Zirconia Oxygen Analyzer

Transcription

1 Data Sheet SS/ZDT/GP_6. Zirconia Oxygen Analyzer High Temperature Version ZDT GP Series Cost-effective solution for high temperature applications NEMA 4X/IP66 protection reliable operation in demanding environments User programmable for maximum flexibililty Comprehensive diagnostics facility with in-built software protection ensures security and confidence in operation Linear or logarithmic ranges enables programming to suit a wide variety of applications English, French, German and Spanish software simple, user-selection of display language A high temperature oxygen analyzer offering advanced functionality, simple operation and reliability in harsh environments

2 SS/ZDT/GP_6. Introduction The ZDT Analyzer/Alarm Unit is a versatile microprocressorbased oxygen analyzer designed primarily to meet the requirements of the medium-sized boiler and furnace market, utilizing high-quality zirconia oxygen probes, for energy management. The high temperature version of the ZDT Unit is designed to operate with the Model ZGP oxygen probe. The probe sensor is temperature compensated from 600 to 400 C ( to 55 F). In the event of probe thermocouple failure the temperature of the process can be preset in the ZDT Unit. The standard analyzer has high/low alarm relays and a single linear or logarithmic isolated retransmission. Display features include %O, cell temperature, cell mv, alarm set points, calibration sequence diagnostics and output settings. The analyzer provides oxygen readout with computation based on the probe mv signal. The mv output signal is Nernstian in form and follows the equation: E(mV) P 0 P = T (log0 ) C (mv) Construction and Operation The ZDT Zirconia Analyzer is housed in a sheet steel enclosure, environmentally protected to NEMA 4X (IP66) and meets the requirements of Generic Emission Standard (EN5008-) for residential, commercial and light industry and the Generic Immunity Standard (EN5008-) for industrial environments. The analyzer is based on the proven 4600 Series transmitter having a two-line display with four tactile membrane switches. The measured value display-line is a 5-digit, 7-segment green back-lit LCD while the information display-line is a 6-character, single-line, dot-matrix, green back-lit LCD. The information display can be user-programmed for display in English, French, German or Spanish language. The switch enables movement from the 'Operating Page' to the oxygen calibration sequence. Use of the appropriate security code allows further access to the pages for 'Set Up Outputs' and 'Electrical Calibration'. The switch is used to select the various programming pages while the and switches change programmable values. In the Oxygen Calibration Page a User Code is required to proceed beyond the diagnostic information to the calibration sections. Where: T = Absolute temperature ( K) P 0 = Partial pressure reference O (air) P = Partial pressure sample O C = Cell constant = Faraday s Gas Constant Reference air for the ZGP probecan be supplied by an optional integral pump within the ZDT, or by external regulated instrument air. Flow rate of the integral pump is approximately l/min. (0.64 galls/min.).

3 SS/ZDT/GP_6. Specification Analyzer Display Measured value 5-digit x 7-segment back-lit LCD Information 6-character, single line, dot matrix, back-lit LCD Parameters %O (0 to 5%) Cell temperature Cell mv Two O alarm set points alarm can be configured as a common failure alarm for any of the following: THC open circuit Cell under temperature Calibration failed Power failure Accuracies Oxygen concentration (display and retransmission) % of reading or 0.% O whichever is greater Display resolution digit System accuracy * Display % of reading or 0. O whichever is greater Retransmission % of reading or 0.% O whichever is greater Error due to power supply variation Less than 0.% for +6% 0% variation from nominal supply voltage * ZDT unit with a Z-GP probe when calibrated against a certified test gas Environmental Data Operating temperature limits 5 to 55 C (3 to 3 F) all functions 0 to 70 C ( 4 to 58 F) retransmission Storage temperature limits 5 to 55 C ( 3 to 3 F) Operating humidity limits Upto 95% RH non-condensing Power Supply Voltage requirements 00 to 30V, 00 to 60V 50/60Hz Power consumption 0VA Insulation Mains to earth (line to ground) kv RMS Outputs and Set Points No. of relays Two Relay contacts Single pole changeover Rating 50V AC 50V DC max. 3A AC 3A DC max. Loading (non-inductive) 750VA 30W max. (inductive) 75VA 3W max. Insulation kv RMS contacts to earth (ground). No. of set points Two Set point adjustment Programmable. Set point hysteresis % of set point (fixed) Local set point annunciation Red LED Retransmission One fully isolated retransmission Programmable for any range within 0 to 5% O (linear) (5% minimum span) 0.0 to 5% O (logarithmic) (Programmable for any two decades within 0.0 to 5%) Output current 0 to 0mA, 0 to 0mA or 4 to 0mA programmable Resolution 0.% at 0mA, 0.05% at 0mA Max. load resistance 750 (0mA max.) Output loop test Output loop test at 0%, 5%, 50%, 75% and 00% of output span Mechanical Data Mounting Wall-mount Protection NEMA 4X (IP66 ) Dimensions 5mm (9.9 in.) wide x 453mm (7.8 in.) high x 50mm (5.9 in. ) deep. Weight 9kg (9.8 lb) approx. 3

4 SS/ZDT/GP_6. Electrical Connections E + N L N/C C N/O N/C C N/O + H H E + SCR Mains Supply 00 to 30V or 00 to 60V, 50/60Hz Relay Relay Retransmission BROWN BLUE Heater Drive RED BLUE BRAID Cell WHITE BLUE Thermocouple Type of Thermocouple Ni-Cr/Ni-Al Pt/Pt-Rh Compensating Cable BS4937 Part No. 30 DIN C ase + Case ( T ype K) Green White Green Red Green Green ( T ypes R and S) Orange White Orange Red White White Overall Dimensions Analyzer Dimensions in mm (in.) 4 x 9.5 OD ( 3 /8) holes for M8 fixing Fixing Centers 7 (8.9) 50 (5.9) 0. % Oxygen Fixing Centers 434 (7.) 403 (5.9) 453 (7.8) 5 (9.9) 5 (0.) 33 (5.) 4

5 SS/ZDT/GP_6. Ordering Information Analyzer Z irconia Oxygen Analyzer ZDT/ X X X Probe Type ZGP Thermocouple Type None Type K Type R Type S Reference Air Supply None External Output Mains Voltage 30V 50/60Hz 0V 50/60Hz

6 SS/ZDT/GP_6. ZGP High Temperature Zirconia Oxygen Probe Introduction The ZGP Oxygen Probe has a high temperature oxygen concentration cell using zirconium oxide as a solid electrolyte. It is a second generation product developed as a result of extensive experience in zirconia oxygen sensing systems. The Probe is designed to measure excess O concentration in furnace atmospheres and is installed directly in the furnace. It provides a true wet measurement of the atmospheric conditions in situ at the plant operating temperature. This permits continuous and accurate measurement over a wide range of temperatures without the frequent maintenance and cleaning associated with external sampling systems. It eliminates the 'equilibrium shift' common to other systems in which gas samples have to be cooled before measurements can be taken and has an extremely rapid response to changes in atmosphere, enabling fast, corrective action to be taken (particularly important in automatic control situations). The probe can be mounted vertically or horizontally, although for high temperature operation the vertical position is preferred. The outer protection sheath may be supplied in aluminous porcelain, recrystallized alumina or Incoloy 800. A thermocouple is mounted within the probe to enable temperature monitoring or automatic temperature compensation. A gas calibration port is provided to allow the probe output to be checked using test gas mixtures without removing the probe from the process. Reference-air is required for accurate operation. Principle of Operation The probe comprises a ceramic detector cell housed in a protective sheath. A thermocouple is fitted within the probe to enable the process temperature to be monitored and to provide automatic temperature compensation. A connector head (protected to IP56) facilitates connection of the cell output, thermocouple and reference air connections. The sheath material may be: Ceramic (aluminous porcelain) for oxidizing atmospheres at temperatures up to 50 C (8 F) where limited amounts of corrosive chemicals are present Recrystallized alumina (special order) for reducing/oxidizing atmospheres at temperatures up to 400 C (55 F) and where corrosive chemicals are present Metal (Incoloy 800) for reducing/oxidizing atmospheres at temperatures up to 850 C (56 F) when horizontally mounted and up to 000 C (83 F) when vertically mounted A calibration gas inlet port is provided to enable the probe to be checked using test gas mixtures without removing it from the process. Reference air [500 to 000ml/min ( to ft 3 /hr)] is required for accurate operation and can be supplied from an ABB mainspowered pump unit or a flow-regulator unit. Specification ZGP Probe Temperature range 600 to 50 C ( to 8 F) continuous 400 C (55 F) max. Measuring range Refer to 'Operating Limits' diagram (opposite). The lower limit of operation, determined by the onset of electronic conduction in the solid electrolyte is dependent on temperature. The following limits are given as a guide for % electronic conduction but in practice it may be possible to measure at even lower oxygen potential levels without introducing significant errors. Temperature Concentration Minimum O Output C F Kcals bars Minimum O Potential psi Response rate < 4s to 63% of final value, < 47s to 90% of final value Reference air Clean oil free air Flow rate 500 to 000ml/minute ( to ft 3 /hr) Construction Solid electrolyte stabilized zirconia oxide Protective sheath aluminous porcelain Incoloy 800 recrystallized alumina Mounting Vertical or horizontal 4mm (.65in) minimum hole diameter as drawing opposite Connecting cable -core copper, overall screened for probe output. -core compensating cable to suit thermocouple fitted (NiCr/NiAl or Pt/Pt 3% Rh) Thermocouple Pt/Pt 3% Rh Pt BS4937 type R [600 to 50 C ( to 8 F)] NiCr/NiAl Pt4 BS4937 type K [600 to 900 C ( to 65 F)] Other types of THC can be supplied on request Insertion length 556mm or 953mm ( in or 37.5 in) see Ordering Information ZGP Probe for options Weight.5kg nett (600mm probe) [5.5lb ( in. probe)].8kg nett (000mm probe) [6.lb (37.5 in. probe)] mv

7 SS/ZDT/GP_6. Probe Output mv 500 Electronic Conduction Errors Kilocalories Non-Carburizing Atmospheres only High Resistance Normal Operation Pt/Pt 3% Rh Thermocouple Probe Life Reduced 50 NiCr/NiAl Thermocouple C F Operating Limits Overall Dimensions ZGP Probe Dimensions in mm (in.) Termination Head Mounting Flange Probe Outer Sheath 5 (4.35) ReferenceAir Line Entry 5 (4.9) 88 (3.46) off 6 (0.63) Cable Entries (4.80) 5 (0.9) 556 or 953 ( or 37.5) 7.5 (.08) Dia. Fixing holes in mounting flange to be drilled by customer. Overall Dimensions for ZGP Probe Ordering Information ZGP Probe Z GP Zirconia Oxygen Probe ZGP/ X X X X X Insertion Length 600mm (4 in.) 000mm (39 in.) 50mm (49 in.) Thermocouple P/Pr3% TC BS4937 Type R CA BS4937 Type K Special Sheath Aluminous porcelain (standard) Incoloy 800 Recrystallized alumina Special Mounting Flange in. NPT Special Connector Head Twin Gland Type C95 Head (M6 cable entry)

8 SS/ZDT/GP_6. ABB has Sales & Customer Support expertise in over 00 countries worldwide The Company s policy is one of continuous product improvement and the right is reserved to modify the information contained herein without notice. Printed in UK (0.04) ABB 004 SS/ZDT/GP Issue 6. ABB Limited Oldends Lane, Stonehouse Gloucestershire GL0 3TA UK Tel: +44 (0) Fax: +44 (0) ABB Inc. Analytical Instruments 976 S. Virginia St., Ste. E Reno, Nevada 895 USA Tel: Fax: