Level Sensors Amplifier, Conductive Type H 496 * Level control for conductive liquids * Max.- min. control of charging/discharging * Selection of charging or discharging by interconnection of the terminals * 3 sensitivity ranges, from 200 to 220 k, selectable by switch in the front * Adjustable sensitivity * Possibility of parallel connection * Level probe supply max. 6 Vpp, 1.5 mA, according to IEC 60364-4-41, PELV/SELV * Output: 8 A DPDT relay * LED-indication for relay and power supply ON * AC power supply Product Description Ordering Key Level control relay for conductive liquids which can control two levels of charging or discharging. The relay features sensitivity ranges from 200 to 220 k (5 m Siemens to 4.5 Siemens). If more than two levels are required, more relays can be coupled in parallel. Housing Type/function Output Power supply Output Supply: 24 VAC Supply:115 VAC Supply: 230 VAC DPDT H 496 166 024 H 496 166 115 H 496 166 230 H 496 166 230 Type Selection Input Specifications Level probe supply Level probe current Range 1: 200 - 2.2 k Range 2: 2.0 k - 22 k Range 3: 20 k - 220 k Clock in/clock out Reaction time Output Specifications 6 Vpp (IEC 60364-4-41, PELV/SELV) 1.5 mA 150 A 15 A Clock in: terminal 2 Clock out: terminal 1 Approx. 100 Hz 15 Hz square wave Duty cycle typically 60-40 For parallel coupling of amplifiers Always use screened cable to avoid ambient noise Screen must be connected to terminal 8 Approx. 1 s Specifications are subject to change without notice (25.06.99) Output Rated insulation voltage Contact ratings (Ag-CdO) Resistive loads AC 1 DC 1 or Small inductive loads AC 15 DC 13 Mechanical life Electrical life AC 1 Operating frequency Insulation voltages Rated insulation voltage Rated impulse withstand voltage DPDT relay 250 VAC (rms) (cont./elect.) (IEC 60947-5-1/IEC 60337) 8 A/250 VAC (2000 VA) 0.4 A/250 VDC (100 VA) 4 A/25 VDC (100 VA) 2.5 A/230 VAC 5 A/24 VDC 30 x 106 operations 2.5 x 105 operations (at max. load) 7200 operations/h 2.0 kVAC (rms) (cont./elect.) 4 kV (1.2/50 s) (cont./elect.) (IEC 60664) 1 H 496 Supply Specifications General Specifications Power supply Rated operational voltage through term. 21 & 22 230 Indication for Power supply ON Output ON Environment Degree of protection Pollution degree Operating temperature Storage temperature Scale accuracy Hysteresis Weight Overvoltage cat. III (IEC 60664) 230 VAC 15%, 50/60 Hz, -5/+5 Hz 115 115 VAC 15%, 50/60 Hz, -5/+5 Hz 024 24 VAC 15%, 50/60 Hz, -5/+5 Hz Voltage interruption 40 ms Rated insulation voltage 2.0 kVAC (rms) Rated impulse withstand volt. 4 kV (1.2/50 s) (line/neutral) Rated operational power 2.5 VA LED, green LED, red IP 20 B 3 (IEC 60664) -20 to +50C (-4 to +122F) -50 to +85C (-58 to +185F) +/- 20% 100% of set value 200 g Mode of Operation Max., min. control of charging/discharging. Example 1 The diagram shows the level control connected as max. and min. control, i.e. detection of 2 levels. The relay operates (out)/releases (in) when the liquid reaches the max. electrode (terminal 5), provided that the min. electrode (terminal 6) is in contact with the liquid. The relay releases (out)/operates (in) when the min. electrode is no longer in contact with the liquid. By use of a container of a conductive material terminal 8 can be connected to the container. If the container is made of a non-conductive material, an additional electrode is needed, indicated by the dotted line in the diagram. If only one level is required, terminals 5 and 6 must be interconnected, to select either max. or min. control. that one system determines the clock for all systems cascaded. Example 2 If more than 2 levels are required, two or more amplifires can be coupled in parallel, as in example 2. Pin 8 (clock out) and pin 9 (clock in) are connected to synchronize the clock in all systems - otherwise interference may occur. This means The clock in/clock out connection must be screened cable. In some cases screened cable must be used to achieve perfect operation e.g. in cable pits or trays where the sensor cable is placed in parallel with power cables. The screen must be connected to terminal 8. Wiring Diagrams Example 1 Example 2 Clock out Clock in Max. Min. 1: Clock out 2: Clock in 3-4: Charge 3-4: Charge Power supply Power supply Power supply PE=Terminal 8 (where used) 2 Specifications are subject to change without notice (25.06.99) H 496 Operation Diagram Power supply Max. Min. Relay (charging: in) Relay (discharging: out) Accessories Settings Conductive level probes: Left knob: Sensitivity. VN..., VNI..., VNY..., VNYI..., VT..., VTI..., VPP..., VPC..., VH... Right knob: Range selection Specifications are subject to change without notice (25.06.99) 3