Capacitive levels controllers

Transcription

1 Capacitive levels controllers for automatic control, regulation and signalling of levels of conductive and non-conductive liquids or pourable bulk goods Jola Spezialschalter GmbH & Co. KG Klostergartenstr Lambrecht (Germany) Tel Fax B

2 Contents Page Brief introduction into the mode of operation of capacitive level controllers Capacitive proximity sensors Capacitive switching devices Brief introduction into the mode of operation of capacitive level controllers The capacitive proximity sensors and the capacitive switching devices described here are designed above all for the registration and control of the level of liquids and pourable bulk goods. The function of the proximity sensors is based on the change in capacity of the electrode located in the active surface of the proximity sensor. This change in capacity is generated by proximity or contact of the liquid/pourable bulk good to/with the active surface of the proximity sensor. The system components are the capacitive proximity sensor on the one hand and the capacitive switching device on the other, the capacitive proximity sensor being connected to the capacitive switching device. A distinction can be made between: capacitive proximity initiators (our types CNI ) and capacitive proximity switches (our types CNS ). The difference between a capacitive proximity initiator and a capacitive proximity switch consists in: with capacitive proximity initiator the power consumption continuously changes in function of the distance between the liquid / the pourable bulk good and the active surface, with capacitive proximity switch the power consumption suddenly changes when the liquid / the pourable bulk good approaches the active surface at an exactly defined distance. We generally advise against the use of capacitive proximity sensors if: the dielectric constant of the medium is variable, due to pronounced adhesive characteristics of the medium, a precisely defined response of the proximity sensor is no longer assured (see application example 1 on page 8-1-2), due to medium deposit on the sensor, uncontrolled activation is possible (see application example 2 on page Seite 8-1-2), the installation options, e. g. the length of the pipe connector and the length of the sensor tube, do not allow location of the active surface of the proximity sensor outside the area of influence of the tank wall (see application example 3 on page 8-1-2)

3 Application examples The units described in this documentation may only be installed, connected and started up by suitably qualified personnel! Subject to deviations from the diagrams and technical data. The details in this brochure are product specification descriptions and do not constitute assured properties in the legal sense

4 Capacitive proximity initiators with screw-in nipple G 1 /2 short version Technical data CNI 1 /2 /PP CNI 1 /2 /PVDF CNI 1 /2 /PTFE Mode of operation: NO contact CNI 1 /2 /PP-S CNI 1 /2 /PVDF-S CNI 1 /2 /PTFE-S NC contact CNI 1 /2 /PP-O CNI 1 /2 /PVDF-O CNI 1 /2 /PTFE-O All parts in contact with the liquid / the pourable bulk good PP PVDF PTFE Screw-in nipple G 1 /2 Length of sensor tube, measured from the nipple sealing surface approx. 60 mm, up to 200 mm on request Connection head PP with cable entry M 20 x 1.5, protection class IP 54 Electrical design DC, 2-wire design Voltage range DC 4 V to DC 24 V, preferably to NAMUR: DC 8.2 V (with R i = 1 kω) Power input at an operating voltage of U = DC 8.2 V (with R i = 1 kω) Activation distance NO contact: inactive < 1 ma, active > 3 ma NC contact: inactive > 3 ma, active < 1 ma adjustable in the connection head via multiturn potentiometer between 0 and approx. 15 mm Self-inductance approx. 0 Self-capacitance approx. 100 nf Pressure resistance max. 2 bar at + 20 C for pressureless applications only Temperature range 20 C to + 80 C Mounting orientation EMC vertical or horizontal, depending on application and medium for interference emission in accordance with the appliance-specific requirements for households, business and commerce as well as small companies, and for interference immunity in accordance with the appliance-specific requirements for industrial companies

5 CNI 1 /2 /PP CNI 1 /2 /PVDF CNI 1 /2 /PTFE ~ M 20 x 1.5 ~ 117 SW 41 G 1 /2 60 Ø

6 Capacitive proximity switches with screw-in nipple G1 short version Technical data CNS 1 /PP/K CNS 1 /PVDF/K CNS 1 /PTFE/K Mode of operation: NO contact CNS 1 /PP/K-S CNS 1 /PVDF/K-S CNS 1 /PTFE/K-S NC contact CNS 1 /PP/K-O CNS 1 /PVDF/K-O CNS 1 /PTFE/K-O All parts in contact with the liquid / the pourable bulk good PP PVDF PTFE Screw-in nipple Length of sensor tube, measured from the nipple sealing surface G1 approx. 60 mm, up to 200 mm on request Connection head PP with cable entry M 20 x 1.5, protection class IP 54 Electrical design DC, 2-wire design Voltage range DC 4 V to DC 24 V, preferably to NAMUR: DC 8.2 V (with R i =1 kω) Power input at an operating voltage of U = DC 8.2 V (with R i = 1 kω) Activation distance NO contact: inactive < 1 ma (LED in connection head dark), active > 3 ma (LED in connection head lights red) NC contact: inactive > 3 ma (LED in connection head lights red), active < 1 ma (LED in connection head dark) adjustable in the connection head via multiturn potentiometer between 0 and approx. 25 mm Self-inductance approx. 0 Self-capacitance approx. 100 nf Pressure resistance max. 2 bar at + 20 C for pressureless applications only Temperature range 20 C to + 80 C Mounting orientation EMC vertical or horizontal, depending on application and medium for interference emission in accordance with the appliance-specific requirements for households, business and commerce as well as small companies, and for interference immunity in accordance with the appliance-specific requirements for industrial companies

7 CNS 1 /PP/K CNS 1 /PVDF/K CNS 1 /PTFE/K ~ M 20 x 1.5 ~ 117 SW 41 G1 60 Ø

8 Capacitive proximity switches with screw-in nipple G1 long version Technical data CNS 1 /PP/L CNS 1 /PVDF/L Mode of operation: NO contact CNS 1 /PP/L-S CNS 1 /PVDF/L-S NC contact CNS 1 /PP/L-O CNS 1 /PVDF/L-O All parts in contact with the liquid / the pourable bulk good PP PVDF Screw-in nipple G1; on request: G1 1 /4, G1 1 /2 or G2; on request: height-adjustable (same dimensions) Length of sensor tube, measured from the nipple sealing surface between 200 and approx. 1,500 mm, according to customer specifications Connection head PP with cable entry M 20 x 1.5, protection class IP 54 Electrical design DC, 2-wire design Voltage range DC 4 V to DC 24 V, preferably to NAMUR: DC 8.2 V (with R i =1 kω) Power input at an operating voltage of U = DC 8.2 V (with R i = 1 kω) Activation distance NO contact: inactive < 1 ma (LED in connection head dark), active > 3 ma (LED in connection head lights red) NC contact: inactive > 3 ma (LED in connection head lights red), active < 1 ma (LED in connection head dark) adjustable in the connection head via multiturn potentiometer between 0 and approx. 25 mm; on request up to max. 50 mm (please note that the sensitivity to interference increases with activation distance) Self-inductance approx. 0 Self-capacitance approx. 100 nf Pressure resistance max. 2 bar at + 20 C Temperature range 20 C to + 80 C Mounting orientation EMC vertical for interference emission in accordance with the appliance-specific requirements for households, business and commerce as well as small companies, and for interference immunity in accordance with the appliance-specific requirements for industrial companies

9 ~ M 20 x 1.5 ~ 117 SW 41 G1 CNS 1 /PP/L or CNS 1 /PVDF/L acc. to customer specifications between 200 and 1,500 Ø

10 Technical data CNS-HN Mode of operation: - NO contact CNS-HN-S - NC contact CNS-HN-O Sensor housing PP; other materials (e. g. PVDF or PTFE) on request, protection class IP 68 Connecting cable oil-resistant PVC cable 2 x 0.75 (temperature range: 0 C to + 60 C) on request: silicone cable 2 x 0.75 (temperature range: 15 C to + 70 C) CM cable 2 x 0.75 (temperature range: 5 C to + 70 C) other connecting cable (e. g. FEP or PTFE) on request (temperature range: on request) Length of connecting cable 2 metres; longer connecting cable on request Mounting accesssories (optional) stuffing boxes G1, G1 1 /4, G1 1 /2 or G2 made of PP, brass, stainless steel 316 Ti, PVDF etc. connection boxes made of PP, 120 x 80 x 55 mm, with integrated stuffing box Electrical design DC, 2-wire design Voltage range DC 4 V to DC 24 V, preferably to NAMUR: DC 8.2 V (with R i = 1 kω) Power input at an operating voltage of U = DC 8.2 V (with R i = 1 kω) Activation distance Capacitive proximity switch in suspended proximity sensor design Mounting possible through bushing or hole of G1 NO contact: inactive < 1 ma, active > 3 ma NC contact: inactive > 3 ma, active < 1 ma approx. 0 to 10 mm, depending on dielectricity constant of liquid or bulk good; on request up to max. 50 mm (please note that sensitivity to interference increases with activation distance) When ordering, please state the medium in which the proximity switch is to be used so that we can adjust the sensitivity accordingly. Self-inductance approx. 0 Self-capacitance approx. 100 nf Pressure resistance max. 2 bar at + 20 C Temperature range depending on the connecting cable (see above) Mounting orientation vertical, freely suspended from the connecting cable EMC for interference emission in accordance with the appliance-specific requirements for households, business and commerce as well as small companies, and for interference immunity in accordance with the appliance-specific requirements for industrial companies.

11 CNS-HN ~ Ø

12 Technical data CSG 11 A CSG 11 R Mode of operation working current design quiescent current design (LED lights when (LED lights when relay is energised) relay is not energised) Alternative supply voltages (AC versions: AC 230 V (delivered if no other supply voltage is specified terminals 15 and 16; in the order) or DC versions: AC 240 V or - terminal 15:, AC 115 V or - terminal 16: +) AC 24 V or DC 24 Vor in these two cases, the unit must only be DC 12 V or } connected to a low safety voltage which corresponds to the safety regulations relating to the application further supply voltages on request Power input approx. 3 VA Control circuit (terminals 6, 7, 8) according to NAMUR, 3 terminals (under safety extra low voltage SELV), acting on 1 output relay with self-hold Response hysteresis switching ON point > ~ 1.8 ma switching ON point < ~ 1.5 ma switching OFF point < ~ 1.5 ma switching OFF point > ~ 1.8 ma No-load voltage approx. DC 8.2 V (safety extra low voltage SELV) Short circuit current < 10 ma Controlled circuit (terminals 9, 10, 11) 1 single-pole potential-free changeover contact Switching voltage max. AC 250 V Switching current max. AC 4 A Switching capacity max. 500 VA Connection of sensor(s) with connection of 1 proximity sensor at terminals 7 and 8 and without bridge between terminals 6 and 8: without self-hold with self-hold with connection of 1 proximity sensor at terminals 7 and 8 and with bridge between terminals 6 and 8: with self-hold without self-hold with connection of 2 proximity sensors for two-point control at terminals 6 and 8 and 7 and 8 (see connection diagrams): with self-hold with self-hold Housing insulating material, 75 x 55 x 110 mm Connection terminals on top of housing Protection class IP 20 Mounting clip attachment for U-bar to DIN and EN or fastening via two boreholes Mounting orientation any Temperature range 20 C to + 60 C EMC Capacitive switching devices CSG 11 A and CSG 11 R for signalling 1 limit level or for 1 two-point control for interference emission in accordance with the appliancespecific requirements for households, business and commerce as well as small companies, and for interference immunity in accordance with the appliance-specific requirements for industrial companies.

13 Switching statuses of the CSG 11 A / CSG 11 R switching devices Power input Operating status Switching status Switching status of sensor of CSG 11 A of CSG 11 R I = 0 Mains failure Output relay Output relay not energised, not energised, LED off LED off, alarm I = 0 Sensor cable break Output relay Output relay not energised, not energised, LED off LED on, alarm I < 1 ma Sensor NO contact Output relay Output relay not activated / not energised, not energised, sensor NC contact activated LED off, OK status LED on, alarm I > 3 ma Sensor NO contact Output relay Output relay activated / energised, energised, sensor NC contact not activated LED on, alarm LED off, OK status I = Ik Sensor cable Output relay Output relay (short circuit short circuit energised, energised, current) LED on, alarm LED off I Ik Sensor incorrectly Output relay Output relay (short circuit wired energised, energised, current) LED on, LED off alarm The appliances are designed for switch cabinet installation or mounting in an appropriate protective housing and may therefore not be installed in other locations. They are only suitable for use in clean environments. Rating plates of the CSG 11 A and CSG 11 R switching devices Output contact shown in no-current condition

14 Connection diagrams 2-point control with CSG 11 A Function Emptying : NO contact (control circuit) Function Filling : NC contact (holding circuit) NO contact (holding circuit) P CSG 11 A NC contact +L (control circuit) +L P CSG 11 A Source of errors Cable break Short circuit In the holding circuit Pump only runs until: Pump is not switched off top probe is free (in Emptying mode) bottom probe is covered (in Filling mode) In the control circuit Pump cannot switch on Pump runs continuously Equivalent circuit diagram for CSG 11 A Self-hold Output relay not energised: LED dark If CNI/CNS closed: output relay energised + LED lit If self-hold via bridge or if the second CNI/CNS is closed, this switching status remains even if the first CNI/CNS opens again LED dark: output relay not energised, CNI/CNS open LED lit: output relay energised, CNI/CNS closed or output relay in self-hold

15 Connection diagrams 2-point control with CSG 11 R Function Emptying : NC contact (control circuit) Function Filling : NO contact (holding circuit) NC contact (holding circuit) CSG 11 R CSG 11 R L NO contact (control circuit) +L P P Source of errors Cable break Short circuit In the holding circuit Pump is not switched off Pump only runs until: top probe is free (in Emptying mode) bottom probe is covered (in Filling mode) In the control circuit Pump runs continuously Pump cannot switch on Equivalent circuit diagram for CSG 11 R Self-hold Output relay not energised: LED lit If self-hold + CNI/CNS closed: output relay energised + LED dark If self-hold + CNI/CNS open: output relay not energised + LED lit; this switching status remains even if CNI/CNS closes again LED lit: output relay not energised, CNI/CNS open or output relay in self-hold LED dark: output relay energised, CNI/CNS closed

16 Application examples for CSG 11 A and CSG 11 R CSG 11 A for signalling 1 limit level CSG 11 R for signalling 1 limit level /2010