1.3.5 Control Panel
The Control Panel serves as the main user interface. The Control Panel features the keypad
(ramp-UP, ramp-DOWN, and MODE keys) and the status LED’s. The control panel is designed to
be splash and water-resistant. There are #8-32 threaded mounting studs at each of the four
corners for flush mounting of the model 1100 to a stationary control or equipment panel. The
gasketed panel is suitable for NEMA type 4/IP20 environments when properly installed.
1.3.6 Sensor
The sensor is an electrochemical cell, which measures partial pressure of oxygen. Sample gas is
passed by the face of the sensor and an electrical output is generated, which is directly
proportional and linear to the partial pressure of oxygen in the gas sample. It is similar in operation
to a battery, except that one of the reactants, oxygen is supplied externally to the cell.
The MAX-250 Oxygen sensor consists of a lead anode, oxygen cathode, and weak acid
electrolyte. Oxygen permeates a plastic membrane on the face of the sensor. The oxygen is
electrochemically reduced at the cathode. The current generated is directly proportional to the
partial pressure of oxygen at the sensing surface of the cell.
The MAX-250 sensor is a sealed disposable device with a serviceable life of 2 to 3 years. It does
not require any periodic maintenance. When the sensor has expired, the entire device is disposed
of and replaced easily and safely.
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