RKI Instruments SC-01 - Manual (Page 13)

SC-01 Operator’s Manual Description • 8
Printed Circuit Boards
The primary function of the SC-01 printed circuit boards is to amplify the
signal sent to them from the sensor, convert the signal to a meaningful
measurement of gas concentration, display the gas concentration on the
LCD, store peak gas readings, STEL and TWA values, and activate the
alarm circuit if an alarm point has been reached. They monitor battery
level, battery failure, and sensor failure. They also control the various
operating modes of the unit.
NOTE: The printed circuit boards contain no user serviceable parts.
Alarm LEDs
The SC-01 has four red alarm LEDs. They alert you to gas, low battery, and
sensor failure alarms. They are located on the front of the SC-01 above the
display behind a frosted plastic lens.
Buzzer
A solid-state electronic buzzer is mounted inside the SC-01. An opening in
the lower right corner of the case front allows the buzzer’s sound to
emanate from the case. The buzzer sounds for gas alarms, unit
malfunctions, and dead battery alarm. It also serves as an indicator during
normal use of the various LCD display options.
Vibrator
A vibrating motor (vibrator) is mounted inside the SC-01. The vibrator
vibrates momentarily during the power-up sequence and for gas alarms.
Batteries
Two AA-size alkaline batteries run the SC-01. At 25°C with no alarms, the
▲ DISP
• Turns the LCD back light on.
• Enters and scrolls through Display Mode when the
SC-01 is in Measuring Mode.
• Increases a parameter’s value or changes a
parameter’s setting when a parameter is available
for adjustment in an operational mode.
POWER
• Turns the unit on and off.
• Turns the LCD back light on.
• Resets the alarm circuit (gas alarms).
• Enters Setup Mode with the AIR button.
Table 2: SC-01 Control Buttons
Button Function