ENMET Corporation PO Box 979 Ann Arbor, Michigan 48106-0979 SPECTRUM-DC-RAL Compressed Air Line Carbon Monoxide Monitor Instrument Manual 80002-035 08-22-97 MCN 192 04-24-98
Table of Contents 1.0 DESCRIPTION AND GENERAL INFORMATION ............................................................................................................ 4 1.1 UPON RECEIPT .......................................................................................................................................................................4 1.1.1 Unpack ................................................................................................................................................
List of Illustrations • • • • Figure 1 Figure 2 Figure 3 Figure 4 Carbon Monoxide Monitor Features Operation Menu Diagram Maintenance Menu Diagram % COHb vs.
PUSHBUTTON SWITCHES SENSOR HOUSING POWER-----OPTION-----SELECT BACKLIGHT VISUAL ALARM SAMPLE INPUT (LUER DISCONNECT) DISPLAY CORD TO AUDIO ALARM Figure 1: Carbon Monoxide Monitor Features 1
Operational Display S XXXX O S Batt=OK* O Acknowledge Alarm No Function *may also be “low” or “LOW” Alm=XXXX S O No Function S See DATA Max=XXXX O S No Function S No Function S Reset Data O go Setup Min=XXXX O Clr DATA O O Maintenance Menu Key XX YY ° C O = Option Switch S = Select Switch O Figure 2 Operation Menu Diagram 2 S No Function
To Operational Display From Operational Display go SETUP S O Changes digit indicated by underscore cursor S Key=0000 INVALID VALID run ZERO S Locks underscored digit and moves cursor AIR SET? O O, to Exit S VALID z30:0.0v run CAL S To Operational Display INVALID O, To Exit AIR SET? S O O, S, No Function z30:0.0v O, No Function GAS=XXXX O S Changes digit indicated by underscore cursor S C-FAULT GAS SET? O, To Exit S Locks underscored digit and moves cursor VALID XXX:Y.
1.0 Description and General Information The SPECTRUM-DC-RAL carbon monoxide monitor is a small battery operated instrument for the detection of carbon monoxide gas in compressed air lines. An electrochemical cell detects the gas, and the gas concentration is displayed on an LCD. Audio and visual alarms occur when the gas concentration exceeds a preset alarm point. At relatively low concentrations of CO, an alarm can be acknowledged, which results in the temporary cessation of the audio alarm.
2.0 Features and Operation The features of the SPECTRUM-DC-RAL Carbon Monoxide monitor are shown in Figure 1. These are: DISPLAY an LCD upon which either the gas concentration, or prompts for the operational and maintenance menus, are given. PUSHBUTTON there are three of these, as follows: SWITCHES POWER/ BACKLIGHT the left hand switch OPTION the middle switch SELECT the right hand switch These switches are used to access and utilize the operational and maintenance MENUS.
2.1.1.2 Air Supply If the model without a regulator is ordered, supply air at approximately 20 PSIG at a flow rate of approximately 1.0 SCFH. If the regulator is supplied, the male quick disconnect pneumatic connector on the regulator-flowmeter assembly is a Milton 1000 series. Plumb the associated female connector into the air line. Connect the regulator-flowmeter and set the pressure at approximately 20 PSIG, and the flow at 1.0 SCFH. 2.1.1.
2.1.5 Data The SPECTRUM-DC-RAL monitor retains the maximum and minimum gas concentration values encountered since turn-on, or since the data was cleared and reset. There is a one minute delay from the time the instrument is turned on until when it starts storing the information. To access this press the OPTION switch three times; "see DATA" is displayed. Press the SELECT switch; the maximum concentration since turn-on or last reset is displayed.
2.2 Interference Gases Some gases other than CO cause a sensor response, and thus are termed "interference gases".
3.0 Maintenance 3.1 Maintenance Menu From the gas operational display, push the OPTION button four times; "go SETUP" is displayed. This is the entrance to the maintenance menu. The maintenance menu diagram is shown in Figure 3. 3.1.1 Key Entrance to the maintenance menu is guarded with a four digit numerical key. The factory default setting of the key is 1270. When the valid numerical key is inserted, the user is allowed to enter the maintenance menu.
3.1.3 Calibration NOTE: Calibration should be performed at normal room temperature (20-25°C) for optimal performance. If the instrument is exposed to temperature extremes just prior to calibration, it should be allowed to stabilize to room temperature. The internal temperature of the instrument can be verified by cycling through the "see DATA" menu. In order to calibrate the instrument, it is first zeroed as described above.
For the safety of the user, there is an upper limit past which the alarm setting is invalid, and the instrument does not accept it. If an invalid alarm setting is attempted, after the numerical value is inserted in the "ALM=0000" window, pressing the OPTION or SELECT button results in a momentary display of "INVALID" after which the display returns to the alarm update window.
The initial calibration of a new sensor must be performed with the front cover of the enclosure removed. A calibration cup is provided with the calibration kit. Follow the procedure for calibrating the instrument as outlined in Section 3.1.3 of this manual with the following modification. During the application of the span gas, the counter counts down from 120.
4.0 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.
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.
