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Instruction Manual

D103032X012

L2 Controller

July 2015

16

Key

Description

 6

Span Lever Assembly, stainless steel

 7

Shoulder Screw, stainless steel (2 req'd)

 8

Flanged Bearing, nylon (4 req'd)

 9

Span Adjustor, stainless steel

10

Pressure Gauge (2 req'd)

11

Mounting Screw, stainless steel (4 req'd)

12

Cover Screw, stainless steel

13*

O‐Ring

(1)

, nitrile

14

Filter Cap, reinforced PMMA (polymethylmethacrylate)

15

Filter

16*

O‐Ring

(1)

, nitrile

17

Machine Screw, stainless steel (2 req'd)

18*

Sensor Gasket

(1)

, composition

19

Cover, marine grade aluminum

20

Cover Lens, PMMA (polymethylmethacrylate) (2 req'd)

21*

Gasket

(1)

, chloroprene (2 req'd)

22

Retaining Ring, steel (2 req'd)

23*

Cover Gasket

(1)

, nitrile

33

Relay Mounting Screw

(2)

, stainless steel (2 req'd)

43*

Relay Mounting O‐Ring

(2)

, nitrile (not shown)

44*

Relay Mounting O‐Ring

(2)

, nitrile (not shown)

49

Relay Adjustment Screw

51

Valve Assembly

52

Valve Assembly O‐Ring

53

Label, setup and calibration

54

Self‐Tapping Screw, stainless steel (2 req'd)

55

Nameplate

56

Screen, stainless steel

Key

Description

57

Hex Nut, stainless steel

60

Anti‐seize sealant
 (not furnished with controller)

61

Lubricant, silicone sealant
 (not furnished with controller)

62

Thread locking adhesive, medium strength
 (not furnished with controller)

84

Adhesive, industrial grade cyanoacrylate

85

Nameplate, ATEX

Sensor

81

Displacer, 1‐7/8x12‐inches
 PVC
 S31603 SST

63

Hex Nut, 316 SST

64

Displacer Rod, 17‐4 SST (17‐4PH SST)

65

Sensor Connection

66

Spacer, 304 SST

67

Hex Nut, 316 SST

68

Conical Spring, 316 SST

69

Universal Joint, 316 SST (vertical displacer only)

70

Nameplate

71

Drive Screw, stainless steel

72

Pivot Body, CB7CU‐1 (17‐4PH SST)

73

Pivot Base, CF8M (316 SST)

74*

O‐Ring

(3)

, fluorocarbon

75*

Anti‐Extrusion Ring

(3)

, PTFE

76

Retaining Ring, 304 SST

77*

O‐Ring

(3)

, fluorocarbon

78*

Backup Ring

(3)

, fluorocarbon

79

Lithium grease
 (not furnished with sensor)

80

Instruction Tag

82

Extension, S31600

*Recommended spare parts

1. Included in Controller Repair Kit
2. Included in Relay Repair Kit
3. Included in Sensor Repair Kit

Emerson Process Management 

Marshalltown, Iowa 50158 USA
Sorocaba, 18087 Brazil
Chatham, Kent ME4 4QZ UK
Dubai, United Arab Emirates
Singapore 128461 Singapore

www.Fisher.com

The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not
to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are
governed by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such
products at any time without notice.

E

 

2001, 2015 Fisher Controls International LLC. All rights reserved.

Fisher is a mark owned by one of the companies in the Emerson Process Management business unit of Emerson Electric Co. Emerson Process Management,
Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective owners.

Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance
of any product. Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.

Summary of Contents for Fisher L2

Page 1: ...mbly 11 Assembly 13 Replacing the Controller Relay 13 Replacing the Controller Supply Filter 13 Figure 1 Fisher L2 Liquid Level Controller W8418 1 Related Documents 14 Parts Ordering 14 Parts Kits 14 Parts List 14 Controller 14 Sensor 16 Introduction Scope of Manual This instruction manual includes installation adjustment maintenance and parts ordering information for the Fisher L2 liquid level co...

Page 2: ... 15 psig output signal and 2 4 bar for 0 4 to 2 0 bar output signal 35 psig for 6 to 30 psig output signal On Off Any desired pressure between 1 4 and 3 4 bar 20 and 50 psig Snap Acting Controller Any desired pressure between 1 4 and 5 2 bar 20 and 50 psig direct and 1 4 bar and 2 4 bar 20 and 35 psig reverse Do not use supply pressure below 1 4 bar 20 psig Supply Medium Air or natural gas 4 Stead...

Page 3: ...avity differential with standard displacer is 0 4 Minimum specific gravity differential of 0 1 is possible with special displacer consult your Emerson Process Management sales office for displacer sizing information 4 This product can be used with natural gas as the supply medium 5 Normal m3 hr Normal cubic meters per hour 0_C and 1 01325 bar absolute Scfh Standard cubic feet per hour 60_F and 14 ...

Page 4: ...RNING at the beginning of the Maintenance section of this instruction manual CAUTION If the L2 level controller is installed on a vessel that is to be shipped to a different location e g skid mounted units remove the displacer and displacer rod extensions before shipment Failure to do so could result in damage to the displacer rod due to vibration and impact loading during shipment After the vesse...

Page 5: ...G Personal injury or property damage may occur from an uncontrolled process if the supply medium is not clean dry oil free air or non corrosive gas While use and regular maintenance of a filter that removes particles larger than 40 micrometers in diameter will suffice in most applications check with an Emerson Process Management field office and industry instrument air quality standards for use wi...

Page 6: ...m 1 2 inch diameter pipe for the remote vent pipe Check the vent periodically to be certain it is free of any obstructions Changing Controller Action or Mode WARNING To avoid personal injury caused by a sudden release of pressure shut off the supply pressure and bleed pressure from the supply lines before performing any procedure in this section Throttling and On Off Controller The action of a thr...

Page 7: ...CREWS SWITCH RETENTION SCREWS 1 NOTE 1 ALL FOUR SWITCH RETENTION SCREWS SHOWN ONLY ON THIS VIEW OTHER VIEWS SHOW ONLY TWO SWITCH RETENTION SCREWS IN ORDER TO ILLUSTRATE THE SWITCH CONFIGURATION B2339 1 Figure 4 Fisher L2 Snap Acting Controller Switch Positions for Changing Action SWITCH RETENTION SCREWS SWITCH RETENTION SCREWS DIRECT ACTION REVERSE ACTION NOTE 1 ALL FOUR SWITCH RETENTION SCREWS SH...

Page 8: ... MOST SENSITIVE POSITION FOR THROTTLING AND ON OFF CONTROLLER MAXIMUM SPAN LEAST SENSITIVE POSITION FOR SNAP ACTING CONTROLLER LEVER A CONTACTING THE DISPLACER ROD GB0137 2 E0787 LEVER A LEVER B SPAN LEVER GAP Preliminary Checks 1 Check the supply pressure gauge key 10 to be certain that the supply pressure is at the desired value Adjust the supply pressure as required 2 Adjust the displacer rod t...

Page 9: ...below the bottom of the displacer or at the lowest desired operating point on the displacer 3 Adjust the spring adjustment key 4 until the output is 16 to 17 psig for a 3 to 15 psig output range or 31 to 34 psig for a 6 to 30 psig output range Direct Acting On Off and Snap Acting Controllers 1 Make certain the Preliminary Checks procedure at the start of this section has been completed 2 Lower the...

Page 10: ...e increases causing a force imbalance between the zero spring relay and displacer forces This force imbalance is transmitted to the relay by levers A and B The relay compensates for the force imbalance by converting it to a pressure output to a control valve and bringing the forces back into equilibrium Figure 6 Operational Schematic DISPLACER ROD LEVER B PROPORTIONAL BAND ADJUSTMENT PIVOT POINT O...

Page 11: ... for the process before taking the controller out of service D Provide a means of containing the process fluid before removing any measurement devices from the process D Vent any trapped process pressure D Check with your process or safety engineer for any additional measures that must be taken to protect against process media Removing the Controller From the Sensor 1 Disconnect the supply and out...

Page 12: ... the pivot base key 73 retaining ring key 76 anti extrusion ring key 75 and O ring key 74 off the displacer rod Remove the O ring key 77 and backup ring key 78 from the pivot base Figure 7 Sensor GB0139 C sht 1 VIEW C C VIEW B SECTION A A C C A A B APPLY LUB SEALANT ...

Page 13: ...s possible while pushing the pivot base into the sensor connection Be sure the pivot base seats in the slots cast in the sensor connection 7 Slide the spring key 68 and spacer key 66 onto the displacer rod and secure with the hex nut key 67 Fully tighten the hex nut key 67 8 View the sensor connection from the vessel side Ensure that the pivot body arms remain aligned with the pivot base arms the ...

Page 14: ...8 WARNING Use only genuine Fisher replacement parts Components that are not supplied by Emerson Process Management should not under any circumstances be used in any Fisher instrument Use of components not supplied by Emerson Process Management may void your warranty might adversely affect the performance of the valve and could cause personal injury or property damage Parts Kits Description Part Nu...

Page 15: ...oller July 2015 15 Figure 8 Fisher L2 Liquid Level Controllers VIEW A A SNAP ACTING CONTROLLER THROTTLING AND ON OFF CONTROLLER RELAY ASSY APPLY LUB SEALANT GB0137 D SNAP ACTING CONTROLLER RELAY ASSEMBLY THROTTLING AND ON OFF CONTROLLER A A ...

Page 16: ... 71 Drive Screw stainless steel 72 Pivot Body CB7CU 1 17 4PH SST 73 Pivot Base CF8M 316 SST 74 O Ring 3 fluorocarbon 75 Anti Extrusion Ring 3 PTFE 76 Retaining Ring 304 SST 77 O Ring 3 fluorocarbon 78 Backup Ring 3 fluorocarbon 79 Lithium grease not furnished with sensor 80 Instruction Tag 82 Extension S31600 Recommended spare parts 1 Included in Controller Repair Kit 2 Included in Relay Repair Ki...

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