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Instruction Manual

D103032X012

L2 Controller

July 2015

Span Adjustment

Except where indicated, key numbers referenced in the following procedures are shown in figure 8. The span levers
and other proportional band information are shown in figure 5.

Figure 5. Proportional Band Adjustments

MAXIMUM SPAN (LEAST SENSITIVE) POSITION FOR
THROTTLING AND ON/OFF CONTROLLER. MINIMUM SPAN
(MOST SENSITIVE) POSITION FOR SNAP‐ACTING
CONTROLLER

MINIMUM SPAN (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 to the horizontal position with the spring adjustment (key 4).

3. Bounce the end of the displacer rod (key 64, figure 7) up and down to check that the sensor is operating freely.

4. Place the span adjuster (key 9) at the desired position (see figure 5).

Содержание Fisher L2

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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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