ENMET Corporation PO Box 979 Ann Arbor, MI 48106-0979 www.enmet.
Table of Contents 1.0 INTRODUCTION ....................................................................................................................................................... 1 1.1 Unpack ...............................................................................................................................................................................1 1.2 Check Order .......................................................................................................................
EX-5155-MOS ENMET Corporation 1.0 Introduction The ENMET EX-5155-MOS sensor/transmitters (S/T) is a 3-wire, 24 VDC 4-20mA S/T for the detection of toxic gas, utilizing a Metal Oxide Semiconductor (MOS) sensor. The EX-5155-MOS is meant to be used in conjunction with an appropriate power supply and controller. The ENMET EX-5155-MOS sensor/transmitter has been designed and approved to be used in a Class I, Div. 1, Groups B, C, D, classified areas. The approval was issued by CSA International.
EX-5155-MOS ENMET Corporation 2.
EX-5155-MOS ENMET Corporation 3.0 Installation of the EX-5155-MOS CAUTION: Area must be declassified during installation. The ENMET EX-5155-MOS gas sensor/transmitter (S/T) is a 3-wire, 24 VDC, 4-20 mA S/T for the detection of toxic gas. The S/T is meant to be used in conjunction with an appropriate power supply and controller. The ENMET EX-5155-MOS sensor/transmitter has been designed and approved to be used in a Class I, Div. 1, Groups B, C, D, classified areas.
EX-5155-MOS ENMET Corporation 3.2 Wiring the EX-5155-MOS to a Control Unit CAUTION: Area must be declassified during installation. Run conduit and 16 AWG (1.5MM2) wires to the enclosure from the power supply and controller. If the EX-5155-MOS is installed in a hazardous location as defined by the National Electrical Code, then ALL wiring must be in accordance with the National code and any local governing codes.
EX-5155-MOS ENMET Corporation Display Overlay Screws (2 places) Display Overlay Display Magnetic Switches (2 places) Display Overlay Standoffs (2 places) Printed Circuit Board (PCB) J4 and J8 Terminals are located on the bottom side of PCB Sensor/Transmitter Enclosure Cutaway View Display Overlay Magnetic Switches (2 places) Printed Circuit Board (PCB) Figure 3: Terminal Positions EX-5155-MOS Sensor/Transmitter When wiring is complete, reassemble the EX-5155-MOS.
EX-5155-MOS ENMET Corporation 4.0 Operation of the EX-5155-MOS It is best to have the EX-5155-MOS transmitters powered up and operational for 24 hours before applying calibration or test gas to them. When the EX-5155-MOS transmitter is first powered up, it goes through a series of momentary screens, which identify the instrument model number, serial number and software revision.
EX-5155-MOS ENMET Corporation Purge times vary form 5 – 25 minutes depending on the sensor installed. Some sensors require additional purge time after start up. Particularly if the sensor is new or the system powered down for an extended period of time. To initiate a purge: Turn the power off and back on. This will initialize a purge cycle. See Figure 5 for the Operational portion of the Maintenance Menu Flow Chart. 4.
EX-5155-MOS 5.0 Maintenance of the EX-5155-MOS CAUTION: Do ENMET Corporation not open the EX-5155-MOS S/T in a classified area. CAUTION: Do Not Attempt A Span Procedure Without Calibration Gas Applied to The Sensor; if this is done, the S/T is forced into a calibration fault mode. Magnetic switches control the MENU and SELECT functions. The MENU and SELECT switch locations are indicated on the display panel, see Figure 3.
EX-5155-MOS ENMET Corporation 5.2 Calibration of the EX-5155-MOS Calibration is the process of setting the instrument up to read accurately when exposed to a target gas. The Zero function sets the clean air reference point and the Span function sets the sensitivity of the instrument. Initial Calibration: Wait 24 hours after initially supplying power to the EX-5155-MOS sensor/transmitter (S/T) before initial calibration.
EX-5155-MOS ENMET Corporation Table 3: Examples of Standard and Non-Standard Calibration Gas Gas Range Sensor Alarm 1* Alarm 2* Alarm 3* Part Number Span Calibration Gas Calibration Point Gas Type/ Standard Methyl Chloride 0 – 400 PPM 100 PPM 200 PPM 300 PPM 03015-000 100 PPM Methyl Chloride 100 PPM Methyl Chloride Carbon Monoxide 0 – 400 PPM 35 PPM 50 PPM 100 PPM 03011-000 100 PPM Carbon Monoxide 100 PPM Carbon Monoxide Hydrogen Sulfide 0 – 100 PPM 10 PPM 20 PPM 50 PPM 03015
EX-5155-MOS ENMET Corporation 5.2.1 Zero Adjust A ZERO function should be performed only when the EX-5155-MOS sensor/transmitter is exposed to fresh air. If the air at the sensor is in question, use a cylinder of 20.9% oxygen to provide a clean air reference. Attach the cylinder to the calibration adapter, fill the humidifier bowl halfway with water and allow gas to flow over the sensor for 3 – 4 minutes. Enter the maintenance menu by placing the magnet over MENU switch for 2 to 4 seconds.
EX-5155-MOS Normal Display Mode 5ppm ENMET Corporation HOLD the magnet over the MENU switch for 2 – 4 seconds to enter the Maintenance Menus MENU Exit Tap the SELECT switch to return to the Normal Display Mode. See Section 5.2.
EX-5155-MOS mA Span ENMET Corporation SELECT 100 MENU To return to Normal Gas Display: Tap MENU switch until EXIT is displayed Then tap SELECT switch To change mA Span set point: Tap the MENU switch until mA Span is displayed Tap the SELECT switch to display the set point The MENU switch changes digit indicated by underscore cursor The SELECT switch locks underscored digit and moves to next digit Figure 5: EX-5155-MOS Maintenance Menu Flow chart 5.
EX-5155-MOS ENMET Corporation 6.0 Replacement Part Numbers ENMET replacement part numbers: Description For EX-5155-MOS p/n 10014-018 Sensor Part Number 03015-000 03016-000 03018-000 03019-000 Consult ENMET Distributor or ENMET Corp for additional sensors Regulator 03700-008 Overlay 06000-058 Magnet 50030-001 Calibration/Sampling Adapter 03700-034 Calibration Gas, Consult ENMET Distributor or ENMET Corp. Regulator, Ammonia 03700-005 7.
EX-5155-MOS ENMET Corporation Addendum: Ammonia Calibration Calibration Procedure for EX-5155-MOSAmmonia The EX-5155-MOSAmmonia sensor requires special calibration techniques that are not common with other gases. All MOS sensors require at least 15% RH for proper operation. RH of 50% or greater is ideal for MOS sensor calibration. The common technique for humidifying dry gas from a cylinder is to bubble it through a humidifier assembly. However, ammonia is readily absorbed in water.
PO Box 979 680 Fairfield Court Ann Arbor, Michigan 48106-0979 734.761.1270 Fax 734.761.3220 Returning an Instrument for Repair ENMET instruments may be returned to the factory or any one of our Field Service Centers for regular repair service or calibration. The ENMET Repair Department and Field Service Centers also perform warranty service work.
Repair Return Form Mailing Address: ENMET Corporation PO Box 979 Ann Arbor, Michigan 48106 Phone Number: FAX Number: Shipping Address: ENMET Corporation Attn: Repair Department 680 Fairfield Court Ann Arbor, Michigan 48108 734.761.1270 734.761.
