5
OELD Operating Instructions
2 Overview
2.1 Introduction
OELD is hazardous location certified junction box for use with sensors that feature a 4-20 mA output. The OELD unit has been
designed to operate with the Searchpoint Optima Plus or Searchline Excel range of gas detectors. It provides a local visual status
indication, and a Bluetooth® low energy interface for configuration and maintenance using a Bluethooth®-enabled mobile device.
The OELD unit is ATEX and IECEx approved for use in either Zone 1 (gas) or Zone 21 (dust) hazardous areas as well as being cULus
approved for use in Class I Division 1 or Class II Division 1.
The OELD unit has five entries – either M25 or 3/4” NPT (dependent on the version) and is supplied with three certified blanking
plugs.
WARNING
The plastic transport caps supplied must be replaced with a sensor or suitably certified closers (such as glands or stopping
plugs) prior to commissioning the OELD. Failure to do so presents a potential source of ignition.
Internally, the enclosure features two earth connection points, and an electronics module with two pluggable terminal blocks
for connection of field and sensor wiring. The OELD features a four-color backlight (green, yellow, red and blue), and a custom
7-segment liquid crystal display (LCD). In operation, the LCD backlight provides a status indication as follows:
•
Green – Normal operation or Warning
•
Yellow – Fault or Inhibit
•
Red – Alarm (level is configurable)
•
Blue – Bluethooth® pairing / connection
Refer to section 6.1.2 Normal Operation for full details on this feature.
WARNING
Do not rely on the OELD LCD backlight status indication for safety-related purposes.
The OELD is configured using a mobile device (such as smart phone or tablet) over Bluetooth® Low Energy. The following
parameters can be configured:
•
Threshold for local alarm notification (red indication)
•
4-20 mA operational levels for the local display
•
Gas name, measurement units and range for local display
•
Additionally when using the OELD in conjunction with a Searchpoint Optima Plus or Searchline Excel, the user will be able to gain
full access to all configuration and maintenance parameters of the gas detector.
2 Overview
