ENMET Corporation PO Box 979 Ann Arbor, MI 48106-0979 ISA-200 RAL ISA-200 RAL O Operation and Maintenance Manual 80002-039 07/14/00 MCN-237, 09/20/00 MCN-274, 04/12/02
Table of Contents 1.0 INTRODUCTION................................................................................................................................1 1.1 Unpack................................................................................................................................................................................ 1 1.2 Check Order................................................................................................................................................
List of Illustrations FIGURE 1: F EATURES OF ISA-200 RAL(O) EXTERNAL ..........................................................................................3 FIGURE 1A: REGULATOR ...................................................................................................................................3 FIGURE 2: ISA-200 RAL(O) INTERIOR F EATURES .................................................................................................4 FIGURE 3: ISA-200 RAL(O) MOUNTING DIMENSIONS .........
ISA 200 RAL (O) ENMET Corporation 1.0 Introduction The ISA-200 RAL(O) is an instrument that monitors compressed air supply systems for certain hazards to the user. The instrument is available with sensors that monitor air for carbon monoxide (CO), for variations in the oxygen (O2 ) content. The sensors can be used alone or both used together.
ENMET Corporation ISA 200 RAL (O) 2.0 Instrument Features 2.1 Exterior Features The exterior of the instrument is shown in Figure 1. The exterior features are as follows: Feature Description Enclosure A NEMA-12 plastic box, approximately 10x8x6, with a clear hinged front cover. Sample Air Hose A six foot long hose to conduct a sample of the air from the source to the instrument. See Figure 1A. Sample Port The fitting for the sample air hose.
ISA 200 RAL (O) ENMET Corporation Cover, Humidifier Tube Visual Alarm CO Display Visual Alarm O2 If Oxygen option is installed Audio Alarm O2 % CO ppm Calibration Port OPTION Switch ALARM ACKNOWLEDGE ALARM DEFEAT Switch SELECT Switch OPTION AUDIO DEFEAT Power LED SELECT POWER Front Cover Latch FAULT Fault LED ALARM Flow Meter ACKNOWLEDGE Strain Relief for Line Cord Sample/Calibration Valve Sample Port Mounting Flanges 2 places Figure 1: Features of ISA-200 RAL(O) External Sample Air
ENMET Corporation ISA 200 RAL (O) 2.3 Circuit Board Features The Display Panel is hinged on the right and is released by unscrewing the 2 thumb screws located in the left corners. After releasing the panel, it is swung to the right, exposing the interior of the enclosure. The Circuit Board is mounted on a plate at the back surface of the enclosure interior. Features are shown in Figure 2.
ISA 200 RAL (O) ENMET Corporation 3.0 Installation 3.1 Mounting of Instrument The ISA-200 RAL(O) should be located near the pipe or tank containing the air to be monitored, and upstream from where the air is being used. So that, the air sample enters the instrument before it reaches the users. Upright (plumb and level) vertical orientation of the instrument is necessary for proper operation. Mount the instrument on an appropriate vertical surface using the mounting flanges provided.
ENMET Corporation ISA 200 RAL (O) 3.2 Sample Air Supply Tap the pipe or tank containing the breathing air and use appropriate fittings to connect the sample input hose. The instrument is designed to operate from an air supply pressure of 50-55 psig; adjust the regulator and set the pressure at 55 psig. The flowmeter on the display panel indicates approximately 2 SCFH when the input pressure is 55 psig. The sample air exits the instrument from two separated ports on the back surface of the enclosure.
ISA 200 RAL (O) ENMET Corporation In addition, there is a fault relay, which changes state whenever the instrument is in a fault condition. The contact positions are given in Table 2: Table 2: Fault Relay Contacts Position 13 14 15 Function Contact Fault Fault Fault NC C NO The coil of this relay is energized when the instrument is in the non-fault state; the contact conditions given above are for the non-energized state, which is identical to the fault state.
ENMET Corporation ISA 200 RAL (O) 4.0 Operation 4.1 Normal Operation Condition With the ISA-200 RAL(O) installed as described in section 3, and in clean air, the POWER green LED is on, the display is lit, the flowmeter reads approximately 2 SCFH, and the information on the display is as shown in Figure 4 Display, for the sensor(s) installed in the ISA-200 RAL(O). The red alarm and fault LEDs are not lit. CO PPM 000 20.
ISA 200 RAL (O) ENMET Corporation 4.4 Audio Defeat With the alarms in the non-latching configuration, pressing the ALARM ACKN/AUDIO DEFEAT switch during an alarm silences the audio alarm. With an alarm in the latching configuration, pressing the ALARM ACKN/AUDIO DEFEAT switch during an alarm silences the audio alarm and unlatches the associated relay(s). 4.5 Display In clean air, the display is as shown in Figure 4, for the sensor(s) installed in the ISA-200 RAL(O).
ENMET Corporation ISA 200 RAL (O) 5.0 Maintenance 5.1 Maintenance Menu The ISA-200 RAL(O) maintenance menu is accessed with the OPTION and SELECT switches. The maintenance menu diagram is shown in Figure 6 Maintenance Menu Flow Chart. From the operational display, press the OPTION switch twice; "run MAINTENANCE MODE" is displayed. Figure 6: ISA-200 RAL(O) Maintenance Menu Flow Chart.
ISA 200 RAL (O) ENMET Corporation 5.1.1 Key Entrance to the maintenance menu is guarded with a four-digit key. The factory default setting of the key is 1270. When a valid numerical key is inserted, the user is allowed to enter the maintenance menu. In the "run MAINTENANCE MODE" position § Press the SELECT switch; "KEY = 0000" is displayed. § In the "KEY = 0000" position, the underline cursor is under the left digit. § Press the OPTION switch to change the left digit; select the correct digit.
ENMET Corporation ISA 200 RAL (O) 5.1.2 Automatic Zeroing A valid key entry sets the instrument in the "run AUTOMATIC ZEROING" position, which enables the setting of the zero gas concentration point. This is desirable if the zero reference of one of the sensors has drifted over time. For CO, the zero reference point is 0000 ppm CO; the zero reference point for oxygen is 20.9% oxygen by volume. Note that the calibration procedure described in section 5.1.3 also includes setting the zero point.
ISA 200 RAL (O) ENMET Corporation § press the SELECT switch. § "ZERO = 30 .00V" is displayed. This is a timer that counts down from 30 seconds, at the end of that time the procedure is finished. The instrument sets the clean air voltage point for the CO sensor and the 20.9% O2 point for the oxygen sensor if it is present. It then examines the validity of these values; if they are valid, it goes back to the operational display.
ENMET Corporation ISA 200 RAL (O) After an invalid zero or calibration one of the following will be displayed in place of the PPM reading in the operational display: Table 5: Fault Alarm Displayed Cause Possible remedy • Fault 01 An invalid zero • Fault 02 An invalid calibration • Fault 03 An invalid zero and calibration ·verify proper zero gas is attached to calibration port and sample-calibration valve handle is up ·perform automatic zero ·change sensor in accordance with section 5.
ISA 200 RAL (O) ENMET Corporation 5.1.5 Set Latches To latch and unlatch the alarm relays, after inserting a valid key, press the OPTION switch three times; "set LATCHES" is displayed. § Press the Select switch; the particular alarm relay and its latch mode is displayed, for example, "RELAY: 10ppm CO, LATCH: no". § Use the OPTION switch to toggle the latch mode between "yes" and "no". Select the desired mode. See section 4.3. § Press the SELECT switch to step to the next relay.
ENMET Corporation ISA 200 RAL (O) 5.2 Sensor Replacement 5.2.1 CO Sensor A CO sensor must be replaced when it can no longer be calibrated. To replace a sensor, perform the following steps. § § § Turn off the electrical power. The sample air can continue to flow. Open the display panel and remove the two manifold retention screws and remove the manifold. See Figure 9. Remove the old CO sensor, which is the bottom most sensor, and replace it with a new sensor.
ISA 200 RAL (O) ENMET Corporation Manifold Sensor Bottom View Figure 8: Remove Shorting Clip Figure 9: Manifold Cover, Humidifier Tube Humidifier Tube Flow Control Orifice Oxygen Sensor Particulate Filter CO Voltage adjustment Potentiometer CO Sensor Figure 10: Location of Parts for Replacement 17
ENMET Corporation ISA 200 RAL (O) 6.0 Replacement Part Numbers ENMET part numbers for replacement parts: Part number 05221-001 64002-1000 67016-1106 67016-1204 73070-009 73108-002 03401-000 03219-020 03296-209 03700-022 73089-002 05219-001 05217-001 05320-001 Description Power Supply Circuit Fuse, 1.0 Amp 5x20mm Sensor, Oxygen Sensor, CO Orifice Humidifier Tube Calibration Kit Gas Cylinder, 20 ppm CO in air Gas Cylinder, 20.
ISA 200 RAL (O) ENMET Corporation 7.0 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.
ENMET Corporation ISA 200 RAL (O) Appendix A The Characteristics and Effects of Carbon Monoxide Carbon monoxide is a colorless odorless toxic gas generated by incomplete combustion of a hydrocarbon fuel in air. It may be present where internal combustion engines, furnaces, boilers, and other combustion devices are present. It is toxic when inhaled because of its great affinity to hemoglobin, the oxygen carriers in the red cells of the blood.
