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Delivery is carried out as soon as possible after the order is placed.
Purpose
The DZU-GERDA sensor is designed to measure the level of gas contamination in indoor and outdoor environments in areas where hydrocarbon gases and vapors may be present near process equipment, storage tanks, loading racks, trunk pipeline pumping stations, compressor stations, gas storage facilities, boiler houses, and other industrial sites.
Sensor Description
The operating principle of the sensor is optical-absorption, based on a dual-channel infrared photometer scheme. The sensor is manufactured in an explosion-proof version with a housing made of corrosion-resistant aluminum alloy. The sensor housing includes a cable gland and a sensor module (see photo). Atmospheric air enters the sensor’s measuring cuvette through free diffusion. A protective filter prevents dust, dirt, and precipitation from entering the measuring cuvette. The current gas concentration level is displayed on a digital indicator in the sensor housing window, while threshold exceedances are indicated by LEDs.
The sensor performs the following functions:
| Parameters | Values | ||
| Explosion protection marking (GOST IEC 60079-1-2011) | 1 Ex d IIС T4 Gb | ||
| Hazardous area classification for sensor installation | In accordance with Ex marking and GOST IEC 60079-14-2011 | ||
| Detected components | Hydrocarbon gases and vapors | ||
| Measurement range of concentrations | From 0 to 99% LEL | ||
| Indication | measured concentration | 2-digit seven-segment display | |
| threshold exceedance | 2 red LEDs (Threshold 1, Threshold 2) | ||
| failure | 1 red LED (Failure) | ||
| Alarm threshold range | From 0 to 99% LEL | ||
| Basic measurement error limits Dо | ± 5% LEL | ||
| Response time t(90), max | 14 s | ||
| Warm-up time (startup), max | 1 min (10 min for extended temperature range) | ||
| DC supply voltage | From 10 to 28 V (nominal 24 V) | ||
| Power consumption, max | 3 W (5 W for extended temperature range) | ||
| Output signal type (specified when ordering) | analog * | 4—20 mA, 3- or 4-wire connection scheme (including sensor 24V power wires); service data transmitted in the 0–4 mA range; maximum communication line resistance 700 Ohm | |
| digital ** | RS-485 interface with protocol (selectable): – ModBus-RTU – SKZ-12-Ex-01.M1 – HART maximum communication line length 1200 m | ||
| relay *** R1 R2 | “dry” relay contacts (Threshold 1, Threshold 2, Failure): — switching capacity 1 A/48 V DC, — switching capacity 3 A/250 V AC | ||
| Ambient temperature | standard range | From –40 to +60 °C | |
| extended range | From –55 to +75 °C | ||
| Ingress protection rating (IP code) | IP65 | ||
| Relative humidity at 35 °C | up to 95% without condensation | ||
| Overall dimensions (WxHxD) | 220 × 242 × 140 mm | ||
| Calibration interval | 1 year | ||
| Weight, max | 3 kg | ||
| Designated service life | Sensor | 5 years | |
| Detector | 10 years | ||
| Warranty period | 2 years | ||
It is recommended to use the following cables for DZU-GERDA connection: * ** *** for connection of power wires, Threshold 1 and Threshold 2 signals: Note: For other conductor cross-sections, sheath and insulation materials of KUIN and KVIP cables, refer to separate cable brochures. | |||
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