3.8 Capacitance Probe Specification
Capacitance Probe Specification
Probe connection: ½” (13mm) – quick connect
Standard probe length: 20”, 30”, 40”, 50” and 60” (508mm, 762mm, 1016mm, 1270mm and
1524mm)
Other probe lengths available upon request
Stainless steel probe
PTFE coated
IP 68 rating
Temperature rating of housing: 0 - 70°C (32 - 158°F) - ambient temperature of air around the boiler
Flying Lead Length: 2m
Note: The probes must not be cut. If the probes are cut this will act as a short between the positive
and negative plates of the capacitor and will stop the probes from working.
If the probes are mounted directly into the boiler shell it is important to lag the flanges in order to avoid
overheating of the electronics.
The following table illustrates the pressure tests on the probes:
Nominal Size of Line Maximum Allowable
Pressure
Maximum Allowable
Temperature
Test Pressure
½” (15mm) 392 PSI (27 bar) 446°F (230°C) 870 PSI (60 bar)
3.8.1 Capacitance Probes Terminals
Probe No.1
Colour Description Terminal
Red Power Supply + 1P+
Blue Power Supply - 1P-
Green Data Transmission + 1T+
Yellow Data Transmission - 1T-
Probe No.2
Colour Description Terminal
Red Power Supply + 2P+
Blue Power Supply - 2P-
Green Data Transmission + 2T+
Yellow Data Transmission - 2T-
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