Figure 2: Status Page
• Overviews emphasized potential problems and backgrounded normal conditions.
• Alerts notified staff when temperatures were too hot or too cold over
a period of time.
• Reports were needed to be compared against paper records, long-term trend evaluation, and analysis.
• The sensor reporting rate was too frequent and needed to be
reduced to at most once every three minutes.
• A second base station was added to room 138 because two sensors
were too far apart to provide reliable communication.
• The precision of the sensors (originally 1°C) was too low, causing
large “jumps” in the reported values.
WINLAB updated and upgraded the system by adjusting the granularity of the temperature reading from 1°C to 0.1°C, added a light sensor, and increased the reporting interval from 15 seconds to five minutes.
Software was updated to send out an alert to the facility manager whenever temperatures were too hot or too cold for more than ten minutes.
Daily and monthly min/max reports were automatically e-mailed for
comparison to paper records. With these updates in place, 33 additional
sensors were installed—ten placed in the rooms already containing sensors to evaluate the consistency of readings, 22 installed in additional
rooms, and one used as a “floating” sensor by a veterinarian. The result
was a system that functioned well for CMR for several months.
In March of 2013, the central heating plant high temperature water
supply was scheduled to be shut down for a week in mid-May for system maintenance, creating a significant challenge for CMR staff. Fresh
air supplies at many of the facilities are temperature-regulated using a
two-part system. Initially, outside air is chilled to 50°F and distributed
throughout the building. Before each room, a hot water unit reheats the
air to the appropriate temperature. This technique reduces humidity, and
allows individual adjustment of room temperatures. Unfortunately, the
one-week maintenance period meant that animal rooms would need to
be reheated via alternative means.
By the end of April CMR decided to install an operation monitoring