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Related Manuals for DALEMANS DAT 420
Summary of Contents for DALEMANS DAT 420
- Page 2 Copyright © 2020 by DALEMANS s.a. Revision V1R8 • 09/2020 Any reproduction, whether partial or entire, made of this doc- ument, by whatever means, without the prior, written consent of DALEMANS s.a. is strictly forbidden. All of the information contained in this document is non- contractual and is subject to modification without warning.
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Page 3: Table Of Contents
3.1. Location ..................... 11 3.2. Mounting ....................12 3.3. Field wiring ....................13 3.4. Connection to a DALEMANS control unit ..........14 3.5. Connection to a Programmable Logic Controller (PLC)......15 MAINTENANCE ....................17 4.1. Calibration ....................17 4.2. Sintered metal filter replacement .............. 17 4.3. -
Page 4: Warnings
Gas detection equipment must be calibrated at least once a year to mitigate the loss of sensitivity of the sensor. ▪ The warranty provided by DALEMANS will be voided if this equipment is not installed, operat- ed and maintained in strict accordance with these instructions, warnings and within the opera- tional limits stated. -
Page 5: Directive 2014/34/Eu (Atex)
Temperature class and maximum surface temperature of the equipment Gas group 450 °C 300 °C 200 °C 135 °C 100 °C 85 °C Butane Kerosene Methane Ethanol Nonane Toluene Methanol Acetaldehyde Octane Xylene Propanol Pentane Propane City gas Ethylene oxide Ethyl ether Carbon Hydrogen Acetylene disulphide www.dalemans.com... -
Page 6: Disclaimer
DISCLAIMER DALEMANS cannot be liable for direct or indirect damages arising out of the non-observance of its instructions. Every effort has been made to ensure the accuracy of the information given in this document. Nevertheless, DALEMANS decline any responsibility in the event of errors or omissions in this document. -
Page 7: Introduction
The DAT 420 gas detector is intended for monitoring industrial and commercial confined areas. DAT 420 is suitable for use in hazardous areas of explosive atmospheres. It operates in associa- tion with a compatible control unit or with a Programmable Logic Controller (PLC) to provide early warnings of gas hazard or oxygen deficiency. -
Page 8: Description
2.1. Overview The DAT 420 is a gas detector designed to detect the presence of toxic gases or oxygen deficien- cy in ambient air. It operates using an electrochemical sensor whose measure is converted by the transmitter into a 4-20 mA electrical signal which varies according to the gas/oxygen concentra- tion. -
Page 9: Sensing Head
2.2. Sensing head The sensing element of the DAT 420 gas detector is an electrochemical sensor operating accord- ing to the amperometry principle. The sensor detects gas by producing a chemical reaction be- tween gas and oxygen contained in the sensor. This reaction produces a small current which is proportional to the concentration of the gas. -
Page 10: Dimensions
2.3. Dimensions Figure 4: DAT 420 dimensions in mm www.dalemans.com... -
Page 11: Installation
The location of every detector must be recorded and available to the safety personnel. Should you require any further guidance or assis- tance please contact DALEMANS or his local representative. Consider the following points when positioning a gas detector: ▪... -
Page 12: Mounting
3.2. Mounting The DAT 420 gas detector should be mounted flat on a wall according to the dimensions below. ▪ Attach the detector using suitable screws and plugs. ▪ Always use the original wall mounting bracket supplied with the detector. -
Page 13: Field Wiring
3.3. Field wiring Always ensure that the electrical requirements of the DAT 420 gas detector meet the capability of the associated control unit or PLC (see “Specifications”). Please follow the instructions below: ▪ Field wiring must comply with local regulations and standards in force. -
Page 14: Connection To A Dalemans Control Unit
For instructions about the electrical connection of the control unit, please refer to the original equipment instruction manual. The connection of the DAT 420 gas detector to a DALEMANS control unit requires a 2-wire cur- rent loop. The electrical connection must be made with respect to polarity between the detector and the control unit. -
Page 15: Connection To A Programmable Logic Controller (Plc)
For instructions about the electrical connection of the PLC, please refer to the original equipment instruction manual. Prior to connecting the DAT 420 to a PLC please follow these instructions: ▪ Use an external stabilized power supply for the detector (+24 Vdc). - Page 16 Connection to a PLC To connect the DAT 420 gas detector to a PLC: ▪ Loosen the locking screw of the junction box cover using the 1.5 mm hex key and completely turn the cover counterclockwise to unscrew it. ▪...
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Page 17: Maintenance
Gas detectors must be calibrated at least once a year to mitigate the possible loss of sensitivity of the sensor. This calibration must be performed according to the procedure given by DALEMANS or his local representative, and in any case by qualified personnel who will have received a suita- ble training. -
Page 18: Troubleshooting
Spanner for base of sensing head (30 mm) OUT00000114 Spanner for top of sensing head OUT00000113 Stopper plug - Ex d M20 PRE00000033 Terminal block - Ex “e” 2 position BOR00000087 Transmitter board - 4-20 mA BASTRX00017 * Depends on the type of sensor used www.dalemans.com... -
Page 19: Specifications
SPECIFICATIONS MODEL DAT 420 Sensing head 1.4404 stainless steel (AISI 316L) Sintered metal filter Junction box Aluminium Dimensions 193 x 145 x 90 mm Weight 1500 g Output signal 2-wire 4-20 mA current loop Settings Zero and calibration by internal potentiometers Response time (T90) <... - Page 20 OFFICIAL DEALER Rue Jules Mélotte 27 • B-4350 Remicourt Tel. +32 (0)19 33 99 43 Fax +32 (0)19 33 99 44 sales@dalemans.com...