Exd Dew-point Hygrometers for Hazardous areas
3Pages

Flame Proof Single Channel Dew Point Hygrometer for Ex Hazardous Areas DS4000-Exd-AMT-Ex is a single channel, online hygrometer with isolator designed to accurately measure trace moisture in process gases utilising a range of dedicated, ultra high capacitance, field mountable transmitters. The DS4000-Exd-AMT-Ex is designed to take dewpoint readings in Ex Hazardous areas Zones 1, 21, 2 and 22. It is Flameproof to ATEX and IECEx Certification for use in potentially explosive atmospheres. The system incorporates an automatic calibration (AutoCal) facility and encompasses measurement needs from -120 °C to +20 °C (-184 °F to +68 °F) dewpoint. The sensor/transmitter is highly sensitive and has been designed and conditioned for long term stability. Additionally, the transmitter is ATEX certified for intrinsic safety so can be used in hazardous environments with the isolator in the DS4000-Exd Unit. There are three Hot Key front panel key functions to gain rapid access to set alarms trip points and choice of displayed engineering units. These functions can be locked to prevent unauthorised tampering. Side View AMT-Ex Transmitter. IP66 Rating. Users may choose to view the trace moisture levels in °C dewpoint, °F dewpoint, ppm(v), ppm(w), g/m³ or lb/MMSCF on the 5 digit, seven segment LED display. The factory calibrated, but fully configurable, 4-20mA output is automatically linearly correlated with all the selected engineering units. DS4000-Exd-AMT-Ex contains two independent, fully user programmable alarm contacts to provide all the versatility required for any application. A digital communication channel is provided via a RS485 serial connection for remote interrogation of measured values and status of alarms and instrument. Should the need arise to set up the instrument differently to the factory provided configuration then a highly flexible, user configurable setup menu is built in. The features within the setup menus are protected by user configurable passwords to limit access and protect against unauthorised changes. Works with a range of sensors covering an overall range from -110 °C to +20 °C dewpoint (-166 °F to +68 °F) Units selectable for °C Td, °F Td, ppm(v), ppm(w), g/m³ or lb/MMSCF Calibrations traceable to International Humidity Standards AutoCal calibration adjustment to maintain accuracy between laboratory calibrations On board pressure dewpoint calculator, including data for Natural Gas Molecular mass pre-loaded for ppm(w) in common gases, other gases can be entered Two fully programmable alarms with 10A relay contacts and status LEDs RS485 port for digital output of measured value Hot Key functions for rapid access to set alarms and units, can be locked to prevent tamper Ex certified sensors for Hazardous Area use (via Zener barrier in

Alpha Moisture Systems Model DS4000-Exd Specifications DiSPlAy Type: Maximum No. of addresses: 99. Baud Rate: Selectable – 1200, 2400, 4800 or 9600. Red 7-segment 5-digit primary display, and secondary display. Height: 14mm (0.71inches) primary display, 7mm (0.3 inches) secondary display. Annunciators: Alarm 1 and Alarm 2 status LEDS. SENSOR/TRANSMiTTER (AMT-Ex) Standard Dewpoint Ranges Available: Various between –120 °C to +20 °C (0.0001ppb(v) to 23,000ppm(v) Accuracy: Better than ±2 °C (3.6 °F) over full range Operating Temperature: –20 °C to +50 °C Storage Temperature: –50 °C to +70 °C...

Alpha Moisture Systems Model DS4000-Exd Select a Range Below SR: Pl: RD: Gy: SD: lD: HD: Select a Display Unit Holder Logging dewpoint dewpoint dewpoint dewpoint dewpoint dewpoint dewpoint °C Dewpoint °F Dewpoint ppm(V) lb/MMSCF g/m3 Voltage Output Current Output Select a Retransmission Output Select Alarm 1 Configuration High Alarm, Direct action (normally de-energised relay) High Alarm, Reverse action (normally energised relay) Low Alarm, Direct action (normally de-energised relay) Low Alarm, Reverse action (normally energised relay) Select Alarm 2 Configuration High Alarm, Direct action...