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Related Manuals for OTIS OI-675
Summary of Contents for OTIS OI-675
- Page 1 Model OI-675 Electrochemical Sensor Assembly Operation Manual Revision 1.4...
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Page 3: Product Overview
Otis Instruments, Inc. distributed magnet to activate the MENU, ADD and SUB buttons. The OI-675 incorporates any “4” Series Electrochemical Sensor and the OI-352 two-wire loop (4 to 20mA output) Amplifier Card. -
Page 5: Table Of Contents
Modified Terminal Position.....................7 4-20mA Current Loop Introduction................8 Overview...............................8 Calculations............................8 Measuring Current..........................9 Warnings.........................10 Complete System Diagrams...................11 OI-675 Complete System w/ Rainguard....................11 OI-675 Complete System w/out Rainguard..................12 OI-352 Front Panel (Amplifier Card)....................13 Wiring Configurations....................14 Sensor Configuration ........................14 Power Supply Configuration ......................16 Power On............................18 Calibration ........................19... -
Page 6: Introduction
Introduction This document is an Operation Manual containing diagrams and step-by-step instruction for proper operation of the Otis Instruments, Inc. Model OI-675 Electrochemical Sensor Assembly. This document should be read before initial operation of the product. Should a question arise during the use of the product, this document will serve as a first reference for consultation. -
Page 7: Modified Terminal Position
Modified Terminal Position New OI-675 Sensor Assemblies are now assembled with the terminal block on the back side (Back Panel) of the Front Panel. Please use the following diagrams as a reference for performing maintenance on a “new” OI-675. 1. Remove the Amplifier Card from the enclosure and turn over so that the Back Panel is visible. -
Page 8: 4-20Ma Current Loop Introduction
Overview 4-20mA ("four to twenty”), is an analog electrical transmission standard used by Otis Instruments for some of its ambient gas sensors and monitors. The signal is a current loop where 4mA represents zero percent signal, and 20mA represents 100 percent signal (full scale of the sensor assembly). The relationship between the current loop and the gas value is linear. -
Page 9: Measuring Current
Calculations cont... Actual ranges may vary with our product. If unsure, confirm with the actual gas sensor assembly distributor, Otis Instruments sales representative, or call the main Otis Instruments office for more details. Measuring Current If the value measured is 0mA, then: the loop wires are broken, the sensor assembly is not powered up, the sensor assembly is malfunctioning, or the monitor is malfunctioning. -
Page 10: Warnings
To avoid invalidating the certification, complete all wiring configurations BEFORE putting the OI-675 Electrochemical Sensor Assembly in the field. Once in the field, always use the Otis Instruments, Inc. distributed magnet to ensure non-intrusive calibration. Strong magnetic fields may interfere with the non-intrusive magnetic switches. A strong ... -
Page 11: Complete System Diagrams
Complete System Diagrams The following diagrams should be consulted for identification of the system and all parts that may be referred to in this Operation Manual. OI-675 Complete System w/ Rainguard... -
Page 12: Oi-675 Complete System W/Out Rainguard
OI-675 Complete System w/out Rainguard... -
Page 13: Oi-352 Front Panel (Amplifier Card)
OI-352 Front Panel (Amplifier Card) -
Page 14: Wiring Configurations
Wiring Configurations To ensure full-functionality, complete ALL of the following Wiring Configurations before installing the device in the field. Sensor Configuration 1. Unscrew, remove and set aside the explosion proof Moore lid. NOTE: Do not touch any metal object to the Amplifier Card. - Page 15 Sensor Configuration cont... 2. Verify that the Controller's sensor is properly connected to the terminal on the Amplifier Card by ensuring that the sensor wires are configured as follows: Signal wire to 4-20mA (signal) Positive Power Supply wire to V++ (positive) ...
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Page 16: Power Supply Configuration
Power Supply Configuration 1. After the Sensor Configuration has been completed (see above), supply 12-24 Volts DC power to the Amplifier Card (from the Controller or Power Supply). 2. Once 12-24 Volts DC is powered to the Amplifier Card, use a Digital Volt Meter (DVM) to verify the voltage according to the following instructions: Set the DVM to measure DC Volts. - Page 17 Power Supply Configuration cont... 3. Once the voltage is verified, proceed to the Power On section of this Operation Manual. NOTE: If the DVM reading is not between 12 and 24 Volts, check the connection and the DVM setting. If a problem persists, check the controller voltage output, sensor wire gauge, and wire length.
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Page 18: Power On
Power On 1. After proper power has been applied to the Amplifier Card and the voltage has been verified (see above), the display screen on the Front Panel will show the software revision number (r 1.3). 2. The device will then count up from 0 to 20. 3. -
Page 19: Calibration
20mA signal output in which the 4mA signal equals “0” and the 20mA signal equals “full-scale”. The Model OI-675 is also equipped with a dual set of switches for MENU, ADD and SUB. The manual and magnet switches are located on the Front Panel. Manual switching may be used in calibration when the explosion proof enclosure lid is removed. -
Page 20: Change/Check Null
Change/Check Null 1. Touch an Otis Instruments, Inc. distributed magnet to the top side of the device to activate the MENU button. 2. The display screen will show two dots and then “nuL”. NOTE: A message will be sent to the receiving controller indicating that the sensor is in... -
Page 21: Setting Calibration
5. Once the Null is set, proceed to the next step. Setting Calibration 1. After the Null has been set (see above), touch an Otis Instruments, Inc. distributed magnet to the top side of the device to activate the MENU button. - Page 22 2. The display screen will flash “CAL”. 3. Unscrew and remove the sensor rainguard from the sensor housing. 4. Replace the sensor rainguard with an Otis OI-410 Calibration Cup. 5. Apply a known calibration gas to the OI-410 Calibration Cup that is attached to the sensor housing.
- Page 23 Setting Calibration cont... 9. The device is now calibrated. 10. Unscrew the OI-410 Calibration Cup. 11. Reattach (screw on) the sensor rainguard to the sensor housing. 12. Touch the magnet to MENU to exit Calibration Mode. NOTE: Calibration is now complete and the Relay/Alarms are active.
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Page 24: Sensor Replacement
Sensor Replacement The device contains an Electrochemical “4” Series sensor that detects gas in parts per million. Given that the sensor must to be fully functional in order to alert technicians of the presence of toxic gas, sensor replacement may be necessary throughout the duration of the device's use to ensure optimal performance and reliability. - Page 25 Sensor Replacement cont... 4. Unscrew the rainguard and sensor housing cap from the sensor housing. 5. Using the thumb and forefinger, pull firmly and evenly to slide the sensor out of the sensor housing. NOTE: Do not use any metal object to remove the sensor.
- Page 26 Sensor Replacement cont... 6. Slide the new sensor into device, matching the sensor prongs to the corresponding eyelets inside. 7. Press the sensor into place. 8. Screw the rainguard and sensor cap housing back onto the sensor housing. 9. Plug the sensor data cable back into the sensor cable terminal on the Amplifier Card by: Matching up the notch in the terminal with the lock on the cable end ...
- Page 27 Sensor Replacement cont... 10. Verify that the sealing ring on the Moore base is still in place. 11. Place the Moore enclosure lid on top of the Moore enclosure base. 12. Rotate the lid until it is tightly screwed in place (approximately 20 rotations). NOTE: Once the sensor has been changed the Null must be set back to 0 (see page 18) and then the device must be re-calibrated (see page 19).
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Page 29: Specifications
Specifications Power Input: 12-24 VDC Power Output: 4-20 mA Sensor: Electrochemical “4” Series Certification: CSA Certified Class I, Div. 1 Groups A, B, C & D Ambient Temperature Range: -20 to 50° C -4 to 122° F Operating Current: 12mA Accuracy: +/- 5% full-scale Warranty:... - Page 31 Warranty Statement for OI-675 Electrochemical Sensor Assembly Hardware Otis Instruments, Inc. (Manufacturer) warrants its products to be free of defects in workmanship and materials—under normal use and service—from the date of purchase from the manufacturer or from the product's authorized reseller. The hardware for this device is under a one-year limited warranty.
- Page 32 Otis Instruments, Inc. Corporate Office 2200 E. Villa Maria Dr. Bryan, TX 77802 979.776.7700 www.otisinstruments.com...
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