 60 | ||
| Heating time, s, not more than | 120; 3600 (for model on -60 ℃) | ||
| Nominal power supply voltage (DC), V | 9; 27 (for model on -60 ℃) | ||
| Acceptable power supply voltage (DC), V | from 4.5 to 30 1) | ||
| Power consumption, W, not more than | 2.5; 20 (for model on -60 ℃) | ||
| Interfaces (protocols) | power and signal line SENS (SENS protocol), RS-485 (protocols SENS, Modbus RTU), 4-20 mA (HART protocol) | ||
| Signal relay features: | maximal switchable DC/AC voltage, V | 30 / 42 | |
| maximal switchable current, A | 0.5 | ||
| Number of configurable thresholds of alarm signaling | 5 | ||
| Diameter of connectible cable without armor, mm | from 5 to 18 | ||
| Maximal cross-sectional area of connectible conductors, mm², not more than | 2.5 | ||
| Materials contacting the environment | AlSi7 (analogue of AlSi7Mg), steel 20, steel 12Cr18Ni10Ti, steel 14Cr17Ni2, AISI 431 | ||
| Main absolute inaccuracy within range from 0 to 60% level measurement of LEL, % LEL, not more than | ±3 | ||
| Main relative inaccuracy of measurement withing range from 60 to 100% LFL, %, not more than | ±5 | ||
| Ambient temperature range, ℃ | from -40 (-60) to +60 | ||
| Protection degree as per GOST 14254 | IP66 | ||
| Explosion-proof marking | 1Ex db IIB T6 Gb; 1Ex db IIB T4 Gb X (for model on -60 ℃) | ||
| Overall dimensions W x H x D, mm, not more than | 240 × 240 × 170 | ||
| Mass, kg, not more | 3; 4 (for model on -60 ℃) | ||
| Service life, years | 15 | ||
| Mean time between failures, hours, not less than | 15000 | ||
Note. 1) when the unit is equipped with "SENS" interface maximal power voltage is limited to 18V | |||