ENMET Corporation PO Box 979 Ann Arbor, MI 48106-0979 PID-GUARD Compressed Air Line Hydrocarbon Monitor Manual Manual Part Number 80002-050 MCN-383, 11/05/07
Table of Contents 1.0 INTRODUCTION........................................................................................................................................................ 1 1.1 UNPACK....................................................................................................................................................................................1 1.2 CHECK ORDER ...................................................................................................................
PID-GUARD ENMET Corporation 1.0 Introduction The PID-GUARD is a compressed air monitoring instrument that measures and detects Hydrocarbons in industrial compressed air systems utilizing a photoionization sensor. Hydrocarbons (HC) are limited to gases with an ionization potential of 10.6 eV or less. See Appendix A for a list of gases and IPs. The PID-GUARD is NOT in an enclosure rated for use in a Class I, Div 1, Groups B, C, D classified area and CAN NOT be installed in a hazardous location.
PID-GUARD ENMET Corporation 2.0 Components of the PID-GUARD 2.1 PID-GUARD elements See Figure 1 for location of elements: Feature Description Enclosure A polycarbonate box, approximately 7 x 5 x 3, with a detachable front cover. 4 holes for mounting the enclosure to a vertical surface. Located at the corners of the bottom of the enclosure, directly beneath the 4 front cover retaining screws. See Figure 3 Input Port The entrance for the air sample and calibration gas.
PID-GUARD ENMET Corporation Visual Indicator Power/Fault Visual Indicators: Alarm1, Alarm2, Alarm3 Output Port Pushbutton Switches Menu Select Audio Alarm Flowmeter Front Cover Retaining Screws 4 places Strain Relief Input Port Figure 1: External PID-GUARD Features Regulator Female Quick Release Fitting to Inlet Port ¼“ NPT Figure 1a: Optional REGULATOR AND SAMPLE AIR HOSE 3
PID-GUARD ENMET Corporation 2.3 Circuit Board Features The Display Panel is attached by a cable and is released by unscrewing the 4 screws located in the corners. After releasing the panel, it is swung upward, exposing the interior of the enclosure. The Circuit Board is mounted at the back surface of the enclosure interior. Features are shown in Figure 2. Feature Relay Terminals Output Terminals PCB/Sensor Manifold Description This group of terminals is located on the Circuit Board.
PID-GUARD ENMET Corporation 3.0 Installation The PID-GUARD should be located near the pipe or tank containing the air to be monitored, and upstream from where the air is being used. The PID-GUARD must be installed such that it samples the compressed air before it reaches the users. 3.1 Mounting PID-GUARD Mount the PID-GUARD instrument on an appropriate vertical surface, leaving room for lid to be opened, using the mounting holes provided. Avoid areas with excessive vibration or temperature extremes.
PID-GUARD ENMET Corporation 3.2 Wiring the PID-GUARD The electrical installation should conform to appropriate electrical codes, such as the National Electrical Code in the United States. WARNING: The compliance of the installation to appropriate codes is not ENMET’s responsibility. The PID-GUARD should be powered through circuit breakers provided for this purpose. 3.2.1 Air Supply Tap the pipe or tank containing the air and use appropriate fittings to connect the sample input hose.
PID-GUARD ENMET Corporation 3.2.3 Relay Contacts Relay contacts are available for each alarm; these are SPDT, rated at 10Amp at 110VAC, and may be latching or non-latching as required by the application. They are accessed on the terminals next to each relay see Figure 5. The contact positions are noted on the circuit board next to each terminal. The following table is for the relays in their un-energized state. This is also the alarm condition state.
PID-GUARD ENMET Corporation 4.0 Operation When the PID-GUARD is installed as described in Section 3, and in clean air, the POWER green LED is on, the display is lit and the information on the display is measurement of hydrocarbon detected by the PID-GUARD. The red alarm and fault LEDs are not lit. 4.1 Start Up PID-GUARD When the PID-GUARD is first powered up, it goes through a series of momentary screens, which identify the instrument model number, serial number and software revision.
PID-GUARD ENMET Corporation 4.2 Normal Display Mode When the PID-GUARD is installed as described in section 3, and in clean air, the POWER green LED is on, the display is lit and the information on the display is measurement of hydrocarbon detected by the PID-GUARD. The red alarm and fault LEDs are not lit. To advance through displays of operational information press the MENU button.
PID-GUARD ENMET Corporation 5.0 Maintenance The PID-GUARD maintenance menus that are accessed by pressing the MENU button and entering a valid access code. The access code is set at the factory and may be changed by following the access code menu explained in section 5.5. 5.1 Maintenance Menus CAUTION: Do Not Attempt A Span Procedure Without Calibration Gas Applied to The Sensor; if this is done, the instrument is forced into a calibration fault mode.
PID-GUARD ENMET Corporation 5.2 PID-GUARD Maintenance Adjustments Pushbutton switches control the MENU and SELECT functions. The MENU and SELECT button locations are indicated on the display panel, see Figure 3. The MENU button is used to display the various menu options and make incremental changes to numbers such as alarm points, calibrations gas, etc. The SELECT button is used to select that option, set zero or span digit.
PID-GUARD ENMET Corporation 5.2.3 Gas Span Calibration It is recommended that the Zero Function be performed first. Do not perform a calibration unless span gas is applied to sensor. Calibration can be aborted by pressing and holding the MENU button for 3 – 4 seconds. 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.
PID-GUARD ENMET Corporation Enter the maintenance menu. See Figure 7, PID-GUARD Maintenance Menu flow chart. 1. Press the MENU button until Span display. 2. Press the SELECT button to perform a Span procedure. The display will alternate between the calibration gas concentration (Cal 20) and a signal level (PV). To Abort calibration press and Hold MENU button for 3 – 4 seconds, Abort? will appear, press SELECT button to return to Span.
PID-GUARD ENMET Corporation 5.2.4 Alarm Set Points The PID-GUARD alarm set points can be changed within limits. To change any of the three alarm points: Enter the maintenance menu as shown in Figure 7 PID-GUARD Maintenance Menu flow chart. 1. Press the MENU button until to display Alarm1 is displayed. 2. Press the SELECT button to initiate alarm set point change 3. Press the MENU button to change the digit indicated by the underscore cursor 4.
PID-GUARD Normal Gas Display ENMET Corporation 5ppm MENU Exit MENU Zero Press and HOLD the MENU button for 2 – 4 seconds to enter the Maintenance Menus SELECT Press the SELECT button to return to the Normal Gas Display. See Section 5.2.1 Press the MENU button to advance through Maintenance Menus cycle SELECT PV: Cal MENU Span SELECT 0 Press the SELECT button to initiate Zero adjustment If the Zero signal is within Preset Specs the PID-GUARD will display Cal OK, See Section 5.2.
PID-GUARD ENMET Corporation 5.4 Sensor Replacement WARNING: Power must be removed from the PID-GUARD before this or any internal procedure. Failure to do so may cause damage to equipment, bodily injury or death. Sensors should be replaced when they can no longer be calibrated. Replacement sensor part numbers are listed in Section 6.0 of this manual.
PID-GUARD ENMET Corporation 6.0 Replacement Parts ENMET replacement part numbers: Description of Part Sensor PID Calibration Regulator, for 17 liter, cylinder Zero Gas, 20.9% O2, 17 liter Sampling Regulator w/hose, quick disconnect Sampling Hose w/quick disconnect Horn Part Number 03028-000 03700-500 03296-209 03412-003 03412-004 62013-007 Calibration Gas, Consult ENMET Distributor or ENMET Corp. 7.0 Technical Data and Specifications Electrical Power 15 Amp fused branch circuit 100-240 VAC 0.
PID-GUARD ENMET Corporation 8.0 WARRANTY ENMET warrants new instruments to be free from defects in workmanship and material under normal use for a period of one year from date of shipment from ENMET. The warranty covers both parts and labor excluding instrument calibration and expendable parts such as calibration gas, filters, batteries, etc... Equipment believed to be defective should be returned to ENMET within the warranty period (transportation prepaid) for inspection.
PID-GUARD ENMET Corporation Appendix A: Gas Ionization Potentials Chemical Name A IP (eV) Chemical Name IP (eV) p-Bromotoluene 8.67 2-Amino pyridine Acetaldehyde Acetamide Acetic acid Acetic anhydride Acetone Acetonitrile Acetophenone 8.00 10.21 9.77 10.69 10.00 9.69 12.20 9.27 p-tert-Butyltoluene s-Butyl amine s-Butyl benzene sec-Butyl acetate t-Butyl amine t-Butyl benzene trans-2-Butene 8.28 8.70 8.68 9.91 8.64 8.68 9.
PID-GUARD ENMET Corporation Chemical Name (D continued) IP (eV) Chemical Name F IP (eV) Decaborane Diazomethane Diborane Dibromochloromethane Dibromodifluoromethane Dibromomethane Dibutylamine Dichlorodifluoromethane (Freon 12) Dichlorofluoromethane Dichloromethane Diethoxymethane Diethyl amine Diethyl ether Diethyl ketone Diethyl sulfide Diethyl sulfite Difluorodibromomethane Dihydropyran Diiodomethane Diisopropylamine 9.88 9.00 12.00 10.59 11.07 10.49 7.69 12.31 12.39 11.35 9.70 8.01 9.53 9.32 8.
PID-GUARD ENMET Corporation Chemical Name M IP (eV) Chemical Name (P continued) IP (eV) 2-Methyl furan 2-Methyl napthalene 1-Methyl napthalene 2-Methyl propene 2-Methyl-1-butene 2-Methylpentane 3-Methyl-1-butene 3-Methyl-2-butene 3-Methylpentane 4-Methylcyclohexene Maleic anhydride Mesityl oxide Mesitylene Methane Methanethiol (methyl mercaptan) Methyl acetate Methyl acetylene Methyl acrylate Methyl alcohol Methyl amine Methyl bromide Methyl butyl ketone Methyl butyrate Methyl cellosolve Methyl chlorid
PID-GUARD ENMET Corporation Chemical Name (T continued) IP (eV) Chemical Name W IP (eV) Trimethyl amine Tripropyl amine 7.82 7.23 Water 12.59 2,4-Xylidine 7.65 8.20 9.82 10.12 9.19 9.80 10.00 8.93 m-Xylene o-Xylene p-Xylene 8.56 8.56 8.
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.
