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 • Fuel storage tanks • Flash tanks • Condensate receivers • Cooling towers • Interface
• Float guide cage • Tropicalized switch mechanism • Special flange face finishes • Submersible housing • Elevated temperature
• High and high/high alarm from single tank entry
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.
TECHNOLOGY
2 5 6 4 1 3
Pivot Return Spring
Process Liquid Process Liquid Rising Level Falling Level
T21
TANDEM
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.
UPPER ACTUATING LEVEL
Optional guide cage
LOWER ACTUATING LEVEL
AGENCY
AGENCY
APPROVALS
MODEL APPROVED APPROVAL CLASSES
FM
All with an electric switch mechanism and a housing listed as TYPE 4X/7/9 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 C & D Class II, Div 1, Groups E, F & G Class I, Div 1, Groups B, C & D Class II, Div 1, Groups E, F & G Class I, Div 2, Groups B, C & D Class I, Div 1, Groups C & D Class II, Div 1, Groups E, F & G Class I, Div 1, Groups B, C & D Class II, Div 1, Groups E, F & G ATEX II 2 G EEx d IIC T6 94/9/EC IEC Ex Ex d IIC T6 IP 66 Installation Category II Pollution Degree 2
CSA
All with a Series F, HS, H1, 8 or 9 electric switch mechanism and a housing listed as CSA TYPE 4X All with an electric switch mechanism and a housing listed as TYPE 4X/7/9 All with an electric switch mechanism and a housing listed as TYPE 4X/7/9 Class I, Div 1, Group B All with an electric switch mechanism and an ATEX housing
ATEX / IEC Ex
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
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) 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
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) BASIC ELECTRICAL RATINGS
Voltage 120 VAC 240 VAC 24 VDC 120 VDC 240 VDC B 15.00 15.00 6.00 0.50 0.25 C Switch Series and Non-Inductive Ampere Rating D F HS H1 R 8 10.00 — 10.00 10.00 3.00 0.25 — 4.00 0.30 — 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 — 1.00 — 3.00 — — 9 — — 0.50 — —
15.00 15.00 10.00 1.00 0.50
DIMENSIONAL
INCHES (mm)
SPECIFICATIONS
Housing TYPE 4X/7/9 Group B NEMA 1 Pneumatics
A
A 5.93 (151) 4.70 (119)
B 3.87 (98) 5.00 (127)
Conduit Connections 1" NPT dual entry
1
B
B A
6.25* (158)
⁄4" NPT single entry
All housings rotatable 360°. Pneumatic switches available with Series T20 units only.
7.94* (201)
8.46 (214)
10.12 (257) 2.44 (61) 1.81 (45) Ref. 1" NPT Distance to actuating level (4" min.) 6.25* (158)
B
Distance To
A
Maximum 40" (1016) 48" (1219)
Minimum 4" (102) 12" (305)
Upper level
7.94* (201)
Lower level
Distance to upper actuating level (4" min.) Actuating level Distance to lower actuating level
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 Distance to actuating level (4" min)
8" min.
Model T20 with 1" NPT
Actuating level
Actuating level
Model T21 with flange
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
SWITCH
SINGLE
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 1—Single float Tank Connection Carbon steel 316 SS 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. Uncontrolled housing heater or drain available in TYPE 4X/7/9 enclosure. Process temperature based on +100° F (+38° C) ambient.
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.
Consult factory for TYPE 4X/7/9 cast iron housings.
4
ELECTRIC SWITCH MECHANISM AND ENCLOSURE
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 -50 to +750 (-46 to +399) -50 to +550 (-46 to +288) -50 to +550 (-46 to +288) SPDT DPDT SPDT DPDT SPDT DPDT 1 1 1 1 1 1 FKP FNP HMC HMF HM3 HM7 FKT FNT HEK HET HM4 HM8 N/A HMF HA9 HB9 HM3 HM7 FAC FBC FKQ FNQ HMC FSS FNS HEK HET HM4 HM8 N/A FA9 FB9
Switch Description
Series B Snap Switch Series C Snap Switch Series D DC Current Snap Switch Series F Hermetically Sealed Snap Switch Series HS Hermetically Sealed 5-amp Snap Switch with Wiring Leads Series HS Hermetically Sealed 5-amp Snap Switch with Terminal Block Series H1 Hermetically Sealed 1-amp Snap Switch with Wiring Leads Series R High Temperature Snap Switch Series 8 Hermetically Sealed Snap Switch Series 9 High Temperature Hermetically Sealed Snap Switch Switch Description Series R High Temperature Snap Switch Series 9 High Temperature Hermetically Sealed Snap Switch
HA9 HB9
-50 to +750 (-46 to +399)
SPDT
1
HKC
N/A
HKC
N/A
-40 to +750 (-40 to +399)
SPDT DPDT SPDT DPDT SPDT DPDT
1 1 1 1 1 1
RKQ RNQ 8KP 8NP 9KP 9NP
RKS RNS 8KT 8NT 9KT 9NT
RA9 RB9 8AC 8BC 9AC 9BC
RKQ RNQ 8KQ 8NQ 9KQ 9NQ
RKS RNS 8KS 8NS 9KS 9NS
RA9 RB9 8A9 8B9 9A9 9B9
-50 to +750 (-46 to +399)
-50 to +750 (-46 to +399)
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 -40 to +1000 (-40 to +538) SPDT DPDT SPDT DPDT 1 1 1 1 R1Y RDY 9AR 9DR RKY RNY 9KR 9NR RKW RNW 9KV 9NV R1Y RDY 9AY 9DY RKY RNY 9KY 9NY RKW RNW 9KW 9NW
-50 to +1000 (-46 to +538)
PNEUMATIC SWITCH MECHANISM AND ENCLOSURE
Switch Description 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
Series J Bleed Type
Series K Non-Bleed
5
MODEL
T21
NUMBER
SWITCH
TANDEM
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 2—Tandem float Tank Connection Carbon steel 316 SS 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 — — — — 4.50 (114) Upper Lower 40 48 (1016) (1219) 40 48 (1016) (1219) 40 48 (1016) (1219) 21 48 (533) (1219) 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 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
Available only in cast iron.
Not available with -4 Materials of Construction.
Flanges are ANSI standard. Forged steel flanges have standard raised face.
On steam applications, temperature down-rated to +400° F (+204° C) process at +100° F (+38° C) ambient.
Consult factory for TYPE 4X/7/9 cast iron housings.
Uncontrolled housing heater or drain available in TYPE 4X/7/9 enclosure.
Process temperature based on +100° F (+38° C) ambient.
6
ELECTRIC SWITCH MECHANISM AND ENCLOSURE
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 -50 to +750 (-46 to +399) -50 to +550 (-46 to +288) SPDT DPDT SPDT DPDT 2 2 2 2 FLA FOA HMN HMY FLJ FOJ HMP N/A HMZ HMY HMZ FDC FGC FLB FOB HMN FLK FOK HMP N/A FD9 FG9
Switch Description
Series B Snap Switch Series C Snap Switch Series D DC Current Snap Switch Series F Hermetically Sealed Snap Switch Series HS Hermetically Sealed 5-amp Snap Switch with Wiring Leads Series H1 Hermetically Sealed 1-amp Snap Switch with Wiring Leads Series R High Temperature Snap Switch Series 8 Hermetically Sealed Snap Switch Series 9 High Temperature Hermetically Sealed Snap Switch Switch Description Series R High Temperature Snap Switch Series 9 High Temperature Hermetically Sealed Snap Switch
-50 to +750 (-46 to +399)
SPDT
2
HKN
HKP
N/A
HKN
HKP
N/A
-40 to +750 (-40 to +399)
SPDT DPDT SPDT DPDT SPDT DPDT
2 2 2 2 2 2
RLB ROB 8LA 8OA 9LA 9OA
RLK ROK 8LJ 8OJ 9LJ 9OJ
RD9 RG9 8DC 8GC 9DC 9GC
RLB ROB 8LB 8OB 9LB 9OB
RLK ROK 8LK 8OK 9LK 9OK
RD9 RG9 8D9 8G9 9D9 9G9
-50 to +750 (-46 to +399)
-50 to +750 (-46 to +399)
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 -40 to +1000 (-40 to +538) SPDT DPDT SPDT DPDT 2 2 2 2 R3M REM 9BD 9ED RLM ROM 9LD 9OD RLW ROW 9LV 9OV R3M REM 9BM 9EM RLM ROM 9LM 9OM RLW ROW 9LW 9OW
-50 to +1000 (-46 to +538)
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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.
ESP
Expedite Ship Plan
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). To take advantage of ESP, match the color coded model number codes in the selection charts (standard dimensions apply).
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.
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
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