Pneumatic Transmitters Model 33 Nullmatic™ Temperature Transmitter Introduction Features & Benefits Rugged design ensures operation in the harshest environments Powder coating provides corrosion resistance Wide ranges of temperature spans and temperature ratings provides application versatility Description Model 33 Nullmatic Temperature Transmitters measure temperature to 1400°F (760° C), with measured spans as small as 50° or as large as 1000°F. Moreover, the Model 33 employs a pilot-operated null-balance principle or operation, which maintains the output pressure regardless of wide changes in flow or supply pressure. As such, they provide temperature measurements and transmit a pneumatic output proportional to the measured temperature range for vessels, reactors, fractionating columns, heat exchangers, pipelines, air ducts, and flues. Each Model 33 includes a helium-filled thermal system and a Nullmatic force-balance transmitter. The force-balance transmitter converts pressure changes in the thermal system caused by changes in temperature to 3-15 psig output signals proportional to the measured temperature range. The thermal system includes a bulb with a bendable extension, a flexible armored capillary, and a bellows. Three kinds of bulbs are available for use with a thermal system and all are made of 316 stainless steel or copper. A circuit maintains a constant differential-pressure-drop across the nozzle with the differential determined by the force of the spring under the diaphragm. This maintains the transmitter’s total internal bellows movement within 0.001", which ensures that it is accurate under virtually any condition and it minimizes hysteris and non-linearity errors. Specifications Temperature Span1 3/4" O.D. and averaging bulbs Minimum: 50°F (30°C) Maximum: 1000°F (540°C) 3/8" O.D. Bulbs Minimum: 70°F (40°C) Maximum: 1000°F (540°C) Operating Temp. Limits 3/4" O.D. and averaging bulbs Minimum: -450°F (-270°C) Maximum: 1400°F (760°C) 3/8" O.D. bulbs Minimum: -450°F (-270°C) Maximum: 1000°F (540°C) Maximum Bulb Operating Temperature2 Bulb Size: 3/4 x 4" Copper: 800°F (427°C) SS: 1400°F (760°C) Bulb Size: 3/8 x 4" Copper: 800°F (427°C) SS: 1000°F2 (540°C) Minimum Bulb Operating Temperature -450°F (-270°C) Supply Pressure Normal: 20 psig (3-15 psi output) Maximum: 35 psig Minimum: 4 psi above maximum output 8 Output Pressure 3-15 psig (within 1%3) Output Range 3–15 psig 3-27 psig and 0-30 psig output ranges are available Connections 1/4" NPT for supply and output Ambient Temp. Limits -40 to 180°F (-40 to 82°C) 8.19 Pneumatic Transmitters Model 33 Nullmatic™ Temperature Transmitter Technical data Order No. Response level Model Number within 0.01% of full scale Basic Transmitter Model Number 33■ ■ ■ ▲ ▲ ▲ Air consumption (with 20 psi supply) less than 0.08 scfm in balanced condition on dead-end service Speed of Response4,5 (with transmitter coupled through 100 ft. of 1/4" OD tubing to receiver – element immersed in agitated water) Bare SS bulb: 0.03 minutes 3/8" SS bulb in SS well: 0.3 minutes 3/4" OD SS bulb in SS well: 0.7 minutes Ambient Temperature Effect (max. change in output for -50°F change in ambient temperature) less than 1% of full-scale shift on most ranges Designator for Mating Transmitters and Thermal Systems • Spans of 250 to 1000°F • Spans of 150 to 800°F • Spans of 100 to 475°F • Spans of 70 to 250°F • Spans of 50 to 70°F C A C D E SE Thermal System Number Thermal System Bulb Bulb Material Diameter Type Copper Copper 316 SS 316 SS 316 SS 316 SS 316 SS 316 SS Copper 316 SS 316 SS Copper 316 SS Copper 316 SS 316 SS 3/4" 3/4" 3/4" 3/4" 3/4" 3/4" 3/4" 3/4" 3/4" 3/16" 3/8" 3/8" 3/8" 3/8" 3/8" 3/8" Factory Code Bulb Bulb Bendable Armored Overall Active Extension Capillary Length Length Length Length Plain 4" Rigid 6" Plain 4" Rigid 6" Plain 4" Non-Rigid 4" Plain 4" Rigid 6" Non-Rigid 4" Extendable 14" Plain 4" Plain 4" Rigid 11-1/4" Rigid 11-1/4" Plain 4" Plain 4" 4" 4" 4" 4" 4" 4" 4" 4" 4" 14" 4" 4" 4" 4" 4" 4" 20" None 20" None 20" 20" 20" None 20" 20" 24" 24" None None 24" 24" 36" 36" 36" 36" 36" PVC 36" 120" 120" 36" 36" 36" 36" 36" 36" 36" PVC 120" 5012 5048 5072 5079 5081 5098 5142 5257 5287 5341 5475 5476 5477 5478 5479 5580 (C7C) 8 1) Certain spans can be used to 1400°F with factory approval. 2) Materials contacting process fluid – stainless steel standard bulbs and wells; special materials available at extra cost. Metallic materials can be ordered to conform with NACE standard MR-01-75 (1980 Revision). 3) Instruments which have been calibrated to within ½% are available, at extra cost. 4) With 500 ft. transmission line, lag times will increase approximately 0.07 minutes. 5) These time constants are the lag times required for 63.2% response. 8.20 Pneumatic Transmitters Model 33 Nullmatic™ Temperature Transmitter Technical data TABLE 1 Fahrenheit Selection Maximum Operating Temperature °F 1,2,3 Model Bulb Dia. Com. Spans °F 50 60 70 80 90 100 110 120 125 130 140 150 160 170 175 180 190 200 225 250 275 300 325 350 375 400 425 450 475 500 600 700 800 900 1000 33A 3/8" — — — — — — — — — — — — — — — — — — — 260 330 400 480 550 620 700 770 840 890 940 1000 1000 1000 1000 1000 33C 3/4" Aver 3/8" — — — — — — — — — — — — — — — — — — — 255 325 400 470 540 610 680 750 820 890 960 1230 1300 1400 1400 — — — — — — — — — — — — 150 190 230 250 270 305 340 440 500 550 610 665 715 765 820 870 920 970 1000 — — — — — 33D 3/4" Aver 3/8" — — — — — — — — — — — 150 190 230 250 270 310 350 450 550 650 750 850 950 1000 1125 1215 1285 1380 1400 1400 1400 1400 — — — — — — — 100 150 200 225 250 300 350 400 440 460 470 500 520 580 640 700 750 810 870 920 980 — — — — — — — — — Maximum Overrange °F 33E 3/4" Aver 3/8" — — — — — 100 165 220 250 280 335 395 450 510 540 565 620 680 825 970 1000 1000 1000 1000 1000 1400 1400 1400 1400 — — — — — — — — 150 200 230 270 290 320 330 360 390 430 450 480 500 520 540 570 640 700 — — — — — — — — — — — — — — — 33SE 3/4" Aver — — — 200 286 370 465 550 590 635 720 805 890 975 1000 1000 1000 1000 1000 1000 — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — 3/8" Bulbs (copper bulb limit - 800°F) 3/4" Aver 33A 33C 33D 33E 100 250 370 — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — 650 750 850 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 — — — — — — — — — — — 650 710 770 800 830 890 950 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 — — — — — 625 900 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 — — — — — — 650 825 975 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 — — — — — — — — — — * All 316 SS, 3/4", Aver - 1400°F All Cu. 3/4" - 800°F 1) Maximum operating temperature for Copper Bulbs is 800°F. 2) Transmitter must be selected from first column (read left to right) of maximum operating temperatures which satisfy range requirements. 3) Thermal systems are not interchangeable between different lettered transmitters. 8.21 8 Pneumatic Transmitters Model 33 Nullmatic™ Temperature Transmitter Technical data TABLE 2 Celsius Selection Maximum Operating Temperature °C 1,2,3 Model Bulb Dia. Com. Spans °C 28 30 35 40 45 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 225 250 275 300 350 400 500 556 33A 33C 33D Maximum Overrange °C 33E 3/8" 3/4" Aver 3/8" 3/4" Aver 3/8" 3/4" Aver 3/8" 3/4" Aver — — — — — — — — — — — — — — — 155 185 210 240 265 320 390 450 500 540 540 540 540 540 — — — — — — — — — — — — — — 125 155 185 210 240 265 295 365 435 505 535 680 700 760 — — — — — — — — — — 95 130 165 205 240 265 285 305 325 345 365 400 450 495 535 — — — — — — — — — — — — — — 95 135 175 215 255 295 335 375 415 455 495 535 600 700 750 760 760 760 — — — — — — — — 60 105 155 200 245 265 295 315 335 360 385 405 430 455 475 — — — — — — — — — — — — — — 65 125 185 240 300 355 415 470 530 540 540 540 540 540 540 760 760 760 — — — — — — — — 70 90 110 140 170 205 240 270 — — — — — — — — — — — — — — — — — — — — — — 90 140 225 310 395 480 540 540 540 540 540 — — — — — — — — — — — — — — 33SE — — — — — — — — — — — — — — — — — — — — — — — — — — — — — 3/8" Bulbs (copper bulb limit - 425°C) 3/4" Aver 33A 33C 33D 33E 35 40 120 190 — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — 390 455 540 540 540 540 540 540 540 540 540 540 540 540 — — — — — — — — — 385 445 510 540 540 540 540 540 540 540 540 540 540 540 540 — — — — — — — — — — — 380 480 540 540 545 540 540 540 540 540 540 540 540 540 540 — — — — — — — — — — — 380 450 525 540 540 540 540 540 — — — — — — — — — — — — — — — — — — * All 316 SS, 3/4", Aver - 760°C All Cu. 3/4" - 425°C 8 Options & Accessories Compression fitting 3/4" bulb NPT Connection Compression fitting 3/4" bulb for Thermowell (P/N 1551-31) Compression fitting for 3/8" bulb – Tapped Exhaust (P/N 12140-3 ) Bracket to Mount Transmitter to Thermowell (P/N 859-89 ) Kit for 2" Pipe Mounting (P/N 3351-101 ) Plastic Cover for Transmitter (P/N 3351-94 ) 1) Maximum operating temperature for Copper Bulbs is 425°C. 2) Transmitter must be selected from first column (read left to right) of maximum operating temperatures which satisfy range requirements. 3) Thermal systems are not interchangeable between different lettered transmitters. 8.22 Pneumatic Transmitters Model 33 Nullmatic™ Temperature Transmitter Dimensional drawings Mounting Dimensions 8 8.23