Instruction Manual GasWatch Portable Two-Gas Monitor Part Number: 71-0031RK Edition: First Released: January 1998 RKI Instruments, Inc.
Warranty RKI Instruments, Inc., warranties gas alarm equipment manufactured by RKI and sold by RKI to be free from defects in materials and workmanship for a period of one year from date of shipment from RKI Instruments, Inc. Any parts found defective within that period will be repaired or replaced, at our option, free of charge. This warranty does not apply to items that are subject to deterioration or consumption in normal service, and which must be cleaned, repaired, or replaced routinely.
Table of Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Sensors . . . . . . . . . . . . . . . . . . . . . . . . .
iv GasWatch Instruction Manual (Two-Gas)
Introduction The GasWatch is a portable gas monitoring device. It is offered in single-gas and two-gas versions. This instruction manual describes the two-gas version.
Description This section describes components of the GasWatch. Sensors The two-gas version of the GasWatch includes two of the following sensors (see Table 1). The sensors are above the display screen. Labels indicate the target gas of each sensor (CO, H2S, or O2). A dust cover protects each sensor from harmful objects in the monitoring environment. The sensor and dust cover are secured by the sensor retainer.
Control Buttons The control buttons are below the display screen.Table 2 lists the function of each button. Table 2: GasWatch Button Functions Button Function MODE/POWER • • • • • • • DISP • displays “second” target gas • enters time/date adjustment mode (with MODE/POWER button) AIR • adjusts the display reading to 0 (20.
Start Up 1. Press the POWER button until the alarm light turns on (approximately 3 seconds). The GasWatch temporarily tests all elements of the display screen, then displays the battery voltage. V . : After several seconds, the GasWatch automatically displays the toxic gas normal screen (CO or H2S), H 2S ppm . : then the GasWatch displays the oxygen normal screen. The GasWatch is in normal operation. O2 . % : Tip: You can test the oxygen sensor and alarm circuit by exhaling into the sensor.
Operation This section describes the GasWatch in normal operation. This section also describes procedures to display peak readings, and set the alarm points and time and date. Normal Operation The GasWatch continuously monitors the atmosphere and displays the concentrations present of one of the target gases. • Press the DISP button to display the second target gas. • Press the POWER/MODE button to turn on the display back light in dimly-lit areas.
4. Release the MODE button. 5. Adjust the alarm setting with the AIR and DISP buttons, then press the MODE button. The increasing oxygen alarm point displays. 6. Adjust the alarm setting with the AIR and DISP buttons, then press the MODE button. The toxic gas (H2S or CO) alarm point displays. 7. Adjust the alarm setting with the AIR and DISP buttons, then press the MODE button. The toxic gas STEL alarm point displays. 8.
Alarms This section describes the GasWatch’s gas, battery, and malfunction alarms. Table 3 lists the visual and audible indications for each type of alarm. (See Table 1, “Specifications,” on page 1 for the default gas alarm points.
Responding to over range alarms WARNING: An over range condition may indicate an extreme toxic gas or oxygen content condition. Confirm a normal condition with a different GasWatch or other gas detection device. 1. Determine which sensor is initiating the over range alarm. 2. Calibrate the sensor as described on page 9. 3. If the over range condition continues, replace the sensor as described on page 12. 4.
Calibration This section describes how to prepare for calibration, calibrate the GasWatch, and return to normal operation. This section also describes equipment that is necessary to perform the calibration procedure. Supplies and Equipment To calibrate the GasWatch, you will need the following supplies and equipment. RKI calibration kits are available for this purpose (see “Parts List” on page 14). • For the toxic gas sensor (CO or H2S), known calibrating samples of the target gas.
4. Allow the display reading to stabilize (approximately 1 to 2 minutes), then use the AIR and DISP buttons to adjust the display reading to match the concentration of the calibration sample. The AIR button increases the reading; the DISP button decreases the reading. NOTE: If you cannot adjust the display reading to match the calibrating sample, replace the toxic gas sensor as described on page 12. 5. Unscrew the regulator from the toxic gas cylinder. The display reading decreases. 6.
Maintenance Troubleshooting The troubleshooting guide describes symptoms, probable causes, and recommended action for problems you may encounter with the GasWatch. Fail condition Symptoms • CO/H2S: the gas reading is replaced by FAIL. • CO/H2S: the buzzer is sounding a double pulsing tone. • O2: the gas reading is 0.0% vol. • O2: the buzzer is sounding a pulsing tone. Probable causes • The sensor is missing or not plugged in properly. • The sensor requires calibration.
3. If the calibration/response difficulties continue, replace the affected sensor as described later in this section. 4. If the calibration/response difficulties continue after you replace the sensor, contact RKI Instruments, Inc., for further instruction. Replacing Components of the GasWatch This section describes procedures to replace the sensor, sensor dust cover, and batteries. WARNING: Perform the procedures described in this section in a non-hazardous environment. Replacing the sensor 1.
Accessories Arm Strap The GasWatch is supplied with a standard wrist strap. The arm strap is an optional accessory. You can use the arm strap to wear the GasWatch on your upper arm. To install the arm strap: NOTE: The wrist and arm straps are secured to the GasWatch by a bar. The bar is attached to the back of the GasWatch by two tabs. 1. Pull the wrist strap out of the strap loop at the bottom of the GasWatch. 2.
Parts List Table 4: Parts List 14 • Parts List Part Number Description 06-1248RK Calibration kit tubing (specify length in feet) 13-0101RK Wrist strap 13-0102RK Arm strap 21-1830RK Dust cover retainer 33-1004RK Sensor dust cover 49-1010RK Battery (1.
