Oldham MX48 - 2-Wire Detectors 4-20 Ma: 2 Connecting Wires for Shielded Cable; FIRE Detectors: 2 Connecting Wires for Shielded Cable; FLAME Detectors: 2, 3 or 4 Connecting Wires for Shielded Cable Depending on Utilization

12
2.3.3. 2-wire detectors 4-20 mA: 2 connecting wires for shielded cable
- Resistance of detector / unit cable: 32 ohms maximum per wire, i.e. 64 ohms in loop
(2 km for cable 2 x 1.5 mm²).
- Connection on MX48 unit: see Fig. 11. – Example 2
2.3.4. FIRE detectors: 2 connecting wires for shielded cable
The current commercial designations are as follows:
- “Thermovelo” detectors of type EC 11 (sensitive to temperature variations)
- Ionic detectors of type EI 1 100 (sensitive to smoke)
- Optical detectors of type EO 1 100 (sensitive to smoke)
- Resistance of detector / unit cable: 28 ohms maximum per wire, i.e. 56 ohms in loop (2 km for
cable 2 x 1.5 mm²)
- Fire detectors can be detected in parallel to a maximum of five. The end-of-loop resistor
(2.7 K) is to be placed at the end of the line on the last detector.
- Connection on MX48 unit: see Fig. 11. – example 1
2.3.5. FLAME detectors: 2, 3 or 4 connecting wires for shielded cable
depending on utilization