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Section 1

Model 351/352/353 Liquid Level Systems

Product Description

Model 351 Liquid Level System

The Model 351 consists of a

single reference sensor

connected by capillary

tubing to a Barton Differential Pressure Unit (DPU). Hydraulic fluid is sealed

inside the sensor and the capillary tubing, eliminating the need for additional

piping.

The Model 351 system, as shipped from the factory, needs only to be mount-

ed on the vessel to provide continuous level measurement when used with a

Barton readout instrument. The sensor can be installed on vented or sealed

process vessels. The readout instrument (DPU, for example) can be installed

at various elevations (i.e., below the vessel, at the vessel upper connection or

above the vessel ) as long as the instrument calibration considers the elevation

difference between the instrument and the sensor.

Model 352 Liquid Level System

The Model 352 consists of

two reference sensors

connected by capillary tub-

ing to a Barton DPU.

Unlike the Model 351 system, the process media does not come into contact

with the DPU, making the model ideal for applications involving corrosive

liquids or tank temperatures above 200°F (95°C).

The DPU can be mounted up to 50 ft (15 meters) away from the vented or

sealed process vessel and at ele vations up to 30 ft (9 meters) above the lowest

sensor. Elevation of the readout instrument (DPU) with respect to the sensors

is essentially unlimited as long as the instrument calibration considers the

elevation difference between the two sensors.

Model 351/352 System Sensors

A Model 351 or Model 352 system can include any of three sensor types,

depending on the pressure rating required:
•

500-psi SWP sensor (referred to as Model 351 sensor throughout this

document)

•

3,000-psi SWP sensor (referred to as Model 351 sensor throughout this

document)

•

No-pressure-rating sensor (referred to as Model S048 sensor throughout

this document)

All three sensor types contain a 3.75” (95 mm) bellows that functions as a

seal. As pressure on the bellows varies due to changes in liquid level and/or

process system pressure variations, these pressure variations are transmitted

through the liquid filled sensor and capillary tubing to the readout instrument.

Содержание 351

Страница 1: ...cations 6 Section 2 Theory of Operation 7 General 7 Model 353 Sensor 7 Section 3 Installation 9 Unpacking 9 Model 353 Sensor Assembly 9 Mounting 9 Piping and Installation 9 Section 4 Operation Maintenance and Calibration 13 Startup 13 General Field and Periodic Maintenance 13 Model 351 Sensor Inspection and Cleaning 13 Model 353 Sensor Inspection and Cleaning 13 Model 353 Sensor Bellows Removal Re...

Страница 2: ...hylene propylene and 316 stainless steel Vibration and Shock The instrument shall not be subjected to severe me chanical vibration or hydraulic shock WARNING This symbol identifies information about practices or circum stances that can lead to personal injury or death property damage or economic loss CAUTION Indicates actions or procedures which if not performed correctly may lead to personal inju...

Страница 3: ...igned in the following configurations a single sensor system Model 351 a dual sensor system Model 352 For applications involving corrosive fluids or tank temperatures above 200 F 95 C a dual sensor configuration is recommended For applications involving unusual fill requirements due to liquid volumes or high ambient temperatures a Model 353 system is recommended The Model 353 system can be designe...

Страница 4: ...e process media does not come into contact with the DPU making the model ideal for applications involving corrosive liquids or tank temperatures above 200 F 95 C The DPU can be mounted up to 50 ft 15 meters away from the vented or sealed process vessel and at ele vations up to 30 ft 9 meters above the lowest sensor Elevation of the readout instrument DPU with respect to the sensors is essentially ...

Страница 5: ...initial volume of 10 in 164 cc The bellows is 2 25 in 57 mm long and has a diameter of 3 75 in 95 mm It can extend an additional 1 in 25 mm adding an additional 7 5 in 123 cc to its volumetric capacity see Figure 1 2 When the bellows is fully compressed an internal valve closes to prevent the escape of process fluids The bellows may be removed for replacing a dam aged bellows or for pressure testi...

Страница 6: ...essure N A 500 or 3000 psi 3 5 or 20 7 MPa 3000 psi 20 7 MPa Bellows Material 316L SST 316L SST 316L SST Housing Seals N A O ring Backup O ring O ring Backup O ring and Flat Nickel Gasket Bellows Volume Nominal 3 5 in 57 4 cc 3 5 in 57 4 cc 10 in 165 cc Thermal Expansion N A N A 17 5 in 288 cc Bellows Seals O rings O rings O rings Table 1 2 Capillary Specifications Specification 1 4 in OD 3 16 in ...

Страница 7: ...tion as isolation seals As pres sure on the sensor bellows varies due to changes in liquid level the variations are transmitted hydraulically through the tubing to the bellows of the DPU Model 351 Model S048 Sensors The pressure deflection characteristics of the Model 351 500 psi or 3 000 psi and Model S048 sensor bellows are shown in Figure 2 1 Figure 2 1 Pressure deflection characteristics of th...

Страница 8: ...cteristics of the Model 353 sensor bellows are shown in Figure 2 2 Travel to fully close valve 0 84 in 21 mm Normal length 2 25 in 57 mm 1 in 25 mm Figure 2 2 Pressure deflection characteristics of the Model 353 sensor bellows The bellows can extend over 1 in 25 mm to accommodate fill fluid expan sion under hot operating conditions As seen in Figure 2 2 the expansion creates an internal pressure o...

Страница 9: ...ent of Model 353 sensor bellows Mounting Mount the sensors as close to vertical orientation as possible to ensure proper operation The sensor may be oriented with the vent pointed up or down depending on the service or installation design When mounted with the L bracket mount the sensors with three 3 8 16 SAE bolts Grade 5 or better torqued to 24 to 26 ft lb 33 35 N m The mount ing bracket may be ...

Страница 10: ...cedures necessary to weld the capillary tubing and tubing coupling Figure 3 1 1 4 in OD capillary tubing welds IMPORTANT All parts are solution annealed 316 or 304 stainless steel Please adhere to the following welding practices 1 Weld type GTAW fillet 45 amps 10 volts 20 CFH 9 5 l m Argon gas flow 2 Use 1 16 dia Type 308 filler rod ...

Страница 11: ...re 3 2 3 16 in OD capillary tubing welds IMPORTANT All parts are solution annealed 304L stainless steel Please adhere to the following welding practices 1 Weld type GTAW fillet 45 amps 10 volts 20 CFH 9 5 l m Argon gas flow 2 Use 1 16 dia Type 308 filler rod ...

Страница 12: ...ckup ring Penetration through the tubing wall is not required Figure 3 3 3 16 in OD capillary tubing coupling welds IMPORTANT All parts are solution annealed 304L stainless steel Please adhere to the following welding practices 1 Weld type GTAW V groove 45 amps 10 volts 20 CFH 9 5 l m Argon gas flow 2 Use 1 16 dia Type 308 filler rod ...

Страница 13: ...ions using a soft brush and solvent as required 3 Inspect the O rings and seals before reassembly Replace as necessary see note on page 17 4 Replace the housing over the sensor bellows For 3000 psi 20 7 MPa sensors lubricate the bolt threads and seat the bolts at 34 to 35 ft lb 46 to 48 N m For 500 psi 3 5 MPa sensors install the retaining ring Model 353 Sensor Inspection and Cleaning 1 Remove the...

Страница 14: ...d lift ing the bellows until the guide stem is withdrawn from the capillary tubing Observe the two O rings on the bot tom of the valve seat they may fall free when the bellows is lifted 3 Pressure Tests Only Install a test fitting with an O ring refer to Figure 4 1 item 4 and Figure 4 2 page 15 Tighten with the sensor bellows wrench to 39 to 40 ft lb 53 to 55 N m Remove the test fitting when press...

Страница 15: ...on the bottom plate Lubricate the O rings and backup ring lightly with lubricant part number 9A C0002 1003U and insert in the appropriate grooves 6 Engage the valve seat to the bottom plate The guide stem must enter the capillary tubing without restric tion IMPORTANT To prevent loss of the O rings in the valve seat invert the bellows and bottom plate during this step 7 Tighten the valve seat with ...

Страница 16: ...leshooting procedures for the sensor are presented in Table 4 2 Table 4 2 Sensor Troubleshooting Chart Problem Probable Cause Corrective Action Transmitter reading off zero 1 with empty tank Minor elevation errors Re zero transmitter according to actuated instrument technical manual Transmitter reading off zero exceeds 1 Elevations of sensors or transmitter are incorrect Raise lower upper sensor R...

Страница 17: ...ensor type in the corresponding tables Sensor Type Table Reference Model 351 Sensor 500 psi 3 5 MPa 5 1 page 18 Model 351 Sensor 3000 psi 20 7 MPa 5 2 page 20 Model S048 Sensor 5 3 page 22 Model 353 Sensor 5 4 page 24 Fill Valve Assembly 5 5 page 26 IMPORTANT O rings should be examined anytime the seal is opened They should be replaced whenever surfaces are damaged or deteriorated squeeze is less ...

Страница 18: ... 4 O D Tubing SST 9A C0305 1001C As Required As Required 4 Tubing 1 4 O D Capillary SST 9A C0700 1014P As Required As Required 5 Bellows Assembly 1 2 SST 9A C0351 0001B Inconel 9A C0351 1031B 6 Sensor Housing 1 2 1 NPT 9A C0351 0014C 3 4 NPT 9A CS696 0231Z 7 Vent Fitting 1 2 1 4 NPT Plug 9A C0199 0214C 1 4 NPT Plug drilled for Lock wire 9A C0224 0272C 3 8 Tube Fitting 9A C0505 1029M 3 8 Tube Fitti...

Страница 19: ... Sched 80 2 long 316 SST 9A CS696 0374Z 1 Sched 80 4 long 316 SST 9A CS696 0373Z 1 Sched 80 6 long 316 SST 9A CS696 0070Z 1 Sched 80 8 long 316 SST 9A CS696 0351Z Sched 40 8 long 316 SST 9A CS696 0371C 17 Flanges Alternate Process Con nection to be used with a nipple not shown 1 2 1 Class 150 RF SO 316 SST 9A C0059 1633T 1 Class 300 RF SO 316 SST 9A C0059 1632T 1 Class 600 RF SO 316 SST 9A C0059 1...

Страница 20: ... Plate Bottom SST 9A C0351 0018C 1 2 4 Protective Spring for 1 4 O D Tubing SST 9A C0305 1001C As Required As Required 5 Tubing 1 4 O D Capillary SST 9A C0700 1014P As Required As Required 6 Screw Socket Head Cap 3 8 24 x 1 1 8 long SST 9A C0220 1039J 6 12 7 Bellows Assembly 1 2 SST 9A C0351 0001B Inconel 9A C0351 1031B 8 Sensor Housing 1 NPT 9A C0351 0016C 1 2 9 Bracket Mounting 9A CS778 0078Z 1 ...

Страница 21: ...sed with a flange not shown 1 2 1 Sched 40 2 long 316 SST 9A CS696 0365C 1 Sched 40 4 long 316 SST 9A CS696 0366C 1 Sched 40 6 long 316 SST 9A CS696 0367C 1 Sched 40 8 long 316 SST 9A CS696 0368C 1 Sched 80 2 long 316 SST 9A CS696 0374Z 1 Sched 80 4 long 316 SST 9A CS696 0373Z 1 Sched 80 6 long 316 SST 9A CS696 0070Z 1 Sched 80 8 long 316 SST 9A CS696 0351Z 20 Flanges Alternate Process Con nection...

Страница 22: ...Test Assembly 9A CS048 0018B 1 2 4 Sensor Adapter SST 9A C0353 1010C 1 2 5 Washer SST 9A C0353 1006C 1 2 6 Nut SST 9A C0353 1005C 1 2 7 Bracket Mounting 9A CS778 0078Z 1 2 8 O ring 014 EPT 9A C0001 1050R 2 4 9 Nut SST 9A CS048 0041C 1 2 10 Protective Spring for 1 4 O D Tubing SST 9A C0305 1001C As Required As Required 11 Tubing Capillary 1 4 O D SST 9A C0700 1014P As Required As Required 12 Washer...

Страница 23: ...lange not shown 1 2 1 Solid 2 long 316 SST 9A CS696 0065Z 1 Solid 6 long 316 SST 9A CS696 0151Z 17 Flanges Alternate mounting to be used with a nipple not shown 1 2 1 Class 150 FF SO 316 SST 9A CS696 0375C 2 1 Class 150 FF SO 316 SST 9A CS696 0363T Recommended Spare Parts EPT Ethylene Propylene Terpolymer Model 351 systems have a single sensor Model 352 systems require two sensors ...

Страница 24: ...ead Cap 3 8 24 x 1 1 2 long SST 9A C0220 1028J 12 4 O ring EPT 9A C0001 1074R 1 5 Ring Backup EPT 9A C0001 1116R 1 6 Bellows Assembly SST 9A C0353 1036B 1 7 Bracket 9A CS778 0078Z 1 8 Washer SST 9A C0353 1006C 1 9 Nut SST 9A C0353 1005C 1 10 Process Connection Tube Fitting 1 3 8 Tube 9A C0505 1028M 1 2 Tube 9A C0505 1070M 3 4 Tube 9A C0505 1026M 11 Washer Split Lock 3 8 SST 9A C0003 1171K 12 12 Pl...

Страница 25: ...dapter 1 4 NPT x 3 8 Tube SST 9A C0505 1029M 1 20 Plug 3 8 Tube SST 9A C0600 1012L 1 21 Adapter Capillary Tubing 1 4 O D x 3 16 O D SST 9A C0353 1080C 1 22 Capillary Armored 3 16 O D 0 049 Wall 200 ft 61 m in length 9A C0353 1090B As Required 23 Sleeve Female 3 16 O D Tubing Coupling not shown 9A C0353 1092C As Required 24 Sleeve Male 3 16 O D Tubing Coupling not shown 9A C0353 1094C As Required 2...

Страница 26: ...1044B Item Description Part No Qty Unit 1 Valve Body Assembly 9A C0353 1014B 1 2 Valve 9A C0353 1011C 2 3 O ring Backup EPT 8 006 9A C0001 1062R 2 4 O ring EPT 2 006 9A C0001 1063R 2 5 Fill Valve Cover 9A C0353 1012C 2 6 Lubricant O ring not shown 9A C0002 1003U As Required Recommended Spare Parts EPT Ethylene Propylene Terpolymer ...

Страница 27: ...this section show the outline dimensions for each sensor as sembly These images are based on production drawing 9A C0351 10782 Liquid Level System Type Figure Reference Model 351 500 psi 3 5 MPa 6 1 page 28 Model 351 3000 psi 20 7 MPa 6 2 page 29 Model S048 6 3 page 30 Model 353 3000 psi 20 7 MPa 6 4 page 31 ...

Страница 28: ...LE WITH 3 4 1 PIPE WITH FLANGE CONNECTION 4 MOUNTING BRACKET CAN BE ROTATED OR REVERSED AS NECESSARY TO SATISFY INSTALLATION REQUIREMENTS 3 TORQUE BOTTOM PLATE CAP SCREWS TO 35 FT LB 47 N m 2 TORQUE MOUNTING BRACKET NUT TO 147 5 FT LB 200 N m 1 ALL DIMENSIONS ARE 0 13 IN 3 2 MM UNLESS OTHERWISE NOTED Figure 6 1 Model 351 sensor 500 psi 3 5 Mpa ...

Страница 29: ...E WITH 3 4 1 PIPE WITH FLANGE CONNECTION 4 MOUNTING BRACKET CAN BE ROTATED OR REVERSED AS NECESSARY TO SATISFY INSTALLATION REQUIREMENTS 3 TORQUE BOTTOM PLATE CAP SCREWS TO 35 FT LB 47 N m 2 TORQUE MOUNTING BRACKET NUT TO 147 5 FT LB 200 N m 1 ALL DIMENSIONS ARE 0 13 IN 3 2 MM UNLESS OTHERWISE NOTED Figure 6 2 Model 351 sensor 3000 psi 20 7 MPa ...

Страница 30: ...30 Section 6 Model 351 352 353 Liquid Level Systems Figure 6 3 Model S048 sensor ...

Страница 31: ...BLE WITH 9 LONG 1 SCHEDULE 160 PIPE 4 MOUNTING BRACKET CAN BE ROTATED OR REVERSED AS NECESSARY TO SATISFY INSTALLATION REQUIREMENTS 3 TORQUE BOTTOM PLATE CAP SCREWS TO 35 FT LB 47 N m 2 TORQUE MOUNTING BRACKET NUT TO 147 5 FT LB 200 N m 1 ALL DIMENSIONS ARE 0 13 IN 3 2 MM UNLESS OTHERWISE NOTED Figure 6 4 Model 353 sensor 3000 psi 20 7 MPa ...

Страница 32: ...32 Section 6 Model 351 352 353 Liquid Level Systems ...

Страница 33: ... WARRANTY IS IN LIEU OF AND EXCLUDES ALL OTHER EXPRESSED OR IMPLIED WARRANTIES OF MERCHANTABILITY OR FIT NESS FOR A PARTICULAR PURPOSE OR OTHERWISE 2 Components manufactured by any supplier other than Cameron shall bear only the warranty made by the manufacturer of that product and Cameron assumes no respon sibility for the performance or reliability of the unit as a whole 3 In no event shall Came...

Страница 34: ...34 Section 6 Model 351 352 353 Liquid Level Systems ...

Страница 35: ...35 ...

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