DA-750 1 page
Contents Outline of Product 3 page Features of Product 3 page Specifications of Product 4 page Name and central function of section 5 page Illustration of Terminal 8 page Setting of Menu 9 page Description of Menu in detail 7~13 page External Dimension 13~14 page 2 page
[ Outline of Product ] DA-750 is a product to detect leakage of various toxic or combustible gases which may occur in the process of manufacturing at industrial places including a plant and gas storage, and thus to prevent an accident. By consecutively inhaling and sensing leaked gas at site using a micro pump, the gas sensing function can be smoothly carried out in an environment at which gas sensor cannot be installed or control is difficult. Also, it can output by changing a digital signal into a standard current signal of 4-20mA, and provides a signal to various external devices such as PLC, DDC and RECODER. Through these, the construction of environment of more expanded and generalized for gas monitoring will become easy. In case of gas leakage, with RS-485 communication signal it provides Relay Contact output by alarm signal. Also, DC 4-20mA standard output enables the transmission distance of output signal to connect up to maximum 2500m,and enables RS-485 communication up to 1000m of transmission. [ Features of Product ] Auto-Suction Type Using a micro pump, it inhales and detects consecutively leaked gas at site, and thus in the environment in which a gas sensor cannot be installed or control is difficult, the gas detective function can smoothly performed. Digital Process With various Artificial Intelligence Functions through the digital process based upon micro- process, more convenient, accurate and efficient gas detecting function can be carried out. LCD Display with Back-Light As the detected density is displayed on LCD, the instant confirmation of the density is possible, and the density can be confirmed in the dark surroundings. Isolation Circuit In order to effectively block electric noise, an isolation circuit is directly made inside the circuit, and thus the stability of sensor output is intensified. 3 page
Signal-Output With various output methods such as DC 4-20 ma, 2 Step-Relay Contact, and RS-485, signals are supplied to external devices. [Specifications of Product ] Classification Description Principle of detection Method of detection TCD, Ndir, Catalytic,PID(Photoionization) Suction Type Input power DC 20~24V Inhaled volume Accuracy Output signal Storage of gas leakage data Indication of density Alarm indication Setting of alarm value Alarm retarding time Alarm clearing Alarm output 1.0 Liter/min ~ 2.5 Liter/min 3%/Full Scale 4-20mA DC/F.S Storage of gas leakage record: 4,000 pieces LCD Display - PPM, %LEL, %,PPb may be arbitrarily set AL1 Alarm? AL1 LED (RED) AL2 Alarm? AL2 LED (RED) AL1/AL2 2 stages Alarm-User can optionally set. 0~99 seconds, User can optionally set Manually or automatically returning 2 stages (AL1/AL2) Alarm RELAY CONTACT Operating temperature -10 ~ 50 Operating humidity How to install Signal cable Gas inhaling Output option 5 ~ 95%RH (Non-Condensing) Wall Mounting Type CVVS & CVVSB 1.25sp*3 Wire-Shield Type 6 Tube RS-485 4 page
[Name and central function of section ] NO Description NO Description NO Description NO Description 1 Cover Case 13 Motor DOWN S/W 25 Pump 37 Alarm TB 2 Body Case 14 ENT Switch 26 Pump In 38 RS485 TB 3 LCD Display 15 JP3 27 Pump Out 4 Power LED 16 JP7 28 Sample Gas Inlet 5 Fault LED 17 JP2 29 Sample Gas Vent 6 AL1 LED 18 JP6 30 Cable Grand 7 AL2 LED 19 Flow Meter Out 31 Cover Fixed Screw 8 MODE Switch 20 FLOW METER 32 Battery Socket 9 RESET Switch 21 Flow Meter In 33 JP1 10 UP Switch 22 PHOTO TR 34 Fuse 11 DOWN Switch 23 Sensor Cap 35 Power/mA TB 12 Motor UP S/W 24 Sensor Out 36 Power Switch 5 page
1. Cover Case Sensor, Pump, and PCB board which are installed inside should be protected from external impact and environmental changes. 2. Body Case Sensor, Pump and Display board, Analog AMP board, Power board should be installed and protected from external impact and environmental changes. 3. LCD Display (128*64dot Graphic LCD) Gas density value measured at the sensor and setting parameter are displayed. 4. Power LED (Green) If power supply is normal, LED lights up. 5. Fault LED (Yellow) In case of fault circuit, erroneous setting of parameter, clogging of flow meter, the Fault LED lights up and fault signal outputs to the external contact signal. 6. AL1 LED (RED) If the density of measured gas is higher than the setting value of ALARM1, the LED blinks with 0.5 seconds interval, and the relay contact signal outputs externally. 7. AL2 LED(RED) If the density of measured gas is higher than the set value of ALARM2, the LED blinks with 0.25 seconds interval, and the relay contact signal outputs externally. 8. MODE Switch Function of entering into the setting mode at a normal condition. Press the MODE switch for longer than 3 seconds, and it enters into the setting mode. 9. RESET Switch Function of clearing external relay (In case of the kind of reset is manual at the setting menu). When in need of transfer the setting mode to the measuring mode, use the RESET Switch. 10. UP Switch This has a function of increasing the parameter value at the setting mode. 11. DOWN Switch This has a function of decreasing the parameter value at the setting mode. <11.1> UP+DOWN (TEST function) If the UP Switch and the DOWN Switch are simultaneously pressed for 3 seconds, the motion condition of the measured value, Alarm relay, Alarm LED, 4~20mA out put can be confirmed. 12. Motor UP Switch This has a function of increasing the sample gas volume. 13. Motor DOWN Switch This has a function of decreasing the sample gas volume. 6 page
14. ENT Switch This is used for storing the parameter value at the setting mode. 15. JP3 Connector This is a 40PIN Connector connecting Display PCB with AMP PCB. 16. JP7 Connector This is a 3PIN Connector connecting the out put signal cable at the Gas Sensor. 17. JP2 Connector This is a 2 PIN Connector connecting the out put electric signal cable at the Pump motor. 18,JP6 Connector This is a 20PIN Connector connecting POWER PCB with Analog PCB. 19. Flow Meter Out. Outlet direction of Flow Meter volume. 20. Flow Meter This indicates the Sample gas volume. The flowing velocity can be measured by the position of the ball. 21. Flow Meter In Inlet direction of Flow Meter volume. 22. PHOTO TR This has a function of inspecting if airflow is flowing or not. 23. Sensor Cap This is a place of inspecting gas leakage. 24. Sensor Out Outlet direction of the flow of Sensor Cap. 25. Pump A Motor generating the flow rate. 26. Pump In Inlet direction of the Pump flow rate. 27. Pump Out Outlet direction of the Pump flow rate. 28. Sample Gas Out Sample gas vent port (1/4 ) 29. Sample Gas Inlet Sample gas inlet port (1/4 ) 30. Cable Grand Power supply and signal Cable 31.Cover Fixed Screw A screw fixing the Cover case and Body. 32. Battery Socket 7 page
Power supply for storage of alarm data. 33. JP1 Connector Connector for downloading CPU Firmware. 34. FUSE Degaussing for protection of board when over-current occurs. 35. Power/4-20mA Terminal (24V, 0V, ma,e) Terminal for supplying power and connecting 4-20mA output. 36. Power Switch Power ON/OFF Switch. 37. Alarm Terminal Terminal for Fault, Alarm1, Alarm2, contacting output, 38. RS485 Terminal Terminal for data communication [ Illustration of Terminal ] Indicator DA-750 Terminal Block 8 page
[Setting of Menu] <Measuring Mode> <Setting Mode> 1.0 [MODE S/W] PUSH <LANGUAGE> KOREAN NH3 PPM ENGLISH Screen Screen [UP S/W] [RESET S/W] Dead Band Dead Time UNIT High Scale OFFSET Warming Up ALARM1 AL-TYPE1 Longview, Log Clear ALARM2 AL-TYPE2 COM CAL AL-RESET TIME Screen Scrren [DOWN S/W] Press MODE key for longer than 3 seconds at the measuring mode, and the setting mode is displayed (Screen2). Press ENT key after selecting one out of KOREAN,ENGLISH, and the next menu screen is displayed (Screen3). Whenever pressing DOWN key, the next menu is displayed. UNIT High Scale ALARM1 AL-TYPE1 ALARM2 AL-TYPE2 AL-RESET TIME Dead Band Dead Time OFFSET Warming Up Log View Log Clear COM CAL Whenever pressing UP key, the nest menu is displayed. UNIT High Scale ALARM1 AL-TYPE1 ALARM2 AL-TYPE2 AL-RESET TIME Dead Band Dead Time OFFSET Warming Up Log View Log Clear COM CAL Press ENT key, and Setting value is emerged. Press RETSET key, and Setting mode is changed to Measuring mode. 9 page
[Description of Menu in detail] N0 MENU DESCRIPTION 1 LANGUAGE Selection of language (KOREAN, ENGLISH) 2 UNIT Setting menu of Density unit of %,%LEL,PPM, 3 High Scale 20mA Setting menu comparing with Full Scale. 4 ALARM 1 Setting menu of Alarm1 value 5 AL-TYPE1 Kind of ALARM1 (H&H, L&L) 6 ALARM 2 Setting menu of Alarm2 menu 7 AL-TYPE2 Kind of ALARM2 (H&H, L&L) 8 AL-Reset Method for clearing Alarm 9 TIME Time adjustment 10 Dead Band ALARM DEAD BAND Menu. 11 Dead TIME ALARM DEAD TIME Menu 12 OFFSET Correction of error to measured value 13 Warming Up While power is supplied, time for initialization (0~99 seconds) 14 Log View Emerging menu of Alarm value 15 Log Clear Deleting menu of Log record 16 COM Setting menu of RS-485 communication. 17 CAL Correction of sensor (1) UNIT Setting of unit such as %, %LEL, PPM (2) High Scale Setting of 20mA compared with FULL SCALE. page 10
(ex) In case of setting SCALE: 100 In case of inputting 4mA analog: 0 Display In case of inputting 20mA analog: 100 Display (3) Alarm 1 Alarm output according to Kind1 setting. (ex1) ALARM-TYPE1: H&H, In case of setting Alarm value1: 20 In case that the display value is more than 20, ALARM1 operates. (ex2) ALARM-TYPE1: L&L, In case of setting Alarm value1: 20 In case that the display value is less than 20, ALARM1 operates. (4) AL-TYPE1 For inflammable or toxic gas: H&H(In case of more than the setting value, Alarm1 operates) For oxygen: L&L(In case of less than the setting value, Alarm1 operates) (5) Alarm 2 According to setting of kind 2, Alarm is output. (ex1) ALARM-TYPE2: In case of setting H&H, Alarm value 2: 20 In case that the display value is more than 20, ALARM2 operates. (ex2) ALARM-TYPE2: In case of setting L&L, Alarm value 2: 20 In case that the display value is less than 20, ALARM2 operates. (6) AL-TYPE2 For inflammable or toxic gas: H&H (In case of more than the setting value, Alarm2 operates) For oxygen: L&L(In case of less than the setting value, Alarm2 operates) (7) AL-Reset ALARM relay. AUTO HAND selectable. -AUTO: Regardless of the reset switch, LED is changed according to setting value. -HAND: Only if the reset switch is pressed, the Relay, LED are changed (8) Time Adjustment Setting Menu of year, month, day, hour, minute, second. page 11
(9) ALARM DEAD BAND As ON/OFF of the relay output continues near the Alarm setting value, this function exerts hysteresis value in order to eliminate this phenomenon. (ex1) In case of ALARM1: 20, ALARM TYPE: H&H, D-BAND:3 In case that the display value is more than 20, ALARM1 ON In case of less than 17, ALARM1 OFF. (ex2) In case of ALARM1: 20, ALARM TYPE: L&L, D-BAND:3 In case that the display value is less than 20, ALARM1 ON In case of more than 23, ALARM1 OFF. (10) Dead time (ALARM DELAY TIME) This is a menu for preventing an instant error by an effect of external impact or noise, etc. not by normal action of the sensor. (ex) In case of Alarm value: 50, DEAD TIME: 5 In case that the measured value is maintained for longer than 5 seconds with more than the Alarm setting value, it is regarded as Alarm value. (11) OFFSET (Correction of the measured value) Error to the measured value occurred at the sensed part is offset with plus and minus. (ex) In case of setting OFFSET: +5. In case that the output error at the sensed part is?5, the actual display is indicated?5, but by correcting of OFFSET as much as +5, the display is shown 0. (12) Warming up When power is supplied, time for initialization is set. (13) Log View Alarm value stored at memory is shown on the LCD screen. (14) Log Clear All information of alarm value stored at memory are deleted. (15) COM(Setting of communication) RS-485 Baud rate is set RS-485 Local number is set (16) CAL(Correction of sensor) (1.1) ZERO CALIBRATION page 12
Press ENT KEY at the state of CAL [ZERO], and an optional value of ZERO GAS READ..<0.0 %> is shown. And, by using a correction device, inject clean air or 100% nitrogen into 500ml/min flow volume for 1 minute. When the measured value became stable after injection of gas, press ENT KEY, and SUCCESS is shown. However, if the correction does not succeed, FAIL is shown for 2 seconds. <Caution> In case of the cancellation of the correction, press the RESET KEY. (1.2) SPAN CALIBRATION At the state of CAL [SPAN], press ENT KEY and an optional value of SPAN RANGE <20.9 %> is shown. Using UP,DOWN KEY, input the standard gas value. Press ENT KEY again, and an optional value of SPAN GAS READ. [20.9%] is shown. Using a correction device, inject standard gas into sensor part, and the flow volume of 500Ml/min into the detection degaussing. After injection of gas, when the measured value became stable, press ENT KEY, and SUCCESS is shown. However, if the correction was not succeeded, FAIL is shown for 2 seconds. <Caution> In case of cancellation of the correction, press the RESET KEY, [External Dimension] POWER FAULT AL1 AL2 10.0 F L O NH3 PPM W RESET MODE UP DOWM UP DOWN ENT MOTOR TEST 정면도 Front 측면도 Side page 13