KROHNE LS 72xx EN - Manual (Page 8)

02/2013 LS 72xx 8
Wire break
Sensitivity too low
Insufficient electrode area
connections
Select higher sensitivity
Strip more insulation from
electrode
Constant level indication Short-circuit to ground, sensor
Short-circuit
Sensitivity too high (possibly
deposits)
Replace sensor
Check power leads, power
cable
Select lower sensitivity
With integrated level converter module
LED not “on”
Supply voltage < 18 V Measure voltage at pin 1, 2
No switching output Wire break
Supply polarity incorrect
Short-circuit
Check continuity of wires
Reverse terminals 1, 2
Check wiring
4 Technical data
4.1 Technical data table
Connection head Stainless steel V2A 1.4305; 55 mm dia.
Electrical connection Cable gland M16; M12 connector
Process connection Threaded socket G1/2“h; V4A 1.4571
Type of protection IP 67
Insulating part PEEK
Electrode 4 mm dia.; V4A 1.4571
(Option: PTFE coating)
Ambient temp. range –20...+60 °C
Process temp. range –20...+140 °C
Operating pressure max. 16 bar
Mounting position Rod electrode: above; stub electrode: any
With integrated level converter module
Indicating elements
1 LED red (level)
Power supply 18...36 V DC; 10 mA max. (no load switched)
Output min. Ub – 1 V, (50 mA max. short-circuit-proof)
Switching function full / empty polarity of supply power
Response time Damping 0.5 s
Sensitivity 200
Ω, 2 kΩ, 20 kΩ via control signal
With electrode output for level converter module
Output electrode
connection, ground connection