MEGGITT MOBREY LTD MOBREY SQUING Vibrating fork liquid level switch Universal level switch High level alarm duty Overfilling prevention Intrinsically safe models Marine approved models FEATURES Small & compact No moving parts Resistant to plant vibration Operates in most liquids Large range of mounting options Hastelloy C and ECTFE coated models Hygienic fittings Product data sheet IP202 OPERATION The MOBREY Squing is a two wire device and may be installed in any position in a pipe or vessel to detect the presence of a liquid. Squing has a tuning fork style wetside which vibrates at its natural frequency when in air. A piezoelectric crystal system is used to create the oscillations and to monitor the actual frequency of oscillation. When the fork is covered by a liquid, this frequency changes and is detected by the electronics which change the output state of Squing. Standard two core cable is used to connect Squing in series with the load. The solid state output stage acts as a simple SPST switch, operated by liquid presence. Squing may also be interfaced directly to a PLC using the PNP transistor output model. IS Squing interfaces directly to proprietary NAMUR isolation amplifiers, resulting in the lowest cost IS system on the market. SPECIAL FEATURES Squing has a status indicating LED which can be seen at all times through a lens in the end cover. The LED will flash approximately once per second when Squing is "off" and will be constantly lit when Squing is "on". The LED gives an indication that Squing is functioning correctly and of course gives a visual indication of the state of the wetside. A 'mode' switch on the circuit board is provided for the user to select either Squing on when dry - the normal condition - or on when wet, as would be selected for low level duties. HIGH LEVEL DUTY The fact that Squing is vibrating normally when dry makes it ideal for use in high level detection applications. Any change in frequency, however caused, will turn Squing off and an alarm may be activated. When included in a fail-safe circuit, Squing provides an extra degree of fail safety improving system integrity. Squing is approved by both PTB and DIBT for overfilling prevention duties.
SWITCHING OPTIONS Direct load switching Module code 0 Load 0V +V Simply wire the load in series Max. switched load: 500mA continuous Max. peak load: 5A for 40ms maximum Min switched load: 7.5mA continuous Current drawn (load off): <2.0mA continuous Approximate voltage drop: 6.5V @ 24V dc / 5.0V @ 240V ac Operating voltage: 24 to 240V (+/-10%) dc or ac E Always earth Squing using this terminal PLC switching (PNP output) Module code 1 24V dc Sig 0 PLC Supply voltage from PLC: Signal to PLC: 24Vdc 24V dc ON / 0V dc OFF Relay output Module code 2 +V Operating voltage: 24V dc +/-20% NC NO C 0V Contact rating: Max. relay voltage: 5A at 30V dc resistive 2A at 30V dc L / R = 7ms 30V dc E Always earth Squing using this terminal Squing : intrinsically safe models for hazardous area use Squing models with CENELEC approval can be installed in a hazardous area. These models conform to the DIN 19234 (NAMUR) switching levels, drawing <1.2mA on the two wire loop when 'off' and >2.1mA when 'on'. An interface unit, mounted in the safe area, powers and monitors the loop and provides relay or solid state outputs for control purposes. Such devices are proprietary items and are available fully certified EExia IIc from Mobrey or from local stockists. These devices often include a 'fault detection' circuit, which is activated when Squing draws a current outside the acceptable window, such as on open or short circuit conditions in the wiring. I.S. Squing HAZARDOUS AREA Amplifier I.S. supply to Squing Certified isolating amplifier DIN19234 / NAMUR SAFE AREA Safe area Switching output Power supply As an extra safety feature, I.S. Squing contains circuitry to detect an abnormal rise in operating frequency, such as would be caused by wetside corrosion. When installed as a high level or overfilling alarm in vessels containing corrosive liquids or vapours, this feature causes the I.S. Squing to switch to the alarm state, indicating a wetside corrosion problem. Suitable isolating amplifiers MTL: 2213, 5011, 5012, 5014, 5016 ABB: GHG Series STAHL: 9250 & 9251 Series P&F: KHD2 & KHA5/6 Series If in doubt, contact Mobrey or isolation amplifier manufacturer for full details.
MOUNTING OPTIONS Threaded mounting Standard threads ¾", 1" BSPT, BSPP, NPT Max. op. press. 50b (-40 to +50 o C) 45b (at 130 o C) Max. op. temp. +130 o C wetside (150 o C CIP for 30 mins) Min. op. temp. -40 o C wetside/dryside Max. amb. temp. +50 o C (at 130 C wetside) Notes: Max. length E = 3000mm. Extended models with 1" thread only. State dim. E & A when ordering. Overall length E = A + 13mm Options: For use with corrosive liquids which do not form condensing vapours, Squing is available with just the forks and short length of the extension tube - 100mm in all - coated with Halar. Accessories: For use with extended length Squing (1" models only), an adjustable clamp is available. This is threaded 1½" BSPP for connection to the vessel, and allows the extended length Squing to be raised or lowered then clamped in position. Note: this limits max. operating pressure to 1.3bar (SK304) Flange mounting Standard flanges ANSI, DIN, Mobrey (see ordering codes overleaf) Max. op. press. 50b (-40 to +50 o C) 45b (at 130 o C) or flange rating, whichever is the lower. Max. op. temp. Min. op. temp. Max. amb. temp. +130 o C wetside (150 o C CIP for 30 mins) -40 o C wetside/dryside +50 o C (at 130 C wetside) Notes: Max. length E = 3000mm. State dim. E & A when ordering. Overall length E = A + 13mm 1" thread only Ø28mm 102mm Std length 207mm over * Nominal switching point, vertically mounted Cable 112mm Customer defined length A over Cable ¾" or 1" thread 160mm Ø28mm * Nominal switching point, vertically mounted over Cable Customer defined length A over Cable 105mm Options: For use with corrosive liquids having condensing vapours, flanged Squing can be with the wetside fully Halar coated. maximum extended length E = 500mm. For liquids which do not form corrosive condensing vapours, Squing is available with jsut the forks and a short length of the extension tube - 100mm in all - coated with Halar. Hygienic Fitting Standard fittings Max. op. press. Max. op. temp. Min. op. temp. Max. amb. temp. Tri-Clover SMS DIN 11581 'O' Ring seal 30 bar +130 o C wetside (150 o C CIP for 30 mins) -40 o C wetside/dryside +50 o C (at 130 C wetside) Notes: Max. length E = 3000mm. State dim. E & A when ordering. Overall length E = A + 13mm Tri-clover shown 64mm 'O' ring seal Squing Ø32mm 82mm 20mm 160mm 172mm 1" BSPT Ø28.8mm over Cable over Cable Ø28mm over Cable Customer defined length A 96mm * Nominal switching point, vertically mounted Options: Hand polished wetside to a finish of 0.4 µm or better available to order Accessories: For use with 2"/51mm Tri-clover Squing, a mounting kit comprising vessel fitting, Viton seal and damp ring is available (SK266) For use with 'O' ring seal Squing, a fitting boss with Viton 'O' ring is available (SK267)
ORDERING INFORMATION Code Product 7 Squing Code Size Code Size 0 ¾ 6 3 1 4 7 DN50 2 DN65 8 DN80 3 1 & 'O' ring seal fitting 9 DN100 4 1.5 or 38mm A Mobrey A Flange 5 2 or 51mm G Mobrey G Flange Code Fitting Code 0 BSPT E Flange PN25 RF 4 BSPP Outside fitting F 'O' ring seal Hygienic fitting 5 NPT Outside fitting G Flange #300 RF 7 Tri-Clover clamp J Flange PN40 RF 9 SMS hygienic fitting K Flange #600 RF B Flange # 150 RF L Flange PN100 RF C Flange PN10/16 RF M Mobrey flange D DIN 11581 hygienic fitting (use with codes A & G above) Code Material TD 316 St. Steel TC Hastelloy C TX 316 St. Steel, Halar coated (500mm max. on extended length models) TY First 100mm from tip Halar coated Code Enclosure S G Yellow Squing housing Yellow GL approved housing Code Use 0 Safe area use only C F P CENELEC I.S. use DfBt Overfilling use PtB Zone 0 Overfilling use Code Output 0 Direct load switching (24-240V ac/dc) 1 PNP Transistor output 24v dc 2 Relay contacts 24v dc only Code Finish 0 Electropolish or glass bead on flanged/ extended length models P Polish to 0.4 um (500mm max. on extended length models) Code Material Certs : 0 Typical (on request only) 1 3.1B Certs. Code Length : E**** Extended length. (3000mm max.) 1" & flange only L Fixed length. A = 83mm M**** Modified standard product X**** Special product. 7 3 0 TD S 0 0 0 0 E2000 Typical part number
SPECIFICATION Construction Wetside Wetside surface finish Stainless steel 316 Hastelloy 'C' Electro polished or Glass bead shotblast on extended length models. Options : Halar (ECTFE) coating on flanged models. (500mm max) Hand polished to 0,4µm Dryside material Protection class Cable entry Operational Switching point Time delay / response (water) Switching hysteresis Viscosity Specific gravity Glass filled nylon IP66 / IP67 M16 cable ( 0 cable max) Pg11 cable on marine approved models Nominally 13mm from fork tip 1 S wet to dry / dry to wet (nominal) 4mm vertical, 1mm horizontal 5000cs max (at 25 C) (may increase response time) 0,6 min. APPROVALS Intrinsically safe CENELEC: EExia IIC T5 Overfilling prevention Safe area use Hazardous area use Zone 0 Marine approvals IS/Overfill & safe area BASEEFA Cert no. Ex94C2490 DIBt Cert. no. Z-65.11-30 DIBt Cert. no. Z-65.11-32 PtB Cert. no. 111B/S 2419F GL Cert. no. 99 164-96HH BASEEFA Deutsches Institut fur Bautechnik Physikalish-Technische Bundesanstalt Germanischer Lloyd ACCESSORIES Adjustable clamp Max. operating pressure: 1.3 bar Max. operating temp.: 125 o C SK304 For use with 1" thread extended length Squing. Manufactured from 316SS with a silicone rubber clamp seal. Allows Squing to be adjusted to optimum operating level and clamped in place. 42.5 ref. 56.0 A/F Thread ISO 228/1-G 1.5A (1½" BSPP) Tri-clover mounting kit Max. operating pressure: 30 bar Max. operating temp: 130 o C SK266 For use with Tri-clover Squing type 757 Comprises vessel fitting and clamp ring in 316SS plus Viton seal Hygienic 'O' ring seal fitting Max. operating pressure: 30 bar Max. operating temperature: 130 o C SK277 For use with 'O' ring seal Squing type 73F & 734 extended. 316SS fitting for welding to vessel with Viton 'O' ring 30.5 4.5 Thread GI DIN ISO 228 (1" BSPP) Ø60.0 Ø39.0
MOBREY SQUING... Product data sheet IP202 The right is reserved to amend without notice details given in this publication Status indicating LED Permanent indication of wetside condition and assurance to plant operators that Squing is in good working order - wet or dry Hygienic fittings This Tri-clover fitting is just one of the hygienic fittings available. May also be specified hand polished for hygienic applications Hand polished wetside Carefully hand polished to a mirror fibish of 0,4µm or better for use in hygienic and pharmaceutical applications ¾" Threaded mounting The smallest mounting on the market, allowing low cost installation in small vessels July 1997 Mobrey Squing: Minimum wetside length For all your level detection and control needs. Designed for minimum intrusion into the vessel or pipe As used in the following industries: Food & beverage Pharmaceutical Petrochemical Power generation Oil & gas In fact just about anywhere there are liquids to control! MEGGITT MOBREY BESTOBELL MOBREY GmbH Deutschland tel: 0211/99808-0 BESTOBELL SERVICE CO. LTD Taplow, En tel: 01 628 665114 KDG INSTRUMENTS Crawley, En tel: 01293525151 KDG MOBREY LTD China tel: 021 6219 0531 MOBREY Sp z o o Polska tel: 022 625 6896 MOBREY AB Sverige tel: 08-725 01 00 MOBREY SA France tel: 01.34.30.28.30 MOBREY SA-NV Belgium tel: 02/426.08.00 MEGGITT MOBREY LTD 190-196 Bath Road Slough Berks En SL1 4DN tel: 01753 534646 fax: 01753 823589 e-mail: sales@mobrey.co.uk http://www.mobrey.co.uk