Hach sc200, User Manual

Page: 272 / 875

Sensor:
• Automatically recognized when connected to a transmitter
• When removed, causes a "Sensor Missing" fault; this can be
corrected by:
• Reconnecting a sensor to that position or
• Manually taking the sensor 'off-line' via:
• Ultima X Controller, by sending a sensor disable command
• ModBUS command write to a control register.
• A missing sensor or unused sensor position returns a gas value of
-99.9 in response to a ModBUS request for gas level value starting
at address base +207.
Alarm Status Screen
(FIGURE 2-3)
In the North American version of the Ultima X with X3 Technology, a
screen will appear when a combustible sensor crosses 50%, 60% or
90% of the full-scale range.
• This screen:
• will override all sensor data or fault screens and will clear when
all sensors are below 50% of scale.
• can be acknowledged by the operator; the:
• instrument will go back to normal display operation until the
sensor or any other sensor crosses 50%, 60% or 90% of
scale
• normal operation status screen will display again.
• can be acknowledged through the:
• Ultima X Controller
• Pushbutton or
• MODBUS interface.
NOTE: All IR inputs will be functional and appropriate display
screens will display for the received IR message.
2-4