EDS3-127C

THERMAL CONDUCTIVITY GAS ANALYZER DATA SHEET Thermal conductivity gas analyzer is a gas analyzer which quantitatively measures gas concentration by utilizing a causal relationship that the temperature of a heated platinum wire changes with gas concentration. The analyzer continuously measures the concentration of gases such as H2, He, and Ar with high stability. ZAF-3 FEATURES 1. 2. 3. 4. Easy-to-see large LCD is helpful for efficient operation. Measured value is output as a linearized output signal. Line voltage lies within 100 V to 240 V AC, 50/60 Hz. External dimensions are the same as those of the preceding type. 5. Zero point and span can be automatically calibrated (at option). 6. Other gases’ interference is correctable (at option). 7. Communicable with other system through an RS-232C interface (MODBUSTM)(at option). SPECIFICATIONS Standard Specifications Measuring principle: Measurement of thermal conductivity Measurable component: He, Ar, H2, CH4, CO2 Measurable range: Refer to Table 1 Output signal: 4 to 20 mA DC, 0 to 1 V DC, 0 to 10 mV DC Isolated output (Any one-output signal specifiable in CODE SYMBOLS) Allowable load resistance: 550 Ω max. (in 4 to 20 mA DC output) Output resistance: 100 kΩ (in 0 to 1 V DC or 0 to 10 mV DC output) Display unit: LCD with backlight Display of measured value: Max. 4 digits Display language: English Output signal holding: In both manual and automatic calibrations, output value just before calibration can be held. Power supply: 100 to 240 V AC, 50/60 Hz Power consumption: Approx. 50 VA Warm-up time: At least 30 min Ambient temperature: –5 to 45˚C Ambient humidity: Less than 90% RH (condensation unallowable) Storage conditions: –20 to 60˚C, less than 95% RH (condensation unallowable) Mounting: Flush mounting on panel α ∠α=90° External dimensions (H x W x D): 240 x 192 x 213 mm Mass: Approx. 5 kg Finish color: Off-white (equivalent to 10Y7.5/0.5) Housing: Steel-plate case, indoor use type Material of gas-contacting parts: JIS SUS304, platinum, platinum iridium, silver, fluororubber, epoxy resin, nickel, tin Gas inlet/outlet, purge port: Rc1/4 or NPT1/4 (whichever specified) External connection terminal: M3.5 screw terminal (9-pin D-sub connector for RS-232C) Purge gas flow rate: Approx. 1 L/min (for measurement of combustible gases) Performance Repeatability: Linearity: Drift: ± 1% of F.S. ± 2% of F.S. Zero point : within ± 2% of full scale/week (H2 meter, reference gas N2) Span : within ± 2% of full scale/week (H2 meter, reference gas N2) EDS3-127c Date Apr. 1, 2011 ZAF-3 Response time (90% response): High speed within 10 sec (at flow rate 1L/min), allowed only for H2 meter (reference gas N2, without interference compensation) Standard within 60 sec (at flow rate 0.4 L/min) Other gases’ interference: Indication error of each measured value (vol%) Interference component H2 CH4 SO2 Ar CO2 O2 1% 1% 1% 1% 1% 1% H2 meter – +0.17 –0.31 –0.15 –0.125 +0.019 – CH4 meter +5.8 – –1.8 –0.87 –0.725 +0.11 – Ar meter –6.5 –1.15 +2.1 – +0.83 –0.125 – CO2 meter –8.0 –1.38 +2.5 +1.2 – –0.15 –0.56 H2O 1.5°C saturation Standard Gas Measurement Conditions 0 to 50˚C Constant at 0.4 ± 0.05 L/min Constant at 1 ± 0.05 L/min(High responce) Dust: Less than 100 µg/Nm3 with a particle size of 0.3 µm max Pressure: 10 kPa max Mist: Unallowable Oxygen gas: No oxygen should be contained in measured combustible gases. Moisture: Below saturation at 2˚C Corrosive gas: Unallowable Standard gases for calibration: Zero gas : same as reference gas or as specified Span gas : Concentration within 90 to 100% of measuring range (Positive range) Concentration beyond 100% is inapplicable Temperature: Gas flow rate: Suction pump OFF output in automatic calibration (reray “ON” immediately after turnning on power supply) Upper limit (1 point) concentration alarm output Lower limit (1 point) concentration alarm output Upper/Lower limit (1 point) concen -tration alarm output Upper limit (1 point) and lower limit (1 point) concentration alarm output (Total 2 points) High-high limit (1 point at each step) concentration alarm output (Total 2 points) Low-low limit (1 point at each step) concentration alarm output (Total 2 points) Analyzer error or automatic calibration error alarm output Calibrating status output Range information output (only with 2-range meter) Contact input: 3 non-voltage contact inputs ON; 0 V, OFF; 5 V DC, current at ON; 5 mA Isolated with photo coupler between inputs and internal circuit. Not isolated between contact inputs. The following actions can be input Remote holding of measured value output Remote range changeover (only with 2-range meter) Remote start of automatic calibration Installation Conditions • The analyzer should not be exposed to direct sunlight or radiation from a hot object. • A place subjected to heavy vibrations should be avoided. A location with clean atmosphere should be selected. • Before measuring combustible gases, the existing gases should be purged from the analyzer using air or N2. • When the analyzer is installed outdoors, it should be sheltered with a housing or cover to protect it from rain and wind. Interference gas measured value input: Analog input for H2 m eter interference correction (1 to 5 V DC, 1 range) Either CO2 or CH4 component of an external gas analyzer is to be input. Adjustment is required at Fuji Electric’s factory. Details of measurement gas will be checked when receiving an order. Automatic calibration function: Zero and span calibrations are automatically carried out at the predetermined intervals. Calibration gases are flowed sequentially by driving the externally installed solenoid valves. Optional Specifications Relay contact output: 5 SPST relay contact outputs Relay contact capacity; 220 V AC/2 A (resistive load) Isolated with relay between contacts, and between contacts and internal circuit. Max. 5 points are selectable among those listed below. Zero-side solenoid valve drive output for automatic calibration Span-side solenoid valve drive output for automatic calibration 2 Communicating function: RS-232C (9-pin D-sub output) Half duplex, asynchronous MODBUS TM p rotocol, communication speed 9600 bps Contents of communication: Reading/writing of measured concentration values and various set values, and output of device status Remarks: For connection in RS-485, RS-232C/RS-485 converter should be provided seperately Explanation of Functions Output signal holding Remote output holding input When holding is set (user setting is turned ON), the latest measured value output just before output signal holding will be held during manual or automatic calibration, or by remote output holding input. In this status, indicated values will not be held. Upon short-circuiting the remote output holding input terminal when holding is set (user setting is turned ON), the latest measured value output will be held. Holding continues while the contact input terminal is close-circuited. In this period, indicated values will not be held. When remote range setting is selected (user setting is turned ON) for two rang type, range will be changed over according to the external signal input (non-voltage contact) applied to the remote range changeover input terminal. In this mode, range cannot be changed manually. When close-circuiting the contact input terminal, the first range is selected, and the second range is selected at open circuit. With two rang type, the current measuring range identification is output in contact signal. The contact output terminal is closed for the first range, and open for the second range. Zero and span calibrations are automatically carried out by outputting the signal for driving the externally installed solenoid valves for calibration gases at the set start time and interval or through input of the remote calibration start signal. • Calibration channel: 1 component • Calibration accuracy: ±0.2% of F.S. • Zero calibration point settable range: 0 to 100% of F.S. • Span calibration point settable range: 1 to 100% of F.S. • Calibration interval settable range: 1 to 99 hours (1 hour step) or 1 to 40 days (1 day step) • Calibration gas injection time settable range: 60 to 599 sec (in sec) • Calibration start: Internal timer or remote calibration start input • Solenoid valve drive signal output: SPST contact (zero x 1, span x 1) • Suction pump OFF output in calibration: SPST contact (suction pump OFF x 1) • Remote calibration start input: No-voltage contact input Automatic calibration is started by applying a non-voltage rectangular wave to the remote calibration start input terminal (opened after close-circuiting for 1.5 sec or longer). When contacts open, automatic calibration is carried out once. • Automatic calibration error alarm output: SPST contact Contacts close when the quantity of zero or span calibration exceeds 50% of full scale from the level of previous calibration, and contacts open when there is no abnormalities. When automatic calibration is abnormal, measurement output depends on the previous calibration values. • Automatic calibration status output: SPST contact During automatic calibration, contacts close, and open when within 50%. Remote range changeover input Range identification signal output Automatic calibration Upper/lower limit, Alarm contact output is issued with reference to the set upper/lower limit for alarm. Hysteresis is upper limit and lower settable. limit alarm output When measuring value exceed alarm setting value, contacts close, and open when not exceeded. SPST contact Analyzer error Interference correction by interference gas measured value input When the analyzer or automatic calibration is abnormal, contacts close, and open when normal. SPST contact Correction is made using either CO2 or CH4 component for H2 measurement. Measured H2 gas concentration is corrected in response to a concentration change of interference gas within its concentration range measured and set in advance. External interference gas measured value input : 1 to 5 V DC, 1range Interference gas fluctuation range : Reference concentration ± 20% F.S. H2 gas concentration correcting range : Reference concentration ± 25% F.S. Correction accuracy : ±5% F.S. (Note 1) Enter in the sample gas component check list on the back cover. (Note 2) Correction accuracy value is larger when other interference gas is contained in the sample gas. 3 ZAF-3 MEASURING PRINCIPLE Measuring chamber Sample gas Reference chamber This thermal conductivity gas analyzer measures gas concentration by utilizing the different thermal conductivities of 2 gas components. In the detector, there are reference and measuring chambers in each of which a thin platinum wire is stretched. The reference chamber is filled with reference gas and through the measuring chamber, sample gas is flowed. Each platinum wire composes a bridge circuit in combination with an external fixed resistor, and it is heated by flowing a constant current. When there is a change in the concentration of the component under measurement, the thermal conductivity of sample gas will change to affect the temperature of the platinum wire in the measuring chamber. The resulting thermal change is taken out as a change in electric resistance, according to which the concentration of measured gas is calculated. Thermal Conductivity Ratio of Gases DC constant current Gases Sulfur dioxide gas Carbon dioxide gas Argon Carbon monoxide Steam (100°C) Air Nitrogen Oxygen Methane Hydrogen SO2 CO2 Ar CO H2O N2 O2 CH4 H2 Comparative thermal conductivity (0°C) when replacing thermal conductivity of air (2.41 x 10-2 w/(m.k) with 1 DC amplifier Fixed resistor Table 1: Measurable Component and Measurable Range Measured gas H2 He Ar CH4 CO2 Reference gas component (Note 1) N2, (CO2, Ar, He) N2, (CO2, Ar) O2, Air N2, O2, Air, (He) N2, (CO2, Ar, He) N2, O2, Air, (He) Measurable range 0 to 3, 5, 10, 20, 50, 80, 100% 100 to 90, 100 to 80% 0 to 5, 10, 20, 30, 40, 50, 80, 100% 100 to 90, 100 to 80% 0 to 10, 20, 50, 80, 100% 100 to 90, 100 to 80% 0 to 20, 40, 50, 60, 80, 100% 100 to 80% 0 to 10, 20, 50, 100% 100 to 90, 80% Range ratio(Note 2) 1 : 10 1 : 10 1:5 1:5 1:5 (Note 1) Contact us for the components in the parentheses. H2 contained in O2 cannot be measured. (Note 2) Range ratio stands for maximum value. GAS SAMPLING SYSTEM DIAGRAM (EXAMPLE) Example of gas measurement in industrial furnace, sintering furnace, etc. Suction pump OFF signal in automatic calibration Gas aspirator Mist filter (Note 2) Peltier gas cooler Span calibration signal (Note 2) Drain pot Zero calibration signal Solenoid valve Pressure reducing valve (Note 1) Dust must be purged adequately (for protection of the pump, flowmeter, etc.). (Note 2) Unnecessary if sample gas is dry. (Note 3) Select the one with no pulsating flow within the specified flow rate range. Flow checker Sample gas (Note 1) Membrane filter ZAF Exhaust 0.4L/min (Note 3) or 1L/min Mist filter Purging air or nitrogen 1L/min Span gas Zero gas 4 CODE SYMBOLS ZAF 9 10 11 12 13 14 45678 3– – Digit Description 4 (Note 1) Indication in English, standard response E Indication in English, high-speed response H 5 H2 K Ar L He M CH4 E CO2 (reference gas Ar unallowable) A Other Z (Note 2) 6 N2 4 Air (incompatible with H2/CH4 measurement) 5 O2 (incompatible with H2/CH4 measurement) 6 Other Z 7 AC100 to 240V 50/60Hz, Rc1/4 0 AC100 to 240V 50/60Hz, NPT1/4 1 8 3 9 0 to 3% (H2) 0 to 5% (H2 ,He) 0 to 10% (H2, He, Ar, CO2) 0 to 20% 0 to 30% 0 to 50% 0 to 80% 0 to 100% 100 to 90% (H2, He, Ar) 100 to 80% (H2, He, Ar,CH4) Other 10 (Note 3) None 0 to 5% (H2 , He) 0 to 10% (H2, He, Ar) 0 to 20% (H2, He, Ar, CO2) 0 to 30% 0 to 50% 0 to 80% 0 to 100% Other 11 DC4 to 20 mA DC0 to 1V DC4 to 20 mA + RS-232C communication DC 0 to 1 V + RS-232C communication DC0 to 10mV 12 (Note 4) Provided 13 (Note 5) None Provided 14 None Automatic calibration Automatic calibration Concentration alarm See table below. Concentration alarm Contact output selection Contact output selection Q L M N V P T J 9 8 Z Y L M N V P T J Z A B C D E A Y A Y A B C D E F (Note 1) High-speed response is for H2 meter used for reference gas N2 only. (Note 2) Reference gas refers to gas other than the component to be measured in sample gas. ("Z" must be specified when interference gas is to be contained.) (Note 3) The ratio of maximum range to the first range is as given below. For CO2, Ar or CH4 measurement : 1st range x 5 (times) For He or H2 measurement : 1st range x 10 (times) A range from 0 to ...% cannot be combined with that from 100 to ...%. 1st range < 2nd range (Note 4) Specify Y if linearization in the 12th digit is not required. (Note 5) A CO2 or CH4 meter needs to be prepared separately. A reverse range such as 100 to 0% cannot be specified. Input signal is 1 to 5 V DC. Adjustment is required at Fuji Electric’s factory. Details of measurement gas will be checked when receiving an order. Reverse range such as 100% to 0% cannot be specified. Cannot be specified if high-speed response is selected. Input/output contact specifications 14th digit : A 14th digit : B 14th digit : C 14th digit : D 14th digit : E 14th digit : F Automatic calibration Concentration alarm Contact output selection (Note 7) Automatic Zero gas valve drive — (DO1) — (DO1) calibration Span gas valve drive — (DO2) — (DO2) — (DO3) — Suction pump OFF in automatic calibration (DO3) — — — — — — (DO4) — (DO5) (DI3) (DI2) (DI1) Any one alarm settable on screen (DO1, 2) 2 Point (NO) Contact (DO4) (DO3) (DO5) (DI3) (DI2) (DI1) Any one alarm settable on screen (DO1, 2) 2 Point (NC) Contact (DO4) — (DO5) (DI3) (DI2) (DI1) (DI3) (DI2) (DI1) (DI3) (DI2) (DI1) (Note 1) Mark : Normally Open (NO) contact (Note 2) Mark : Normally Closed (NC) contact,after turning on power supply (Note 3) Low range : Contacts close, High range : Contacts open (Note 4) When contacts open 1.5 sec after their closure, automatic calibration starts. (Note 5) Contacts closed : Low range, Contacts open : High range (Note 6) Contacts closed : Holding, Contacts open : Holding canceled (Note 7) Up to 5 contact output points can be selected. Contact input — Concentra- Upper limit (1 point) concentration alarm Lower limit (1 point) concentration alarm — tion Upper/lower limit (1 point as a set) — alarm concentration alarm Upper limit (1 point) and lower limit — (1 point) concentration alarm 2-step upper limit (1 point each) — concentration alarm 2-step lower limit (1 point each) — concentration alarm Other Calibration status (DO4) Range information (2-range meter) (Note 3) — (DO5) Analyzer error or automatic calibration error Remote automatic calibration start (Note 4) (DI3) (DI2) Remote range changeover (2-range meter) (Note 5) (DI1) Remote measured value output holding (Note 6) Contact output Any one alarm settable on screen 2 Point (NO) Contact Any one alarm settable on screen 2 Point (NC) Contact 5 ZAF-3 ZRJ OUTLINE DIAGRAM (Unit : mm) 192 Panel 1.6 < t < 10 193 169 140 t (24) GAS ANALYZER MODE ESC ENT ZERO SPAN Mounting brackets Front view (43) Side view External terminal (option) M3.5 screw Rc1/4 or NPT1/4 (whichever specified) INLET Panel cutout 184 0 +2 1 11 2 12 3 13 4 14 5 15 6 16 7 17 8 18 9 19 10 20 240 230 OUTLET 12345 PURGE 182 192 External terminal (standard) M3.5 screw Rear view CONNECTION DIAGRAM (Standard) 1L 2N 3E 4+ 5– Power supply 100 to 240V AC, 50/60Hz Grounding terminal Measured value output (as specified) 4 to 20mA DC 0 to 1V DC 0 to 10mV DC Interference correcting input 1 to 5V DC Remote output holding Remote range changeover Remote automatic calibration start AIN+ AIN– DI1 (Option) 13th digit A and 14th digit A, B, C, D, E, F 1 11 DO1 2 12 DO1 3 13 DO2 4 14 DO2 5 15 DO3 6 16 DO3 7 17 DO4 8 18 DO4 9 19 DO5 10 20 DO5 Contact output 1 Contact output 2 Contact output 3 Contact output 4 Contact output 5 130 Rc1/4 or NPT1/4 (whichever specified) OUTLET Rc1/4 or NPT1/4 (whichever specified) Purging port RS-232C/Dsub 9P (whichever specified) DI1 DI2 DI2 DI3 DI3 Refer to “Input/output contact specifications” in CODE SYMBOLS. 6 232 +2 0 INLET (35) 230 (248) (268) 240 SCOPE OF DELIVERY Analyzer main unit Panel mounting brackets (1 set) 2 power fuses (250 V AC, 1 A) Instruction Manual ITEMS TO BE PREPARED SEPARATELY Gas sampling equipment, standard gas, receiving instrument, etc. With interference corrective calculation: CH4 o r CO 2 g as analyzer ORDERING INFORMATION 1. 2. 3. 4. Analyzer type Gas component to be measured Measuring range Gas component other than measured Very important information required to achieve intended accuracy of the instrument. (Enter in “Table for checiking sample gas component”on the next page.) 7 ZAF-3 Let us check your sample gas for safe use of Fuji Electric’ gas analyzer. Make entries where you can answer. If there is any question, contact our salesperson in charge of your company. The analyzer may not provide full performance depending on other gas components contained in sample gas. Date Item Name of customer at delivery destination Description Application, purpose Gas component to be measured Sample gas Component to be measured Other component gas Other component gas Minimum concentration (%) Normal concentration (%) Maximum concentration (%) Remarks Interference gas input Your question, etc. Measuring range 0- CO2 meter or CH4 meter Customer information Company name Section Address TEL Person in charge Fuji Electric’s salesperson in charge of your company Caution on Safety *Before using this product, be sure to read its instruction manual in advance. International Sales Div Sales Group Gate City Ohsaki, East Tower, 11-2, Osaki 1-chome, Shinagawa-ku, Tokyo 141-0032, Japan http://www.fujielectric.com Phone: 81-3-5435-7280, 7281 Fax: 81-3-5435-7425 http://www.fjielectric.com/products/instruments/ Information in this catalog is subject to change without notice. Printed in Japan