Operating Principles

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Norma West
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1 Features Explosion-proof NEMA 4X, IP65, Type 4 enclosure for outdoor and indoor installations. Optional tapped exhaust port vents exhaust gas. Canadian Registration Numbers (CRN) certification for all territories and provinces. Does not contain copper-based metals. Compact size for use in restricted areas. Internal electronic feedback maintains precise output pressure control. Piezoelectric actuator disk provides stability regardless of vibration or position. RFI/EMI protection eliminates susceptibility to elecromagnetic interference. Optional version approved for use with Natural Gas or Industrial Methane as a supply media. Encapsulated critical components designed to make unit moisture resistant in tough environments Operating Principles The Transducer is an electronically controlled pressure sensitive device that converts a current signal to a pneumatic output. This device is composed of the Primary Converting Section and the Relay Section. The Piezoelectric ceramic disk in the Primary Section functions as a flapper. The flapper and the nozzle work together to control the signal pressure in the Relay Section. The signal pressure acts on a diaphragm assembly that controls the pressure in the output chamber. The output pressure is sensed by the lower control diaphragm to maintain the output pressure. The output pressure is also sensed by the feedback control circuit, which compares the output pressure and input signal (setpoint) to maintain constant output pressure. The Damping Adjustment on the PC oard allows tuning the transducer for optimum response and stability. Large downstream volumes generally require more damping to achieve output pressure stability. 2 3/

2 Specifications [AR] SET POINT [0.2] [0.6] [.0] [2.0] (20) (60) (00) (200) Maximum Air Consumption SCFH (.0 m 3 /HR) (.20 m 3 /HR) (.27 m 3 /HR) (.38 m 3 /HR) Flow Rate 2.5 (4.25 m 3/ 9.0 (5.3 m 3 (SCFM) 25, [.7 AR], 20, [8.0 AR], (70 kpa) supply & OR (800 kpa) supply & 9, [0.6 AR], 9, [0.6 AR], (60 kpa) Output (60 kpa) Output Temperature Range Operating o F to + 60 o F, (-40 o C to o C) Operating o F to + 60 o F, (-23 o C to o C) Storage 7800/ o F to + 80 o F, (-40 o C to o C) Span/Zero Adjustments Screwdriver adjustments located under cover [AR] OUTPUT RANGE [0.2-.0] [0.2-.8] [ ] (20-00) (20-80) (40-200) Input Range 4-20 ma Supply Pressure, [.5-8.0] [ ] [ ] (50-800) ( ) ( ) Minimum Span [0.35] [0.7] [0.7] (35) (70) (70) Frequency Response -3 5 Hz per ISA S load configuration A. Required Operating Voltages ma (4-20 ma signal) Accuracy (ISA S5.) 0.25% Full Scale Guaranteed 0.5% Full Scale Typical Hysteresis (ISA S5.) 0.% Full Scale Deadband 0.02% Full Scale Repeatability (ISA S5.) 0.% Full Scale Position Effect No Measurable Effect Vibration Effect Less than ±% of Span under the following conditions: inches constant displacement Gs. Reverse Polarity Protection RFI/EMI Effect Supply Pressure Effect Temperature Effect Materials of Construction No damage occurs from reversal of normal supply current (4-20 ma) or from misapplication of up to 60 ma. Less than 0.5% of 30 v /m class 3 and AC ( mhz) per SAMA PMC and less than 0.5% of 0 v /m level, to 2 GHz and per EN :998 +A EMC Directive 89/336/EEC European Norms EN 6326 No Measurable Effect [+0.5% +0.04% / o F Temperature Change] of Span typical ody and Housing Chromate Treated Aluminum Orifice Aluminum & Sapphire Trim Stainless Steel & Zinc Plated Steel Elastomers Nitrile Finish Epoxy Powder Coating Supply Pressure must be no less than 5, [0.35 AR], (35 kpa), above maximum output. 2 Atex Approved unit 40, [2.8 AR], (280 kpa). Atex Approved unit with N option 20, [8.0 AR], (800 kpa) for Air or Group IIA gases. 3

3 Extended Range Specifications [AR] SET POINT [0] [.0] [2.0] [4.0] [8.0] (0) (00) (200) (400) (800) Maximum Air Consumption SCFH (.09 m 3 /HR) (.22 m 3 /HR) (.33 m 3 /HR) SCFH (0.4 m 3 /HR) (.3 m 3 /HR) (.22 m 3 /HR) (.37 m 3 /HR) SCFH (.0 m 3 /HR) (. m 3 /HR) (.2 m 3 /HR) (.42 m 3 /HR) Flow Rate (SCFM).0 (8.7 m 3 50, [0 AR], (000 kpa) supply & midscale output Temperature Range Operating o F to + 60 o F, (-40 o C to o C) Operating -0 o F to + 60 o F, (-23 o C to o C) Storage -40 o F to + 80 o F, (-40 o C to o C) Span/Zero Adjustments Screwdriver adjustments located on front of unit Required Operating Voltages Two Wire Current Input ma (4-20 ma signal) Supply Voltages Three Wire Voltage Input VDC, less than 3 ma Signal Impedance Three Wire Voltage Input 0 Kilohms Input Range 4-20 ma DC, 0-0 VDC, -9 VDC Supply Pressure [2.4-0] [4.6-0] [8.8-0] ( ) ( ) (880-00) Minimum Span [0.85] [.5] [3.0] (85) (50) (300) Frequency Response -3 2 Hz per ISA S load configuration A. Accuracy (ISA S5.) 0.25% Full Scale Guaranteed 0.5% Full Scale Typical Hysteresis (ISA S5.) 0.25% Full Scale Deadband 0.02% Full Scale Repeatability (ISA S5.) 0.% Full Scale Position Effect 90 0 & 80 0 Vibration Effect Less than +% of Span under the following conditions: inches constant d isplacement Gs. Reverse Polarity Protection No damage occurs from reversal of normal supply current (4-20 ma) or from misapplication of up to 60 ma. RFI/EMI Effect Supply Pressure Effect Temperature Effect Materials of Construction [AR] OUTPUT RANGE [0-2.0] [0-4.0] [0-8.0] (0-200) (0-400) (0-800) Less than 0.5% of 30 v /m class 3 a nd AC ( mhz) per SAMA PMC and less than 0.5% of 0 v /m level, to 2 GHz and per EN :998 +A EMC Directive 89/336/EEC European Norms EN 6326 < 0. change for 0 supply change [+0.5% % / o F Temperature Change] of Span typical ody and Housing Chromate Treated Aluminum Orifice Nickel Plated rass & Sapphire Trim Stainless Steel, rass & Zinc Plated Steel Elastomers Nitrile Finish Epoxy Powder Coating Supply Pressure must be no less than 5, [0.35 AR], (35 kpa), above maximum output 2 Atex Approved unit 40 [2.8 AR] (280 kpa); Atex Approved unit with N option 20 [8.0 AR] (800 kpa) for Air or Group!!A Gases 4

4 Hazardous Area Classifications Explosion-Proof Intrinsically Safe Factory Mutual Air as supply pressure media Air as supply pressure media (FM) Approvals Class I, Division, Groups, C and D; Class I, Division I, Groups C and D; Class II, Division, Groups E, F and G; Class II, Division, Groups E, F and G; Class III, Division, Fibers; Class III, Division ; Fibers; Class I, Division 2, Groups A,, C and D; NEMA 4X Enclosure; NEMA 4X Enclosure; Max. Ambient 65 o C; Temperature Code T4. Max. Ambient 6 5 o C ; Temperature Code T5. Entity Parameters Group D gases, including Natural Gas as supply pressure media Class I, Division, Groups C and D; Class II, Division, Groups E, F and G; Class I, Division 2, Groups A,, C and D; Canadian Standards Air as supply pressure media Air as supply pressure media Association (CSA) Class I, Division, Groups, C and D; Class I, Division, Groups C and D; Approvals Class II, Division, Groups E, F and G; Class II, Division, Groups E, F and G; Class I, Division 2, Groups A,, C and D; Type 4X Enclosure; Temperature Code T4; Type 4X Enclosure; Temperature Code T5; Max. Ambient 6 5 o C. Group D gases, including Natural Gas as supply pressure media Class I, Division, Groups C and D; Class II, Division, Groups E, F and G; Class I, Division 2, Groups A,, C and D. Factory Sealed Flame-Proof Vmax = 30 VDC Imax 2 = 200 ma Rated 4-20 ma, 30 VDC maximum. Approvals are valid when connected through a Shunt Zener Diode Safety arrier meeting the following parametric requirements: System Type : Single Channel Polarized Rated: 28.5V Max. 300 Ohm Min. System Type 2: Dual Channel Polarized Rated 28.5V Max. 300 Ohm Min. and 28V Diode return per channel System Type 3: Dual Channel Polarized Rated: 28.5V Max. 300 Ohm Min. and 0V Max. 50 Ohm Min. Intrinsically Safe Ci 3 = O µ F Li 4 = O mh Vmax = Max. Voltage 3 Ci = Capacitance 2 Imax = Max. Current 4 Li = Inductance Explosive Air as supply pressure media Air as supply pressure media Atmospheres II 2 GD II G (T4) IID (T 85 o C) Directive (ATEX) EEx d II + H 2, T5 (-20 o Cto+65 o C)Ambient; EEx ia II, T4 (-20 o Cto +72 o C ) Ambient; Approvals * IP65 Enclosure. IP65 Enclosure. Group IIA gases, including Natural Gas as supply pressure media II 2 GD EEx d II, T5 (-20 o Cto+65 o C)Ambient; IP65 Enclosure. * Transducer Parameters Umax = 28 V Pi 3 = 0.7 W L i 5 = 0 Imax 2 = 00 ma Ci 4 = 0 max = Max. Voltage 3 Pi = Max. Power 5 Li = Inductance 2 Imax = Max. Current 4 Ci = Capacitance 5

Mounting Kit 2 3/64 56.0 Transducer Kits & Accessories Mounting racket Kits.

5 Mounting Kit 2 3/ Transducer Kits & Accessories Mounting racket Kits : TCXI, TFXI (sold separately) 902-2: TEXI (sold separately) Catalog Information Catalog Number T X I Underwriting Group Canadian Standard C ATEX E Factory Mutual F Temperature Range -40 F to +60 F F to +60 F Input 4-20 ma Output [ AR] [ AR] [ AR] [0-2.0 AR] [0-4.0 AR] [0-8.0 AR] (20-00 kpa) (20-80 kpa) ( kpa) (0-200 kpa) (0-400 kpa) (0-800 kpa) Options Tapped Exhaust E Natural Gas media approval, Group D gases N (Includes Nipple; TCXI, TEXI, TFXI only), 2 SPT Thread U 4 20 ft cable length ft cable length ft cable length Not approved for Intrinsically Safe. 2 Tapped Exhaust option required. 3 Available for ATEX only. NOT available with N Option. 4 0 ft cable standard. Longer lengths available. Contact factory for details and availability. Installation For installation instructions, refer to the Fairchild Explosion-proof Electro-pneumatic Transducer Installation, Installation Instructions, II For operation and maintenance instructions, refer to the Fairchild Explosion-proof Electro-pneumatic Transducer Operation and Maintenance Instructions, OM

All TXI7850 products are ROHS compliant.

All TXI7850 products are ROHS compliant. Features Explosion-proof NEMA 4X, IP65, Type 4 enclosure for outdoor and indoor installations. Optional tapped exhaust port vents exhaust gas. Canadian Registration Numbers (CRN) certification for all