Oldham olct 80, Technical Manual

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Sensor OLCT80(D)
Manufacturer ISC/OLDHAM SA
Type Detector - transmitter
Gases detected Explosive, toxic and oxygen
Detection principles
Catalytic
Electrochemical
Infrared (IR)
Semi-conductor (SC)
Range see table
Sensor block Pre-calibrated
Material Stainless steel 316L
Casing Aluminium
Display
Backlit 4-digit LCD display for measurement and one alphanumerical
line for texts, pictograms - 4 indicator lamps: one green power lamp,
one yellow fault lamp, two red lamps for alarms 1 and 2
Power supply to sensor terminals Two independent inputs: 16 to 28 VDC (catalytic / IR / SC sensors)
12 to 30VDC (electrochemical sensor)
Maximum power with digital link 0.2 W (electrochemical sensor) -1.3 W ( catalytic / SC ) -5.3 W (IR)
with I output at 25 mA 0.9 W (electrochemical sensor) -2 W ( catalytic / SC ) -6 W (IR)
with I output at 25 mA and relays
activated 2.4 W (electrochemical sensor) - 3.5 W ( catalytic / SC ) -7.5 W (IR)
Inputs Two analogue inputs 4-20 mA (load resistance 120 ohms)
Outputs:
Logic (relay contacts) 3 potential-free relays
analogue Current source encoded from 0 to 25 mA (non-isolated)
4 to 20 mA linear current reserved for measurement
0 mA indicates an electronic fault or no power supply
An output of 1.5 mA indicates an optical fault, Temperature outside limit
A 2 mA output indicates calibration mode
An output greater than 23 mA indicates a range overrun
digital Two independent opto-isolated RS485 ports
Alarms 2 programmable thresholds per channel
Relays
type 1 pole
number 3 (2 alarm + 1 fault)
contact RCT changer-over
breaking capacity 2A / 250 VAC / 30 VDC
wiring / connection Basic version, 6 inputs: 4 M20 and 2 M25
On request: 3 additional, 2 M20 and 1 M25
Load resistance on the 4 / 20 mA 500 Ohms
Loop resistance (on ISC/OLDHAM
central unit) Under central unit 21 VDC: 128 ohms ( electrochemical sensor ) - 32
ohms ( catalytic / SC ) - 16 ohms (IR)
Fastening lug See drawings
Protection factor IP 66
Operating temperatures
- 25 °C to +55 °C ( electronics, see table for detection cells )
Note : Performance levels are reduced at higher temperatures (max. 70°C):
contact us for details.
Dimensions See drawings
Weight OLCT 80: 3.5 kg
ATEX certification
Conforms to Directive
94/9/EC, see ATEX
paragraph
Electromagnetic compatibility Complies with EN 50270