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Fisher 4195K Gauge Pressure Indicating Controllers

Fisher 4195K Gauge Pressure Indicating Controllers
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Fisher 4195K Gauge Pressure Indicating Controllers - 1

Product Bulletin Fisherr 4195K Gauge Pressure Indicating Controllers Fisher 4195K gauge pressure indicating controllers show process pressure and set point on an easy‐to‐read process scale. The controllers compare process pressure with an operator‐adjusted set point and delivers a pneumatic signal to a control element so that process pressure changes toward the set point. Controller types are available for proportional‐only, proportional‐plus‐reset, proportional‐plus‐reset‐ plus‐rate, and differential gap for on‐off control. 4195K controllers are used in industries where accurate pressure control and process monitoring are required. Unless otherwise noted, all NACE references are to NACE MR0175-2002. INTERIOR OF A FISHER 4195KBME CONTROLLER W5663‐1 YOKE‐MOUNTED CONTROLLER Notes: 1 An internal cover protects the proportional band adjustment mechanism. In this photograph, the cover has been removed. 2 Controller components are indicated in figure 1.

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Fisher 4195K Gauge Pressure Indicating Controllers - 2

Product Bulletin Specifications Supply Pressure Medium Available Configurations Remote Set Point Pressures Process Sensor Range (Input Signal) Lower and Upper Range Limits: As shown in tables 2 and 5 Maximum Allowable Pressure: As shown in tables 2 and 5 (6 to 30 psig) Construction Materials See table 6 Process Scale Controller Adjustments Standard scale is matched to the range of the sensing element, with exception of receiver controllers. Optional scales available(1). Proportional Band: 5 to 500% of process scale span Reset: Adjustable from 0.01 to more than 74 minutes per repeat (from...

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Fisher 4195K Gauge Pressure Indicating Controllers - 3

Product Bulletin Specifications (continued) Exhaust Capacity(4) 0.2 to 1.0 Bar (3 to 15 Psig) Output: 5.0 m3/hr (186 scfh) 0.4 to 2.0 Bar (6 to 30 Psig) Output: 7.9 m3/hr (295 scfh) Operative Ambient Temperature Limits(2)(6) -40 to 71_C (−40 to 160_F) Designed to NEMA 3 (Weatherproof) and IEC 529 IP54 Specifications Hazardous Area Classification Complies with the requirements of ATEX Group II Category 2 Gas and Dust Controller can be mounted on J actuator, J panel, J wall, or J pipestand Approximate Weight 4.5 kg (10 pounds) NOTE: Specialized instrument terms are defined in ANSI/ISA...

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Fisher 4195K Gauge Pressure Indicating Controllers - 4

Product Bulletin 34.5:4195K July 2014 Features n Easy Maintenance—Simple design allows fast, easy maintenance and minimal spare parts inventory. Construction Features Simplified Relay Maintenance A clean‐out wire provides a fast, easy means of cleaning the relay primary orifice during service. n Easy Adjustment—Adjusting the set point, the zero and span of the process pointer, and switching between direct and reverse action are accomplished quickly and without special tools. Additionally, the set point and proportional band can be adjusted with no interaction between the two adjustments....

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Fisher 4195K Gauge Pressure Indicating Controllers - 5

Product Bulletin Table 2. Process Sensor (Capsular Element) Pressure Ratings CAPSULE MATERIAL CAPSULAR STANDARD RANGES Positive pressure Metric units Compound N09902 Nickel Alloy Positive pressure 0 to 150 mbar 0 to 400 mbar 0 to 0.6 bar 0.2 to 1 bar 0 to 1 bar 0 to 1.4 bar 0 to 1.6 bar 0.4 to 2 bar 0 to 2 bar -150 to 0 mbar -340 to 0 mbar -400 to 0 mbar -0.6 to 0 bar -1 to 0 bar -50 to 100 mbar -175 to 175 mbar -150 to 250 mbar -0.2 to 0.4 bar -0.4 to 0.6 bar -0.6 to 0.8 bar -1 to 0.6 bar -1 to 1 bar 0 to 60 inch wc 0 to 5 psig 0 to 10 psig 3 to 15 psig 0 to 15 psig 0 to 20 psig 6 to 30...

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Fisher 4195K Gauge Pressure Indicating Controllers - 6

Product Bulletin Table 5. Process Sensor (Bourdon Tube) Pressure Ratings and Materials BOURDON TUBES STANDARD MATERIAL Metric units Standard Material 1. Minimum or maximum span or any span in between may be positioned anywhere within the operating range. For example, if a 0 to 2 bar (0 to 30 psig) sensing element is used and the minimum span of 1 bar (15 psig) is set, the process indication can be calibrated to a range of 1 to 0 bar (30 in. Hg to 0 psig), 0 to 1 bar (0 to 15 psig), 1 to 2 bar (15 to 30 psig), 2 to 3 bar (27 to 42 psig) or any value between minimum and maximum values of...

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Fisher 4195K Gauge Pressure Indicating Controllers - 7

Product Bulletin D200050X012 Figure 1. Controller Construction Details METAL BALL SWITCHING ZONE INDICATOR LOADER KNOB AUTO/MANUAL SWITCH W3679 AUTO/MANUAL STATION SET POINT INDICATOR PROCESS PRESSURE INDICATOR 3 INPUT ELEMENT (BOURDON TUBE) REMOTE SET POINT ASSEMBLY PROPORTIONAL BAND ADJUSTMENT 2 ZERO ADJUSTMENT RELAY POINTER SPAN ADJUSTMENT ADJUSTABLE RELIEF VALVE (ANTI‐RESET WINDUP) SUPPLY PRESSURE GAUGE OUTPUT PRESSURE GAUGE SET POINT SPAN ADJUSTMENT INPUT ELEMENT (CAPSULAR ELEMENT) RESET ADJUSTMENT (PROPORTIONAL‐PLUS‐RESET CONTROLLERS ONLY) RATE ADJUSTMENT RESET ADJUSTMENT FOR...

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Fisher 4195K Gauge Pressure Indicating Controllers - 8

Product Bulletin 34.5:4195K July 2014 Principle of Operation Refer to the schematic diagrams in figures 2, 3, and 4. Refer to table 1 for a complete description of type number suffixes. Proportional‐Only Controllers (4195KA) The input element is connected to the process pointer and to the flapper by connecting links. As the process pressure increases (in a direct‐acting controller), the flapper moves toward the nozzle, restricting flow through the nozzle and increasing nozzle pressure. When this occurs, relay action increases the output pressure (delivery) of the controller. Output pressure...

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Fisher 4195K Gauge Pressure Indicating Controllers - 9

Product Bulletin D200050X012 Figure 2. Schematic of Fisher 4195K Controllers MANUAL SET POINT ADJUSTMENT RESET BELLOWS (VENTED) PROPORTIONAL BELLOWS REVERSE ACTION QUADRANT PROPORTIONAL BAND ADJUSTMENT PROCESS POINTER REMOTE SET POINT CONNECTED HERE FEEDBACK LINK FEEDBACK MOTION INPUT ELEMENT CONNECTED HERE FLAPPER PIVOT DIRECT ACTION QUADRANT CONNECTING LINK INPUT MOTION FLAPPER DETAIL BEAM OUTPUT PRESSURE TO FINAL CONTROL ELEMENT FLAPPER NOZZLE RELAY SUPPLY PRESSURE TO TO NOZZLE RESET BELLOWS PROPORTIONAL‐ONLY CONTROL OUTPUT PRESSURE TO FINAL CONTROL ELEMENT TO PROPORTIONAL BELLOWS RESET...

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Fisher 4195K Gauge Pressure Indicating Controllers - 10

Product Bulletin 34.5:4195K July 2014 controller to respond to the change quickly with high gain, but not long enough for the high gain to cause instability. Then, the low gain provided by the proportional action keeps the system stable. Finally, reset action slowly increases the gain and returns the process pressure toward the set point. Differential Gap (For On‐Off Control) Controllers (4195KS) The operation of differential gap controllers (4195KS) is similar to that of proportional‐only controllers (described above). However, in 4195KS controllers, as the process pressure increases,...

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