User's Manual
Table Of Contents
- 1 Preface
- 2 Introduction
- 3 Product Overview
- 4 Ambient Network
- 5 Installation
- 6 Configuration
- 7 Deployment
- 8 Example Deployments
- 9 Firmware Upgrades
- 10 Troubleshooting
- 11 Appendices
User Manual
3000 SERIES 3
rd
GENERATION ACTIVE RFID
The change range has a hysteresis value Hc. This value is relative to the MIN
change
and MAX
change
thresholds. In the case that the temperature change was outside the specified range the change of
temperature of the next sample must be at least Hc degrees beyond the MIN
change
or MAX
change
threshold to be considered in range again. Having this hysteresis can prevent rapid change in alarm
status when there is a small fluctuation in temperature change around the threshold value.
The values for the change alarm driver settings are expressed as degrees Celsius per sample period.
The following graph (Illustration 22) depicts the generic behaviour of the change alarm mechanism.
The graph shows the time interval between two samples. The sample at T
now
is tested for its position
relative to the value of the MAX
change
and MIN
change
lines at T
now
.
The following graph (Illustration 23) depicts the behaviour of the change alarm mechanism for a
specific temperature curve. In this case alarms are configured to be generated when the temperature
is outside the specified range. For every sample (the green dot) the generic picture above is drawn to
visualize the change relative to the chosen thresholds.
39/73 Ambient Systems B.V.
Illustration 22: Hysteresis