Kona Home Sensor TRM
T0005370_TRM
Version Rev-C 1.0
TEKTELIC Communications Inc.
Confidential
Page 31 of 34
3.4.7
Moisture Configuration
Base and External Connection Home Sensors are equipped with a capacitance-based moisture
detection system. This allows the Home Sensor to detect the pooling of water (water line leak,
spills, etc.) and report moisture detection events. The Moisture transducer is integrated into
the Home Sensor enclosure base (screw side) and can sense moisture without making physical
contact with the liquid. This transducer does not measure humidity in air. Table 3-16 shows a
list of Moisture transducer configuration registers.
Table 3-16: Moisture Transducer Configuration Registers
Address Access Value
Size
[bytes]
Description
0x5A
R/W
Sample Period
1
Period of moisture measurement
0x5B
R/W
Threshold
1
Moisture detection threshold
0x5C
R/W
Enable/Disable
1
Moisture sensing enabled/disabled
Only Bit 0 is considered. Other bits are
ignored.
0x5D
W
Calibrate Baseline
1
Command to calibrate the transducer as
“
dry
”
3.4.7.1
Sample Period
The Moisture transducer is activated periodically to determine if water is present. A smaller
sample period results in a faster response from the Sensor in the event of a leak, however it
results in higher battery usage than a larger sample period.
Supported Sample Periods are as follows:
•
1: 16 seconds
•
2: 32 seconds
•
3: 64 seconds
•
4: 128 seconds
A value of 0 (zero) or greater than 4 is ignored.
Note:
Updates to the Sample Period require the Moisture transducer to be de-initialized and
then initialized in order to take effect.
3.4.7.2
Threshold
The Threshold of the Moisture transducer determines the tripping point for various conditions.
Nominally, a 1/4” of water below the Home Sensor results in a shift of about 300 units from the