Operation
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SafeCheck 200 Operator’s Manual
19
• Span Adjust:
This menu allows you to set the concentration of the calibration gas used
to calibrate each of the sensors. The unit then uses
the concentrations entered here during either of the
calibration options. When Span Adjust is selected
from the main CAL. menu, the installed sensor list appears in the top line
of the display. The first sensor installed is highlighted and it's calibration
concentration appears. Using the ▼ arrow key to move across the top line
will step through and show the calibration concentration for all installed
sensors.
To change a calibration concentration use the ▼ arrow key to select a
sensor and press the I/O key. Use the arrow
keys to change the calibration concentration and
the I/O key to accept it.
O2 LEL
20.9
O2 Span:20.9
Use
to change
QuestSensor Information
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SafeCheck 200 Operator’s Manual
20
4. QuestSensor INFORMATION
The SafeCheck 200 has the capacity for an oxygen sensor and a com-
bustible sensor. Each one of these sensors is an intelligent sensor and contains
information pertinent to it's operation. Information relating to alarm setpoints are
stored in the sensor. You may install less than two sensors, and your unit will
still perform all of the necessary functions for the gases you need to monitor.
The unit can simultaneously handle the following QuestSensor combinations:
1. Up to two, a combustible sensor and an oxygen sensor.
The oxygen sensor and the combustible sensor each have their own partic-
ular sockets into which only they will fit.
Note
: If using less than two sensors in the SafeCheck 200 a dummy sensor
(054-899) must be placed in the empty sensor position to maintain the
unit to environment sealing capability.
4.1 Changing or Installing the QuestSensors:
Note: Turn the unit off before performing this operation. Install the sensors
in a non-hazardous area. When you change the sensors, remember to
calibrate them after a warm-up period of several hours, which allows
them to stabilize.
Using a screwdriver, loosen the quarter turn fastener which secures the unit's
sensor cover.
The oxygen sensor only fits in the position labeled Sensor 1. Line up the pins
with the socket and press it in.
The combustible sensor only fits in the position labeled Sensor 2. Line up the
pins with the socket and press it in.
Once the sensors are in place, replace the cover and tighten the 1/4 turn fastener
to secure the cover.
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