General Specifications

Transcription

1 General Specifications 2-wire Transmitter for inductive Conductivity Model ISC22G The EXA ISC22G transmitter is a user programmable instrument for conductivity measurements in medium to highly conductive process liquids, using inductive measuring principles. It is used in combination with the Yokogawa model ISC4 inductive conductivity sensor, for concentration monitoring applications in the chemical industry and for various other conductivity applications in the food and pharmaceutical industry, the plating and metal finishing industry and pulp & paper industry. The robust chromated cast aluminium housing, coated with a Epoxy-polyester, makes it the ideal 2-wire transmitter for mounting directly on-site, even under tough environmental conditions. Its 2-wire concept gives low installation costs, a safe operation and easy maintenance in the field. The ISC22 features user-selectable process dedicated temperature compensation for various (strong) acids and alkalis. The process linearised output function and the % -concentration displays contribute to a highly functional inductive conductivity based concentration analyser. FEATURES Process optimised temperature compensation to fit the instrument in any application. Extremely wide measuring range (> 6 decades) while maintaining a high resolution and accuracy using only one sensor type : Minimum Conductivity 1. µs/cm Maximum Conductivity 2. S/cm. Free programmable setting of the output range, including a 21-step table output to linearise the output function e.g. to % by weight. Programmable % by weight display indication. Proven simple 3-level operation system using YES/NO prompts where each level can seperately be protected from unwanted access by a 3-digit passcode. Passive 2-wire system, 4 to 2 ma for easy installation at low costs and safe operation at 24 Volt DC. HART communications interface (DD available) Event logbook in software SYSTEM CONFIGURATION Sensors Cables Fittings Transmitters Accessories 1st Edition

2 2 PROCESS DEDICATED TEMPERATURE COMPENSATION The ISC22G features optimisation of the temperature compensation for virtually any process. From neutral salt solutions to the most concentrated acids and alkalis. From tight controlled and/or very stable processes to processes that have extreme variations in both conductivity and temperature. The ISC22 s temperature compensation can easily be adapted to meet the accuracy requirements for temperature compensation imposed by the process control targets. Temperature compensation based on the IEC table for NaCl solution can be selected for standard conductivity measurements in different processes. For measurements requiring accuracy such as concentration applications, the temperature compensation can be tailored to the process. This is done during commissioning of the transmitter by using the actual process solution by programming a (linear) temperature coefficient : α (see figure 1). For processes where the temperature coefficient varies with temperature and concentration (eg Sodiumhydroxide and Sulphuric acid), matrix compensation is applied. To further simplify transmitter set up, the matrices for several common process solutions are stored in memory. Any of these can be selected from the Service Menu of the transmitter. These include: Sulphuric Acid H 2 SO %, - 1 C Sulphuric Acid H 2 SO %, - 1 C Hydrochloric Acid HCl.5-5. %, - 6 C Hydrochloric Acid HCl %, - 6 C Nitric Acid HNO %, - 8 C Nitric Acid HNO %, - 8 C Sodium Hydroxide NaOH.5-5. %, - 1 C Sodium Hydroxide NaOH %, - 1 C PC VIEWER As in everyday life, good communication is vital in the instrument world. The Yokogawa PC viewer from has been developed for communication between EXA 22 and 42 series of analyzers and a personal computer. With the PC viewer the user can read process specific parameters, process temperature, compensation factors, calibration and diagnostic information at a glance. The ISC22G is equipped with HART communication capability superimposed on the output signal. Through this HART interface and PC22 software, users can read data from the instrument and re-configure the instrument remotely from a personal computer, or hand held communicator. On the computer screen it is easy to check the configurations and to change them if necessary. Setpoints may be changed, at will, as may the control parameters for the PI control outputs. If needed, the more fundamental settings can also be changed. Current output ranges, temperature compensation coefficient and the like can easily be set up. Password protection is available to ensure that access is only available to authorised persons. PC Viewer makes it is easy for an engineer to connect to the unit and monitor the status from the comfort of his own office. He may also diagnose problems that may occur with the measuring loop. The PC viewer can be used to read the logbook information stored in the EXA analysers. This historical log of calibration data alarm and error messages provides an invaluable tool for diagnosing system and process conditions. If your process is not covered by one of these selectable curves, the user can create curves specific to the process. This is done by building a simple matrix table of temperature related conductivity values. Thus the accuracy of the measurement is fine-tuned to the specific process conditions. The matrix compensation method guaranties optimal accuracy where TC dependence from conductivity and process temperature is taken into account 3 Conductivity (ms/cm) 2 1 Kref KT Main Display of ISC22 by PC Viewer Software package Tref Temperature T α = Kref -KT T-Tref 1 x Kref Definition of temperature compensation factor (α)

3 3 OUTPUT SIGNAL The standard ISC22G features a 4-2 ma current output available for recording, indication or control functions which represent: the measured conductivity value In addition the following output functions are available: a HOLD function that holds the last measured process value or a fixed value during maintenance or commissioning a BURN function that gives a high, low or pulsed output at fail status a programmable output function that allows the user to linearize the output when used as a concentration analyzer. FAULT DIAGNOSIS - BURNOUT FUCTION The measurement is continuously checked for faults, giving warning of abnormal conductivity readings and cable problems. These faults are signaled by the FAIL flag and can be transmitted to the control room by a current of 22 ma, or 3.9 ma (burn). The fault is also signaled by a special marker field in the display, and an error code in the message display. COMMUNICATION AND LOGBOOK In combination with 2-way communication, the ISC22 and PC22 offer a Logbook feature. This is a software record of events, calibrations and alarms. A total of approximately 1 events can be stored in the Logbook. Important diagnostic information can also be read on the LCD or the personal computer display via PCViewer. CONDUCTIVITY (S/cm) Output in % 1, CONCENTRATION (% by weight) Conductivity Output CELL CONSTANT Since the ISC22 in combination with a ISC4 inductive conductivity sensor measures the conductivity of the "liquid winding" through the doughnut, part of this "measuring cell" is outside the doughnut. If there is little space between doughnut and process piping, in situ calibration with a sample of the process fluid is necessary to ensure accurate measurement. The relationship of the Cell Constant (CC) and the distance between the doughnut is shown in the picture beneath. Linearization of output Example: -25% Sulfuric acid Code ma Conc. Example Cond. Example Output 4-2 % H 2 SO 4 ms/cm Correction factor (x nominal C.C.) , non conductive piping conductive piping D D in millimeters NOTE: The corrected Cell Constant can be obtained by multiplying the Nominal Cell Constant on the label of the sensor with the installation facto found in this figure. Table where Conductivity is converted to concentration Example: -25% Sulfuric acid

4 MEASURE CAL HOLD OUTPUT SET HOLD TEMP SERVICE 4 THREE LEVEL OPERATION DIMENSIONS The EXA SC22G(S) converter uses a 3-level operating system to take full advantage of the microprocessor while retaining the traditional simplicity of analog converters. Advanced functions are separated from conventional operation to avoid confusion. They can be activated as required for each individual application. 1. The normal maintenance functions are accessible through the flexible window by pushing the keys underneath. 2. Functions required to commission the instrument are hidden to discourage unauthorized tampering. The front cover is removed to reveal the commissioning menu and the hidden access key (marked* ). 3. Specialized functions can be adjusted via the SERVICE menu. In this case access is by using service codes. Three level operation 162 (6.4) 18 (7) 92 (3.6) 3 (1.2) 115 (4.5) 1/2" SUPPLY MAINTENANCE 1/2" INPUT HOLD FAIL MODE MEASURE CAL TEMP HOLD 56±.2 (2.2) M6 bolts (2x) YES NO ENT DISPLAY COMMISSIONING MODE * OUTPUT SET HOLD TEMP SERVICE SERVICE * min. 23 (min. 8.) 154 (6.6) 3 (1.18) min.229 (min.9.) 172 (6.77) 3 (1.18) MAINTENANCE level Use : Normal operation and checking How : Simple operation by dialog through the closed front cover Example : Read secondary data displays COMMISSIONING level Use : For normal commissioning How : Removal of the front cover reveals the access key and second menu Example : Output range setting CUT-OUT DIMENSION Panel cut-out and spacing 2x ø4 (.16) SPACING PANEL CUT-OUT DIMENSIONS SERVICE level Use How Example : Only for specialized functions : Through special service code entries : Selecting process compensation With this 3-level user-friendly approach, the instrument can be operated by anyone. Commissioning is straight-forward and needs no calibration equipment compared to analog instruments. Special functions available via access codes are invisible during normal operation. All three levels can be separately protected against unauthorized access by a password system using a three digit code.

5 HOLD YES FAIL NO ENT MODE MODE MEASURE CAL DISPLAY HOLD 5 SYSTEM CONNECTION COMPUTER HAND HELD COMMUNICATOR OUTPUT SUPPLY INPUT 2,5 or 1 m Supply CURRENT OUTPUT ma-output DISTRIBUTOR Safety Barrier ISC22S only SENSORS RECORDER MOUNTING Unit: mm (inch) 56 (2.2) wall mounting pipe mounting (vertical) pipe mounting (horizontal) 2x Ø 6.5 (.26) 2 (7.87) 4x Ø 1 (.4) 7 (2.75) Universal pipe/wall mounting kit 115 (4.5) 92 (3.6) 2 ND. pipe Option /U: Universal pipe/wall mounting kit

6 6 2. GENERAL SPECIFICATIONS 2-1. Specifications A. Input specifications: Compatible with the Yokogawa inductive conductivity ISC4 series with integrated temperature sensor: NTC3k or Pt1. B. Input range - Conductivity: to 1999 ms/cm at 25 C (77 F) reference temperature. minimum: 1 µs/cm (at process temperature) maximum: 2 S/cm (at process temperature) - Temperature: -2 to +14 ºC ( to 28 ºF). - Cable length: max. 6 meters (2 feet) 1 meters (35 feet) fixed sensor cable + 5 meters (165 feet) WF1 extension cable. Influence of cable can be adjusted by doing an AIR CAL with the cable connected to a dry cell. Functional specifications Accuracy (under reference conditions): - Conductivity.5 % ± 1. µs/cm - Temperature.3ºC (.6ºF) - Temp.compensation 1 % for NaCl, 3 % for Matrix - ma-output circuits.2 ma. Influence of: - Ambient temperature ±.1% ±.5 µs/cm/ºc - Step response 8 seconds for 9 % (for a 2 decade step). C) Indicating range: - Main display to 1999 ms/cm (1 st compensation) - Message display to 1999 ms/cm (2 nd compensation), Temperature -2 to 14 ºC ( to 28 ºF) Concentration to 1.% Temperature compensation methods NaCl, T.C., Matrix ma- Output (3.9 to 22. ma Cell constant [cm -1 ] Reference Temperature (ºC/ºF) Software Release. D) Transmission signal: - General One milliampere output 4-2 ma DC, isolated from input, with a maximum load of 425 Ω (@ 24 VDC), see figure Supply voltage/load diagram. This output can be configured for Conductivity, linear or conform a user programmable table. - Status Output signalling of failure can be selected to give 22 ma ±.5 ma (continuous or single pulse of 3 sec. at start of fault) or 3.9 ma ±.5 ma (continuous). - Hold Outputs may be set to hold the last or a fixed value during maintenance. E) Transmission range: - Conductivity Minimum span 1 µs/cm and 1% of high value (2mA) Maximum span 1999 ms/cm. F) Serial Communication: Bi-directional HART digital communication superimposed on the 4-2 ma signal. G) DD specification The ISC22G(S) Device Description (DD) is available enabling communications with the hand held communicator and compatible devices. For more information contact your local Yokogawa sales offices. Supply Voltage / Load diagram Terminal voltage (V) Load Resistance (Ω) Volts 14.5 Volts 4 ma 22 ma 31.5 V (limit for IS version) Voltage (V) Minimum terminal Voltage at the ISC Communication Range 4 ma 7 ma 2 ma Output Current (ma) G) Temperature compensation: - Sensor types: 3kΩ NTC or Pt1. - Automatic: between -2 to 14 ºC ( to 28 ºF) - Algorithm: NaCl according to IEC tables. Two T.C. settings possible between. to 3.5%/ºC Matrix: user selectable/configurable. 8 selectable for concentrated solutions, 1 free programmable. Reference temperature adjustable between -2 to 14ºC ( to 28ºF). H) Sensor diagnostics: Abnormal temperature (open, short), abnormal conductivity values (E5/E6 free programmable), e.g. dry cell, wiring problems. I) Calibration: Manual, calibration Input pre-measured data (cell constant). J) Logbook: Software record of important events and diagnostic data.

7 7 CONSTRUCTION K) Display: Custom liquid crystal display. - Main display: 3 1 / 2 digits, 12.5 mm high, zero change included. - Message display: 6 alphanumeric characters, 7 mm high. - Special fields: Flags for status indication : FAIL and HOLD. - Measuring units: µs/cm or ms/cm - Key prompts: YES, NO, >, ^, ENT, Menu pointer - Keys: 6 keys operated through flexible window with tactile feedback. One hidden key behind the front cover. L) Power supply: 24 VDC nominal G-version 17-4 VDC S version VDC - Input Isolation: Maximum 1 VDC M) Housing: Cast aluminum case and cover both provided with chemically resistant coating (color: case off-white; cover moss-green). Cover with flexible polycarbonate window. Weather protection: Rain and dust tight to IP65 (NEMA 4X). Two polyamide glands 1/2. Cable terminals for up to 2.5 mm 2. N) Mounting: Pipe, Wall or Panel. O) Shipping details: Package 29 x 225 x 17 mm (w x h x d). Weight ± 2.5kg. P) Environment and operational conditions: - Ambient temp.: -1 to +55 ºC (+1 to +13 ºF) LCD operational temperature is specified -1 to +7 ºC (14 to 16 ºF) Excursions to -3 to +7 ºC will not damage the instrument. - Storage temp.: -3 to +7 ºC (-2 to +16 ºF). - Relative humidity: 1 to 9% Rh at 4 ºC ambient temperature, non condensing - Data protection: EEPROM for configuration and logbook. Battery supported clock. - Watchdog timer : Checks microprocessor. - Automatic safeguard: Return to measurement after 1 minutes when no keystroke. Operation protection: 3 digital pass codes (programmable). Power down: No effect, reset to measurement. Q) HART specifications: Minimum cable diameter:.51 mm, 24 AWG. Maximum cable length: 15 m Refer to standard HART specifications for more details. See Q) PCViewer: Latest version dowwloadable from the website. MODEL AND SUFFIX CODES Model Code Suffix Code Option Description ISC22G Inductive Conductivity Transmitter, General Purpose version Type -A Milli-amp (+HART) version -E Always E Options /H Hood for Sun Protection /U Pipe & Wall mounting hardware /SCT Stainless steel tagplate /Q Calibration certificate

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