Level Controller
Part Number: SENCL1 / SENEH14N
Product Overview
The solid-state Electrodes and Level Controller provide a reliable method of detecting fluid levels, which can be used to control the filling or emptying of a cistern. The Electrode Holder can accommodate 2, 3 or 4 electrodes, allowing a single unit to control between two levels and provide a lowlevel cut-out (this would require 2 controllers). One electrode is normally used for ground enabling the unit to function in GRP cisterns.
The Controller creates a latching characteristic, i.e. “delayed action” for filling or emptying. For example, the cistern only starts filling when the level drops below the longer (P2) electrode and stops filling when the level touches the short electrode (P1).
Conductive electrodes are maintenance free and are more precise than conventional float switches. The 3 mm diameter stainless rods are normally supplied 1 m long and can be cut to length on site. The electrodes are epoxy coated to prevent false signals caused by debris clinging to the electrodes. Low a/c electrode voltage prevents electrolysis. 50 mm should be stripped off the bottom.
The long electrodes are ideal where a type AB air gap is required, since float valves with a drop arm are very unreliable. The unit with a solenoid valve is particularly suitable for commercial feed and expansion tanks. The Level Controller is protected to IP55 and has a double pole double terminal volt-free output relay rated at 5A resistive. The second pole can be used for an alarm or BMS. Where the load is inductive a contact suppressor is recommended. The Electrode Holder requires a 28 mm hole in the cistern lid to accept the ¾” Male BSP thread. The top entry avoids sealing problems associated with side entry switches. The Controller features an LED indicating the relay is energised. A switch on the circuit board sets a high or low failsafe condition. Set “high” for cistern filling and low-level alarm.
Associated Products (electrodes):
• Level Controller (AC1)
• Dual Level Controller (AC2)
Specification Clause
Electrodes
The storage cistern shall be fitted with a conductive electrode set to detect the water levels – model SENEH31 as manufactured and distributed by Arrow Valves Ltd – Tel 01442 823123 www.arrowvalves.co.uk.. The electrode holder shall be fitted to the cistern lid and support 31 stainless steel electrodes. The electrodes shall be cut on site to suitable lengths. The electrodes shall be wired to an electronic controller, such as model SENAC1 or SENAC3
Insert as required:
[1] 4 or 5 (Denotes the number of electrodes)
Level Controller
The output from conductive electrodes shall be taken to a single1 channel electronic level controller – model SENAC12 as manufactured and distributed by Arrow Valves Ltd – Tel 01442 823123 www.arrowvalves.co.uk. The controller shall be housed in an IP65 enclosure, with a 230 V input and 25 V a.c. signal to the electrodes. The sensitivity shall be adjustable and the output per channel shall be via a double terminal, double pole volt free relay.
Insert as required:
[1] dual (i.e. one for filling cistern, second channel for low level)
[2] 2 (denotes two channel)
Application
• Filling a cistern via a solenoid valve (DN15 – DN150) – contact us for servo Solenoid Valves
• Emptying a cistern or sump
• Low-level pump cut-out
• High & low level alarm
Additional Resources