Top Mounting T20 and T21 Liquid Level Switches DESCRIPTION T20 and T21 units are simple, reliable float switches, designed for top mounting into tanks or vessels. T20 units utilize a single switch mechanism and float. T21 tandem units utilize two switch mechanisms and two separate floats. T20 and T21 models are available for any type of open or closed vessel, with either threaded or flanged type mounting, and actuating depths of up to 48 inches (1219 mm). FEATURES • Float diameters of 3" × 5", 4" and 41⁄2" available • Tank connections available in 1" NPT, cast iron, forged, or stainless steel flanges • Choice of switch mechanism: Dry contact Hermetically sealed Pneumatic • Choice of switch enclosure: NEMA 1 carbon steel for pneumatics TYPE 4X/7/9 Class I, Div. 1, Groups C & D, polymer coated aluminum TYPE 4X/7/9 Class I, Div. 1, Group B, polymer coated aluminum OPTIONS • NACE • ATEX approved housing • Housing heater APPLICATIONS • Day tanks • Condensate receivers • Fuel storage tanks • Cooling towers • Flash tanks • Interface • High and high/high alarm from single tank entry • Float guide cage • Tropicalized switch mechanism • Special flange face finishes • Submersible housing • Elevated temperature TECHNOLOGY A permanent magnet is attached to a pivoted switch actuator and adjustment screw . As the float rises following the liquid level, it raises the attraction sleeve into the field of the magnet, which then snaps against the non-magnetic enclosing tube , actuating the switch . The enclosing tube provides a static pressure boundary between the switch mechanism and the process. On a falling level, an inconel spring retracts the magnet, deactivating the switch. T21 TANDEM 2 5 Pivot 6 4 Return Spring 1 3 Process Liquid Process Liquid Rising Level Falling Level MODELS T21 tandem models combine the functions of two separate narrow differential level controls in a single, compact, easy to install instrument. Two individual switch mechanisms are employed to provide two actuating levels at least 8" apart. These instruments are ideally used in applications requiring two separate switching points, such as high and low level alarm operation. Model T21 tandem float switches are available with an optional cage to help stabilize the floats under turbulent conditions. Consult your local representative for ordering information. AGENCY Optional guide cage LOWER ACTUATING LEVEL APPROVALS AGENCY MODEL APPROVED APPROVAL CLASSES FM All with an electric switch mechanism and a housing listed as TYPE 4X/7/9 Class I, Div 1, Groups C & D Class II, Div 1, Groups E, F & G All with an electric switch mechanism and a housing listed as TYPE 4X/7/9 Class I, Div 1, Group B Class I, Div 1, Groups B, C & D Class II, Div 1, Groups E, F & G All with a Series F, HS, H1, 8 or 9 electric switch mechanism and a housing listed as CSA TYPE 4X Class I, Div 2, Groups B, C & D All with an electric switch mechanism and a housing listed as TYPE 4X/7/9 Class I, Div 1, Groups C & D Class II, Div 1, Groups E, F & G All with an electric switch mechanism and a housing listed as TYPE 4X/7/9 Class I, Div 1, Group B Class I, Div 1, Groups B, C & D Class II, Div 1, Groups E, F & G All with an electric switch mechanism and an ATEX II 2 G EEx d IIC T6 94/9/EC IEC Ex Ex d IIC T6 IP 66 CSA ATEX / IEC Ex ATEX housing CE Low Voltage Directives 2006/95/EC Per Harmonized Standard: EN 61010-1/1993 & Amendment No. 1 Dual stage units with ‘HS’ or ‘H1’ switches are not ATEX approved. 2 UPPER ACTUATING LEVEL Installation Category II Pollution Degree 2 SPECIFICATIONS SWITCH MECHANISMS AND ENCLOSURES SERIES B, C, D & R DRY CONTACT SWITCHES • Designed for AC and DC current applications • Process temperatures to +1000° F (+538° C) SERIES HS, H1, 8 & 9 HERMETICALLY SEALED SWITCHES • Ideal for use in salt and other corrosive atmospheres • HS & H1 are positively pressurized capsules for entire mechanism and contacts • Process temperatures to +1000° F (+538° C) SERIES J & K PNEUMATIC SWITCHES • Suited for applications where electrical power is not available • Bleed and non-bleed designs • Process temperatures to +400° F (+204° C) SWITCH ENCLOSURES • TYPE 4X/7/9 aluminum enclosures • Designed to meet Class I, Div. 1, Groups C & D and Class I, Div. 1 Group B • Optional housing heaters and drains available for some enclosures • Pneumatic switch mechanisms available with a NEMA 1 enclosure BASIC ELECTRICAL RATINGS Voltage 120 VAC 240 VAC 24 VDC 120 VDC 240 VDC Switch Series and Non-Inductive Ampere Rating D F HS H1 R 8 B C 15.00 15.00 6.00 0.50 0.25 15.00 15.00 10.00 1.00 0.50 10.00 — 10.00 10.00 3.00 0.25 — 4.00 0.30 — DIMENSIONAL INCHES 5.00 5.00 5.00 0.50 0.25 1.00 1.00 1.00 0.40 — 1.00 1.00 1.00 0.40 — 9 1.00 — 3.00 — — — — 0.50 — — SPECIFICATIONS (mm) Housing TYPE 4X/7/9 Group B B B A 6.25* (158) 8.46 (214) NEMA 1 Pneumatics B 6.25* (158) 1.81 (45) Ref. 1" NPT 8" min. Distance to lower actuating level Actuating level Model T21 with flange Conduit Connections 1" NPT dual entry 4.70 (119) 5.00 (127) 1 ⁄4" NPT single entry 7.94* (201) Distance to actuating level (4" min.) Distance To Maximum Upper level 40" (1016) Minimum 4" (102) Lower level 48" (1219) 12" (305) A 2.44 (61) Actuating level B 3.87 (98) All housings rotatable 360°. Pneumatic switches available with Series T20 units only. A 10.12 (257) Distance to upper actuating level (4" min.) A 5.93 (151) 7.94* (201) 1.81 (45) Ref NOTE: On Model T21 the lower float actuates upper switch mechanism. The upper float actuates the lower switch mechanism. Actuating level Model T20 with 1" NPT Distance to actuating level (4" min) Actuating level Model T20 with flange * These dimensions increase by 2.19 (55) when unit is supplied with an HS switch with terminal block. 3 MODEL T20 NUMBER SINGLE SWITCH Models available for quick shipment, usually within one week after factory receipt of a complete purchase order, through the Expedite Ship Plan (ESP) IMPORTANT: Actuating level(s), in either the rising or falling state, and specific gravity must be provided upon placement of order. MODEL NUMBER CODE AND MATERIALS OF CONSTRUCTION Model No. T20-1 T20-4 Set Points Tank Connection Carbon steel 316 SS 1—Single float Float and Trim 300 Series SS 316 SS Sleeve 400 Series SS 316 SS IMPORTANT: The maximum available insertion depth is governed by the liquid specific gravity and selected float size as given in the table below. The minimum insertion depth is four inches. MAXIMUM INSERTION LENGTH inches (mm) FLOAT PRESSURE RATINGS Liquid Specific Gravity 1.00 0.90 0.80 0.70 0.60 3.00 x 5.00 (76 x 127) 39 (991) 20 (508) — — — Float Size 4.00 (102) 48 (1219) 33 (838) 11 (279) — — 4.50 (114) 48 (1219) 48 (1219) 48 (1219) 38 (965) 6 (152) Float Size Inches (mm) 3.00 x 5.00 (76 x 127) 4.00 (102) 4.50 (114) 100° F (38° C) 500 (34) 600 (41) 500 (34) Pressure Rating PSIG (bar) 750° F 900° F 1000° F (399° C) (482° C) (538° C) 377 (26) 483 (33) 403 (28) 353 (24) 465 (32) 388 (27) 335 (23) 459 (32) 383 (26) TANK CONNECTION AND FLOAT SIZE Tank Connection 1" NPT 4" 125 lb. C.I. flange 4" 150 lb. F.S. flange 5" 125 lb. C.I. flange 5" 150 lb. F.S. flange 6" 125 lb. C.I. flange 6" 150 lb. F.S. flange 6" 300 lb. F.S. flange 3.00 x 5.00 (76 x 127) B2A H2A H3A J2A J3A K2A K3A — Float Diameter 4.00 (102) B2B — — J2B J3B K2B K3B — 4.50 (114) B2C — — J2C J3C K2C K3C K4C Flanges are ANSI standard threaded onto 1" NPT bushing. Forged steel flanges have standard raised face. Not available with Model T20-4. Available only in cast iron. Available with material option code 1 only. C/F for stainless steel construction. Process temperature based on +100° F (+38° C) ambient. Uncontrolled housing heater or drain available in TYPE 4X/7/9 enclosure. Consult factory for TYPE 4X/7/9 cast iron housings. On steam applications, temperature down-rated to +400° F (+204° C) process at +100° F (+38° C) ambient. CSA approval does not apply to Series HE switches. 4 ELECTRIC SWITCH MECHANISM AND ENCLOSURE Switch Description Series B Snap Switch Series C Snap Switch Series D DC Current Snap Switch T20-1 Models T20-4 Models Process TYPE 4X/7/9 Aluminum Enclosure Temperature Set Contacts Range ATEX ATEX Points Class I, Div 1 Class I, Div 1 Class I, Div 1 Class I, Div 1 Ex II 2 G EEx Ex II 2 G EEx °F (°C) Groups C&D Group B Groups C&D Group B d IIC T6 d IIC T6 SPDT 1 BKP BKT BAC BKQ BKS BA9 -40 to +250 (-40 to +121) DPDT 1 BNP BNT BBC BNQ BNS BB9 SPDT 1 CKP CKT CAC CKQ CKS CA9 -40 to +450 (-40 to +232) DPDT 1 CNP CNT CBC CNQ CNS CB9 SPDT 1 DKQ BKS DA9 -40 to +250 N/A (-40 to +121) DPDT 1 DNQ DNS DB9 Series F Hermetically Sealed Snap Switch -50 to +750 (-46 to +399) Series HS Hermetically Sealed 5-amp Snap Switch with Wiring Leads -50 to +550 (-46 to +288) Series HS Hermetically Sealed 5-amp Snap Switch with Terminal Block -50 to +550 (-46 to +288) Series H1 Hermetically Sealed 1-amp Snap Switch with Wiring Leads -50 to +750 (-46 to +399) Series R High Temperature Snap Switch -40 to +750 (-40 to +399) Series 8 Hermetically Sealed Snap Switch -50 to +750 (-46 to +399) Series 9 High Temperature Hermetically Sealed Snap Switch -50 to +750 (-46 to +399) Switch Description SPDT 1 FKP FKT FAC FKQ FSS FA9 DPDT 1 FNP FNT FBC FNQ FNS FB9 SPDT 1 HMC HEK HMC HEK HET N/A HMF DPDT 1 HMF HET N/A SPDT 1 HM3 HM4 HA9 HM3 HM4 HA9 DPDT 1 HM7 HM8 HB9 HM7 HM8 HB9 SPDT 1 HKC SPDT 1 RKQ RKS RA9 RKQ RKS RA9 DPDT 1 RNQ RNS RB9 RNQ RNS RB9 SPDT 1 8KP 8KT 8AC 8KQ 8KS 8A9 DPDT 1 8NP 8NT 8BC 8NQ 8NS 8B9 SPDT 1 9KP 9KT 9AC 9KQ 9KS 9A9 DPDT 1 9NP 9NT 9BC 9NQ 9NS 9B9 N/A HKC N/A Process Cast Iron Cast Iron CS/Aluminum CS/Aluminum Set Temp. Range Contacts Class I, Div 1 Class I, Div 1 Class I, Div 1 Class I, Div 1 Points NEMA 4X NEMA 4X °F (°C) Groups C&D Group B Groups C&D Group B Series R High Temperature Snap Switch -40 to +1000 (-40 to +538) Series 9 High Temperature Hermetically Sealed Snap Switch -50 to +1000 (-46 to +538) SPDT 1 R1Y RKY RKW R1Y RKY RKW DPDT 1 RDY RNY RNW RDY RNY RNW SPDT 1 9AR 9KR 9KV 9AY 9KY 9KW DPDT 1 9DR 9NR 9NV 9DY 9NY 9NW PNEUMATIC SWITCH MECHANISM AND ENCLOSURE Switch Description Series J Bleed Type Series K Non-Bleed Maximum Maximum Supply Process Pressure Temperature 100 psig (7 bar) 400° F (204° C) 60 psig (4 bar) 100 psig 700° F (7 bar) (371° C) 100 psig (7 bar) 400° F (204° C) 40 psig (3 bar) Bleed Orifice NEMA 1 Diameter .063 (1.6 mm) .094 (2.4 mm) .055 (1.4 mm) JDE JEE JFE — KOE — KOG 5 MODEL T21 NUMBER TANDEM SWITCH IMPORTANT: Actuating level(s), in either the rising or falling state, and specific gravity must be provided upon placement of order. MODEL NUMBER CODE AND MATERIALS OF CONSTRUCTION Model No. T21-1 T21-4 Set Points Tank Connection Carbon steel 316 SS 2—Tandem float Float and Trim 300 Series SS 316 SS Sleeve 400 Series SS 316 SS IMPORTANT: The maximum available insertion depth is governed by the liquid specific gravity and selected float size as given in the table below. The minimum insertion depth is four inches. The minimum distance between the top and bottom insertion depths is eight inches. MAXIMUM INSERTION LENGTH inches (mm) FLOAT PRESSURE RATINGS Float Size Liquid 3.00 x 5.00 4.00 (76 x 127) (102) Specific Gravity Upper Lower Upper Lower 21 48 32 48 1.00 (533) (1219) (813) (1219) 9 30 18 44 0.90 (229) (762) (457) (1118) 4 21 0.80 — — (102) (533) 0.70 — — — — Float Size Inches (mm) 4.50 (114) Upper Lower 40 48 (1016) (1219) 40 48 (1016) (1219) 40 48 (1016) (1219) 21 48 (533) (1219) 3.00 x 5.00 (76 x 127) 4.00 (102) 4.50 (114) 100° F (38° C) Pressure Rating PSIG (bar) 750° F 900° F 1000° F (399° C) (482° C) (538° C) 500 (34) 600 (41) 500 (34) 377 (26) 483 (33) 403 (28) 353 (24) 465 (32) 388 (27) 335 (23) 459 (32) 383 (26) TANK CONNECTION AND FLOAT SIZE Tank Connection 4" 125 lb. C.I. flange 4" 150 lb. F.S. flange 5" 125 lb. C.I. flange 5" 150 lb. F.S. flange 6" 125 lb. C.I. flange 6" 150 lb. F.S. flange 6" 300 lb. F.S. flange 3.00 x 5.00 (76 x 127) H2A H3A J2A J3A K2A K3A — Float Diameter 4.00 (102) — — J2B J3B K2B K3B — 4.50 (114) — — J2C J3C K2C K3C K4C Flanges are ANSI standard. Forged steel flanges have standard raised face. Not available with -4 Materials of Construction. Available only in cast iron. Process temperature based on +100° F (+38° C) ambient. Uncontrolled housing heater or drain available in TYPE 4X/7/9 enclosure. Consult factory for TYPE 4X/7/9 cast iron housings. On steam applications, temperature down-rated to +400° F (+204° C) process at +100° F (+38° C) ambient. 6 ELECTRIC SWITCH MECHANISM AND ENCLOSURE Switch Description Series B Snap Switch Series C Snap Switch Series D DC Current Snap Switch T21-1 Models T21-4 Models Process TYPE 4X/7/9 Aluminum Enclosure Temperature Set Contacts Range ATEX ATEX Points Class I, Div 1 Class I, Div 1 Class I, Div 1 Class I, Div 1 Ex II 2 G EEx Ex II 2 G EEx °F (°C) Groups C&D Group B Groups C&D Group B d IIC T6 d IIC T6 SPDT 2 BLA BLJ BDC BLB BLK BD9 -40 to +250 (-40 to +121) DPDT 2 BOA BOJ BGC BOB BOK BG9 SPDT 2 CLA CLJ CDC CLB CLK CD9 -40 to +450 (-40 to +232) DPDT 2 COA COJ CGC COB COK CG9 SPDT 2 DLB DLK DD9 DLB DLK DD9 -40 to +250 (-40 to +121) DPDT 2 DOB DOK DG9 DOB DOK DG9 Series F Hermetically Sealed Snap Switch -50 to +750 (-46 to +399) Series HS Hermetically Sealed 5-amp Snap Switch with Wiring Leads -50 to +550 (-46 to +288) Series H1 Hermetically Sealed 1-amp Snap Switch with Wiring Leads -50 to +750 (-46 to +399) Series R High Temperature Snap Switch -40 to +750 (-40 to +399) Series 8 Hermetically Sealed Snap Switch -50 to +750 (-46 to +399) Series 9 High Temperature Hermetically Sealed Snap Switch -50 to +750 (-46 to +399) Switch Description SPDT 2 FLA FLJ FDC FLB FLK FD9 DPDT 2 FOA FOJ FGC FOB FOK FG9 SPDT 2 HMN HMP HMN HMP HMY HMZ N/A N/A DPDT 2 HMY HMZ SPDT 2 HKN HKP N/A HKN HKP N/A SPDT 2 RLB RLK RD9 RLB RLK RD9 DPDT 2 ROB ROK RG9 ROB ROK RG9 SPDT 2 8LA 8LJ 8DC 8LB 8LK 8D9 DPDT 2 8OA 8OJ 8GC 8OB 8OK 8G9 SPDT 2 9LA 9LJ 9DC 9LB 9LK 9D9 DPDT 2 9OA 9OJ 9GC 9OB 9OK 9G9 Process Cast Iron Cast Iron CS/Aluminum CS/Aluminum Set Temp. Range Contacts Class I, Div 1 Class I, Div 1 Class I, Div 1 Class I, Div 1 Points NEMA 4X NEMA 4X °F (°C) Groups C&D Group B Groups C&D Group B Series R High Temperature Snap Switch -40 to +1000 (-40 to +538) Series 9 High Temperature Hermetically Sealed Snap Switch -50 to +1000 (-46 to +538) SPDT 2 R3M RLM RLW R3M RLM RLW DPDT 2 REM ROM ROW REM ROM ROW SPDT 2 9BD 9LD 9LV 9BM 9LM 9LW DPDT 2 9ED 9OD 9OV 9EM 9OM 9OW 7 QUALITY The quality assurance system in place at Magnetrol guarantees the highest level of quality throughout the company. Magnetrol is committed to providing full customer satisfaction both in quality products and quality service. The Magnetrol quality assurance system is registered to ISO 9001 affirming its commitment to known international quality standards providing the strongest assurance of product/service quality available. Several Liquid Level Switches are available for quick shipment, usually within one week after factory receipt of a complete purchase order, through the Expedite Ship Plan (ESP). ESP service may not apply to orders of ten units or more. Contact your local representative for lead times on larger volume orders, as well as other products and options. ESP Expedite Ship Plan To take advantage of ESP, match the color coded model number codes in the selection charts (standard dimensions apply). WARRANTY All Magnetrol mechanical level and flow controls are warranted free of defects in materials or workmanship for five full years from the date of original factory shipment. If returned within the warranty period; and, upon factory inspection of the control, the cause of the claim is determined to be covered under the warranty; then, Magnetrol will repair or replace the control at no cost to the purchaser (or owner) other than transportation. Magnetrol shall not be liable for misapplication, labor claims, direct or consequential damage or expense arising from the installation or use of equipment. There are no other warranties expressed or implied, except special written warranties covering some Magnetrol products. 5300 Belmont Road • Downers Grove, Illinois 60515-4499 • 630-969-4000 • Fax 630-969-9489 • www.magnetrol.com 145 Jardin Drive, Units 1 & 2 • Concord, Ontario Canada L4K 1X7 • 905-738-9600 • Fax 905-738-1306 Heikensstraat 6 • B 9240 Zele, Belgium • 052 45.11.11 • Fax 052 45.09.93 Regent Business Ctr., Jubilee Rd. • Burgess Hill, Sussex RH15 9TL U.K. • 01444-871313 • Fax 01444-871317 Copyright © 2011 Magnetrol International, Incorporated. All rights reserved. Printed in the USA. Performance specifications are effective with date of issue and are subject to change without notice. Magnetrol & Magnetrol logotype are registered trademarks of Magnetrol International. BULLETIN: 44-117.21 EFFECTIVE: May 2010 SUPERSEDES : September 2009