Limit switches for Dial Thermometers and Pressure gauges

JJ Direct limit switches JJ Indirect limit switches JJ Multifunction relays Limit switches for Dial Thermometers and Pressure gauges DS_Limit_switches 08/2015 349

Limit switches Limit switches are optional available for some types of our dial thermometers and pressure gauges with nominal sizes 100 and 160 mm. They are opening or closing connected electric circuits at the preset limits. Measuring instruments with limit switches are factory-supplied as a complete unit. The application and function of our limit switches are explained in this catalogue. Detailed information is provided on the selection, switching functions and minimum measuring spans, operating conditions, technical data and options. Limit switches close or open electrical circuits. Using a removable key, the reference pointer is set to the value at which the switching procedure is to be carried out. The actual value pointer can continue working beyond the reference point pointer following a successful limit signal output. The reference value pointers can be adjusted across the entire scale range. The specifications of DIN 16 085 (pressure gauges) and DIN 16 196 (thermometers) apply to limit switches with 1 and 2 contacts. We also provide limit switches with 3 or 4 contacts. Special adjustments are required here with regard to setting ranges, switching hysteresis and the possibility of the pointers overlapping. We distinguish between the following types: Direct limit switches Slow-action contact Magnetic contact Indirect limit switches Electronic sensors Inductive sensors S M E I 350

Setting ranges of the limit switches The standards DIN 16 085 (pressure gauges) and DIN 16 196 (thermometers) apply in conjunction with the equipment standards DIN EN 831-1/-3 (pressure gauges) and DIN EN 13 190 (thermometers). As pressure gauges/thermometers with limit switches are subject to other forces, the range within which limit switches should ideally operate and are factory adjusted, is specified as follows in accordance with the standards: 2 4 2 4 2 4 0 8 0 8 0 8 Limit switches with 1 contact Setting ranges: S / E / I contact 10-90 % M contact 15-85 % Limit switches with 2 contacts Setting range S / E / I contacts both contacts: 10-90 % Limit switches with 2 contacts Setting range M - contacts 1. contact: 15-70 % 2. contact: 30-85 % Outside of the specified ranges, larger switching accuracies and a larger or smaller switching pressure reversal span should be expected, amongst other things. Magnetic contacts are especially problematic, because any reduction of the magnetic forces during adjustment, for example, would make the specified maximum contact load no longer able to be fully exploited. It is generally not possible to combine a maximum contact load with a minimum of magnetic force. 4 1 2 3 1 Reference value pointer 2 Adjusting device 3 Actual value pointer 4 Key for adjusting device 351

Direct limit switches With standard contact Type S The device for signalling in the version with standard contacts consists of the adjustable reference value pointer, connected with the carrier arm that carries a contact pin and the contact arm that is moved by the actual value pointer, on which the second contact pin is situated. If the actual value pointer and the reference value pointer are on top of each other, then the switching procedure occurs. The contact pins touch or are separated. The torque which acts on the actual value pointer is low, so that the contacts switch exactly to the set reference value. Standard contacts are suitable for: Vibrationless attachment and applications without pulsations, since otherwise unintentional switches may occur. Non-aggressive atmospheres, so that the contact surfaces do not pollute or oxydise. Devices without filled case Use of relays Pulse-controlled multifunction relays from the MSR series Ensure increased switching reliability and enable a higher switching frequency, which can be negatively affected by external influences such as aggressive atmospheres, pollution or oxidation of the contact surfaces. Reduce the contact load Reduce unintentional switching operations caused by vibration / pulsation due to an integrated dropout delay of 450 ms. Switching function 1 Contact Standard contact S Breaking S2 Making S1 Single changeover contact Standard contact S S3 2 Contacts* Standard contact S 1st and 2nd breaking S22 1st breaking and 2nd making S21 1st and 2nd making S11 1st making, 2nd breaking S12 * Arrangement of contacts clockwise 352

Technical data Type S Installation in casing Ø (NS) Electrical data Nominal insulation voltage Nominal operating voltage Nominal operating current Making / breaking current Switching capacity Measuring system Switching pressure reversal span Switching accuracy Ambient temperature Contact material Filled case CE mark 100, 160 mm 250 V 230 V AC (mains) Max. 0.6 A Max. 0.7 A 10 W / 18 VA Recommended contact load for devices without filled case for ohmic and inductive load Recommended voltage in accordance with DIN IEC 60 038 DC 220 V 110 V 48 V 24 V AC 230 V 110 V 48 V 24 V DC 40 ma 80 ma 120 ma 200 ma Minimum values for contact load Rated operating voltage U etf min. Switching capacity (DC, AC) Options accuracy class 1.5 x accuracy class -20...70 C Silver nickel, 10μ gold-plated (AG80NI20AU10μ) Limit switches with standard contacts can only be used for devices without filled case: Measuring devices with limit switches with standard contacts carry the CE mark for compliance with electromagnetic compatibility and low-voltage requirements. 24 V 0.4 W More than 2 contacts, specifications on the ability of the reference value pointer to overlap Separate circuits Double changeover contact S33 Open-circuit monitoring (parallel connected resistor per contact) on request AC 45 ma 90 ma 170 ma 350 ma cosφ>0.7 25 ma 45 ma 70 ma 100 ma Minimum measuring spans Measuring device NS [mm] Number of contacts 1 2 3 4 Bourdon tube pressure gauge NS 100 NS 160 Diaphragm pressure gauge NS 100, flange-ø 160 NS 100, flange-ø 100 NS 160, flange-ø 160 NS 160, flange-ø 100 1.0 bar 1.0 bar 60 mbar 60 mbar 1.6 bar 1.6 bar 100 mbar 100 mbar 160 mbar 160 mbar Dial thermometers NS 100, 160 No minimum measuring span for standard display ranges 160 mbar 160 mbar 353

With magnetic contact Type M Limit switches with magnetic contacts have a screwable permanent magnet attached to the carrier arm of the reference value pointer; locking varnish is applied to the permanent magnet. This increases the contact pressure and also protects the contacts against burning as a result of electric arc effects. The magnet accelerates contact making and delays contact separation. Depending on the directional force of the measuring element and the set magnetic force, the characteristic can be 2 to 5 % of the measuring range. Magnetic contacts can be used almost everywhere as they are largely insensitive to vibrations. Switching reliability, switching capacity and contact load are considerably higher than with standard contacts. Use of relays Pulse-controlled multifunction relays from the MSR series Ensure increased switching reliability and enable a higher switching frequency, which can be negatively affected by external influences such as aggressive atmospheres, pollution or oxidation of the contact surfaces. For use with devices with filled case. Reduced risk of oil contamination from electric arcs. Fewer unintentional switching operations caused by vibration / pulsation due to an integrated dropout delay of 450 ms. Reduced contact load Switching function 1 Contact Magnetic contact M Breaking M2 Making M1 Single-changeover-contact Magnetic contact M M3 2 Contacts* Magnetic contact M 1st and 2nd breaking M22 1st breaking, 2nd making M21 1st and 2nd making M11 1st making, 2nd breaking M12 * Arrangement of contacts clockwise 354

Technical data Type M Installation in casing Ø (NS) 100, 160 mm Electrical data Unfilled case with filled case Nominal insulation voltage Nominal operating voltage Nominal operating power Making/breaking current Switching capacity Measuring system Switching pressure reversal span Switching accuracy Ambient temperature Contact material Filled case CE mark Recommended contact load for devices without filled case for ohmic and inductive load Recommended voltage in accordance with DIN IEC 60 038 DC 220 V 110 V 48 V 24 V AC 230 V 110 V 48 V 24 V DC 100 ma 200 ma 300 ma 400 ma Minimum values for contact load Rated operating voltage U etf min. Switching capacity (DC, AC) Options 250 V 230 V AC (mains) Max. 0.6 A max. 90 ma Max. 1.0 A 30 W / 50 VA 20 W / 20 VA Accuracy class + 2-5 % of the measuring range 1.5 x accuracy class -20...70 C Silver nickel, 10μ gold-plated (AG80NI20AU10μ) Limit switches with magnetic contacts, when using an MSR series contact protection relay, are suitable to a limited extent for devices with filled case Measuring devices with limit switches with magnetic contacts carry the CE mark for compliance with electromagnetic compatibility and low-voltage requirements. 24 V 0.4 W More than 2 contacts, specifications on the ability of the reference value pointer to overlap Separate circuits Double changeover contact M33 Open-circuit monitoring (parallel connected resistor per contact) AC 120 ma 240 ma 450 ma 600 ma cosφ>0,7 65 ma 130 ma 200 ma 250 ma Minimum measuring spans Measuring device NS [mm] Number of contacts 1 2 3 4 Bourdon tube pressure gauge NS 100 NS 160 Diaphragm pressure gauge NS 100, flange Ø 160 NS 100, flange Ø 100 NS 160, flange Ø 160 NS 160, flange Ø 100 1.6 bar 1.6 bar 100 mbar 100 mbar 160 mbar 160 mbar 4 bar 4 bar 250 mbar 250 mbar Dial thermometers NS 100, 160 No minimum measuring span for standard display ranges 4 bar 250 mbar 250 mbar 355

Indirect limit switches With electronic contact Type E The signalling arrangement of limit switches with electronic contact consists of contain a proximity switch with integrated switching amplifiers (PNP output) and a control lug. The proximity switch is attached to a carrier arm, which is connected to the reference value. The control lug is moved by the actual value pointer. When the control lug enters the proximity switch, the circuit is closed. When the control flag leaves the proximity switch, the circuit is opened. Switching takes place when the control lug is located in the centre of the proximity switch. The torque acting on the actual value pointer with the control lug is low, so that switching takes place precisely at the set reference value. Electronic contact are suitable for industrial use. Less sensitive for unintentional switching operations due to vibrations / pulsation. Wear and corrosion-free (all electrical components are encapsulated watertight in casting resin in a plastic housing). PLC, opto-couplers or other electronic evaluation units with low voltages and currents can be directly controlled as the proximity switch is a 3-wire type with PNP switching input. Switching function 1 Contact Electronics E Breaking Making 2 Contacts* Electronics E 1st and 2nd breaking 3 3 3 4 2 1 2 1 2 1 E2 E1 E22 1st breaking, 2nd making E21 3 4 2 1 1st and 2nd making E11 3 4 2 1 1st making, 2nd breaking E12 3 4 2 1 * Arrangement of contacts clockwise 356

Technical data Type E Installation in casing Ø (NS) Electrical data Nominal operating voltage Switching capacity Measuring system Switching pressure reversal span Switching accuracy Ambient temperature Contact material Filled case CE mark 100, 160 mm 10...30 V DC 100 ma Options More than 2 contacts, specifications on the ability of the reference value pointer to overlap PNP switching output as a 2-wire connection on request accuracy class 1.5 x accuracy class -25...70 C Silver nickel, 10μ gold-plated (AG80NI20AU10μ) Limit switches with electronic contacts can be used in devices with filled case. Measuring devices with limit switches with electronic contacts carry the CE mark for compliance with electromagnetic compatibility requirements. Minimum measuring spans Measuring device NS [mm] Number of contacts 1 2 3 4 Bourdon tube pressure gauge NS 100 NS 160 Diaphragm pressure gauge Flange Ø 100 Flange Ø 160 1.0 bar 1.0 bar 60 mbar 1.6 bar 1.6 bar 60 mbar 60 mbar Dial thermometers NS 100, 160 No minimum measuring span for standard display ranges 357

With inductive contact Type I The version with inductive sensors consists of a proximity switch (displacement sensor according to DIN EN 60 947-5-6 (NAMUR), a control lug and MSR-I series multifunction relay (use in locations not subject to explosion hazards). Multifunction relays are not included in the scope of delivery of a device with inductive contacts. The displacement sensor is attached to a carrier arm, which is connected to the reference value pointer. The control lug is moved by the actual value pointer. In principle, the proximity switch is a transistor-oscillator whose moving coils are arranged to both sides of the proximity switch. Switching takes place precisely at the set reference value as the torque acting on the actual value pointer is low. Inductive sensors in combination with our MSR-I series multifunction relays are suitable for every industrial use. Wear and corrosion-free (all electrical components are encapsulated watertight in casting resin in a plastic housing). Proximity switches can be used up to SIL 2 in accordance with IEC 61 508. Switching function 1 Contact Induktive I Breaking Making 2 Contacts* Induktive I 1st and 2nd breaking I2 I1 I22 Relays Pulse-controlled multifunction relays from the MSR-I series For applications where no explosion protection is required Reduce unintentional switching operations / pulsation due to an integrated switching delay of 450 ms. 1st breaking, 2nd making 1st and 2nd making 1st making, 2nd breaking I21 I11 I12 * Arrangement of contacts clockwise 358

Technical data Type I Installation in casing Ø (NS) Electrical data Nominal operating voltage Switching capacity Measuring system Switching pressure reversal span Switching accuracy Ambient temperature Contact material Filled case CE mark 100, 160 mm 5...25 V DC Max. 3 ma accuracy class 1.5 x accuracy class -20...70 C Limit switches with inductive contacts can be used in devices with filled case. Measuring devices with limit switches with inductive contacts carry the CE mark. Options More than 2 contacts, data on the ability of the reference value pointer to overlap on request NS 160 with 2 contacts in interval switching mode, completely reaction-free operation, particularly suitable for class 0.6 precision pressure gauges. On this special design, the control flag is on the actual value pointer. Minimum measuring ranges Measuring device NS [mm] Measurement unit Bourdon tube pressure gauge NS 100 NS 160 Diaphragm pressure gauge Flange Ø 100 Flange Ø 160 bar bar mbar bar Number of contacts 1 2 3 4 1.0 bar 1.0 bar 60 mbar 1.6 bar 1.6 bar 60 mbar 60 mbar Dial thermometers NS 100, 160 C No minimum measuring span for standard display ranges 359

Multifunction relays For limit switches with standard and magnetic contact or inductive contact Our multifunction relays for mechanical contacts enable virtually load-free contact switching due to pulsed control signals with a mark-to-space ratio of 1:100. In addition, they allow barrier layers to be overcome due to pulse voltages up to 40 V with a rate of rise of typically 120 V/μs. Using a dropout delay of typically 0.4 seconds (changes possible on request), uncontrollable erroneous switching caused by bounces or other vibrations is reduced. In addition, the use of our multifunction relays enables a higher switching capacity of the contact thanks to a downstream relay with floating changeover contact. Inductive sensors are suitable for industrial uses. They switch contactless, have a high switching accuracy and a long service life. For this reason, they are increasingly used in industrial plants for which explosive protection or Ex zone 2 is not required. We can provide cost-effective MSR-I relays, as expensive PTB-approved isolating amplifiers are unnecessary for this application. 360

Requirements Multifunction relays are built-in devices for use in closed electrical operating areas. Only electrically qualified or skilled persons may carry out installation. Defects resulting improper handling are not covered by the warranty. Multifunction relays comply with the following requirements: EN 50178 Electrical safety The following versions are available MSR 010 Monostable version for connection of a single contact: limit switch types S-1 / M-1 or S-2 / M-2. MSR 020 Monostable version for the connection of a double contact or two single contacts: limit switch types S-1 / M-1 to S-22 / M-22. EN 61000-6-2 Noise immunity EN 61000-6-3 Emitted interference EN 60947-5-1 Low-voltage switching devices MSR 010-I Switching amplifier for the connection of a single inductive sensor: limit switch types I-1 or I-2. MSR 020-I Switching amplifier for the connection of a double inductive contact or two single inductive contacts: limit switch types I-1 to I-22. 361

Multifunction relays For contacts with standard and magnetic contact Type MSR 020 The MSR 010 series is suitable for the connection of single contacts and the MSR 020 series for the connection of a double or two single contacts. Contact protection relays increase the switching reliability and capacity of electromechanical limit switches and reduce the contact load. Unintentional switching operations caused by vibrations or contact bounce of slow-action contacts are significantly reduced by a dropout delay. Multifunction relays are recommended for use in oils. Connection example for MSR 010 (Fig. 1) The multifunction relay is supplied with voltage via terminals A1 and A2. On connection of supply voltage (the connected limit switch is not actuated, contact 1-4 open), the floating changeover contact of the MSR relay is in a release state (see type plate). When the limit switch is actuated (contact 1-4 closed), the changeover contacts close. The floating changeover contact of the MSR relay returns to the release state when the supply voltage is interrupted. Fig. 1 Fig. 2 Power supply 230 V AC 50/60 Hz N L Limit switch Type I-11 1 4 Power supply 230 V AC 50/60 Hz N L Limit switch Type I-11 1 2 4 Connection example for MSR 020 (Fig. 2) The multifunction relay is supplied with voltage via terminals A1 and A2. On connection of supply voltage (the connected limit switch is not actuated, contact 1-4 or 2-4 open), the floating changeover contact of the MSR relay is in a release state (see type plate). When the limit switch is actuated (contact 1-4 or 2-4), the changeover contacts close. The floating changeover contact of the MSR relay returns to the release state when the supply voltage is interrupted. 362

Technical data MSR 010 MSR 020 Power supply Rated voltage Ue Power consumption 230 V AC 50-60 Hz -10...6 % available on request in the following voltages 115 V AC 50-60 Hz -10...6 % 24 V AC 50-60 Hz -10...6 % 24 V DC -10...15 % Typically 6 VA (1.5 VA / W)* Control signals Control voltage Mark-to-space ratio Switching threshold Input impedance Power and contact resistance 35-40 V DC Pulse (24 V DC Pulse)* 0.5 ms / 50 ms ±20 % 9.7 V DC ±10 % 3.3 kω, 100 nf ±20 % Max. 4.7 kω, 47 nf (3.0 kω, 47 nf)* Outlets 1 relay (floating changeover contact) 2 relays (floating changeover contact) Output / dropout delay Contact material Switching capacity Rated operational current le Short-circuit protection device Max. short-circuit current Voltage output Output power Max. short-circuit current Area of application Rated insulation voltage Overvoltage category Pollution severity EN 50178 Degree of protection EN 60529 Temperature range Housing material *Details relate to power supply / rated voltage 24 V AC / DC 10 ms / 450 ms ±20 % +50 ms AgCdO bzw. AgNi+Au Max. 250 V AC / 8 A Min. 24 V DC / 0.1 A According to utilisation category AC 1 250 V / 8 A AC 13 250 V / 3 A DC 1 250 V / 0.3 A DC 13 250 V / 0.1 A F 10 A < 100 A Only for external devices, e.g. sensor supply or LED displays 24 V DC ±10 % l max. 20 ma Conditionally short-circuit-proof 250 V AC III 2 IP20 0...70 C Polyamide 6.6, red / black 10 ms / 450 ms ±20 % +50 ms AgCdO bzw. AgNi+Au Max. 250 V AC / 8 A Min. 24 V DC / 0.1 A According to utilisation category AC 1 250 V / 8 A AC 13 250 V / 3 A DC 1 250 V / 0.3 A DC 13 250 V / 0.1 A F 10 A < 100 A Several relays (including MSR 010 and MSR 020 combined) can be connected on request. A control output (terminal 12 or 22) can drive a maximum of 4 control inputs (terminal 13 or 23). The permitted contact resistance is reduced in this case for each signal input to max. 2kΩ (1kΩ for auxiliary power 24 V AC / DC). A bridge between the control outputs is not necessary. If a control output drives the control inputs of several MSR relays, then a uniform reference potential must be ensured. Terminals 82 of the MSR relays must be connected in this case. 363

For contacts with inductive contact Type MSR 020-I The MSR 010-I series is suitable for the connection of single inductive contacts and the MSR 020-I series for the connection of double inductive contacts. Both types are suitable for areas in which expensive PTB-approved isolating switching amplifiers are not required. Unintentional switching operations caused by vibration are significantly reduced due to a drop-out delay. Connection example for MSR 010-I (Fig. 1) The multifunction relay is supplied with voltage via terminals A1 and A2. On connection of the supply voltage (the connected sensor is not actuated, proximity switch 1-2 actuated), the floating changeover contact of the MSR-I relay is in a release state (see type plate). When the limit switch is actuated (proximity switch 1-2 not actuated), the changeover contacts close. The floating changeover contact of the MSR-I relay returns to the release state when the supply voltage or proximity switch circuit is interrupted. Fig. 1 Fig. 2 Power supply 230 V AC 50/60 Hz N L Limit switch Type I-1 1 2 Power supply 230 V AC 50/60 Hz N L Limit switch Type I-11 1 2 3 4 Connection example for MSR 020-I (Fig. 2) The multifunction relay is supplied with voltage via terminals A1 and A2. On connection of supply voltage (the connected limit switch is not actuated, proximity switch 1-2 or 3-4 actuated), the floating changeover contacts I and II of the MSR-I relay are in a release state (see type plate). By activating the limit switch (proximity switch 1-2 or 3-4 not attenuated), the contacts on changer I and II are closed. When the supply voltage or proximity switch circuit is interrupted, the floating changeover contact of the MSR-I relay returns to the release state. 364

Technical data MSR 010-I MSR 020-I Power supply Rated voltage Ue 230 V AC 50-60 Hz -10...6 % available on request in the following voltages 115 V AC 50-60 Hz -10...6 % 24 V AC 50-60 Hz -10...6 % 24 V DC -10...15 % Power consumption Typically 6 VA (1.5 VA / W)* Control signals Open-circuit voltage Short-circuit Current Switching Threshold Terminating 10 V DC ±10 % 4.5 ma ±10 % 1.8 ma ±10 % 2.2 kω, 100 nf ±20 % Outputs 1 relay (floating changeover contact) 2 relays (floating changeover contact) Output / dropout delay Contact material Switching capacity Rated operational current le Short-circuit protection device Max. short-circuit current Voltage output Output power Max. short-circuit current Area of application Rated insulation voltage Overvoltage category Pollution severity EN 50178 Degree of protection EN 60529 Temperature range Housing material *Details relate to power supply / rated voltage 24 V AC / DC 10 ms / 20 ms ±20 % +50 ms AgCdO bzw. AgNi+Au Max. 250 V AC / 8 A Min. 24 V DC / 0.1 A According to utilisation category AC 1 250 V / 8 A AC 13 250 V / 3 A DC 1 250 V / 0.3 A DC 13 250 V / 0.1 A F 10 A < 100 A Only for external devices, e.g. sensor supply or LED displays 24 V DC ±10 % l max. 20 ma Conditionally short-circuit-proof 250 V AC III 2 IP20 0...70 C Polyamide 6.6, red / black 10 ms / 20 ms ±20 % +50 ms AgCdO bzw. AgNi+Au Max. 250 V AC / 8 A Min. 24 V DC / 0.1 A According to utilisation category AC 1 250 V / 8 A AC 13 250 V / 3 A DC 1 250 V / 0.3 A DC 13 250 V / 0.1 A F 10 A < 100 A 365