Connecting Cable; Cable Connection - Teledyne OLCT 60 User Manual

OLCT 60
FIXED POINTGAS MONITOR
USER MANUAL

2.6 Connecting cable

The detector shall be connected to the controller with a 3-wire shielded cable. Core size depends
on the specific requirements of the installation, the distance and type of detector (see table
below).
Type of detector Type of sensor
Explosimeter Catalytic
Explosimeter Infrared (GD10P)
Toximeter Electrochemical
Oxygen detector Electrochemical
Freon Semiconductor
Table 2: Maximum distance cable (with 24 Vcc at controller terminals)
The cable must be shielded to reduce the influence of electrical and radio-frequency interference.
A cable such as AFNOR M 87-202-01-IT-15-EG-FA (Nexans) may be used. It shall be selected
according to the type of detector and in accordance with the table shown hereinabove. Here are
some more examples of suitable cables:
Safe area: CNOMO FRN05 VC4V5-F
ATEX zone: GEVELYON (U 1000RHC1)
ATEX zone: GVCSTV RH (U 1000)
ATEX zone: xx-xx-09/15- EG-SF or EG-FA or EG-PF (U 300 compatible with M87202).
The maximum permissible length will depend on the cross-section of the cable conductors (see
table) and on the minimum admissible supply voltage at the detector terminals.

2.7 Cable connection

2.7.1 Turn off the line
On the controller:
1. Inhibit any alarms to prevent false alarms during operation.
2. Switch off the power supply to the detector.
12
Maximum length (km)
depending on the core size
0..5mm² 0.9 mm²
(AWG (AWG
20) 18)
0.55 1.0
0.40 0.80
1.0 1.8
1.0 1.8
0.55 1.0
Maximum
load
resistance (Ω)
1.5 mm ²
(AWG
15)
1.7 250
1.4 250
3.0 250
3.0 250
1.7 250
NPO60GB
Revision F.2