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The sensor takes individual instant temperature measurements, however can
also provide a weighted average, used to better approximate the product
temperature. The logic for the alarms and all the other functions depends on
the instant temperature measurement.
Wireless communication is activated automatically in the following situations:
•
moving the CLEAN mode switch (SW2);
•
stimulating the magnetic switch (SW1).
In all other cases, data transmission is defi ned by the set transmission cycle.
Note:
•
The temperature measurement, with the update of the instant and average
values, is performed at 1 minute intervals.
Important: the value is displayed on the supervisor after the set sensor
transmission time .
The average temperature value is calculated using the following formula:
Temp_AVG = (Temp_AVG-1 * (M - 1) + Temp_Ist) / M
Where:
•
Temp_AVG-1
Previous average temperature value
•
Temp_Ist
Instant temperature measurement
•
M
Average weight (= AVERAGE_PARAM)
The average function also introduces an average measurement delay with a
time constant equal to the average weight value (in minutes).
High temperature alarm function:
HI_TEMP_TRESHOLD
LO_TEMP_TRESHOLD
Start counter alarm delay
Reset counter alarm
Alarm delay
HIGH_TEMP_DELAY
•
When the threshold is exceeded, the alarm is signalled only if this persists
for a time greater than the delay set;
•
If the temperature returns within the threshold before the delay time, the
accumulated count is reset;
•
The alarm is reset instantly when the temperature returns within the
threshold.
Default values for the modes settable for the MODE_PARAM
parameter
MODE 0
MODE
Generic use
1LOW
showcases
High temp. thre-
-15 °C
-15 °C
shold
Low temp. thre-
-40 °C
-40 °C
shold
HACCP delay
180 min.
120 min.
Average weight
1 (Instant)
16 (16 min.) 8 (8 min.)
Automatic confi guration procedure
The automatic recognition procedure is used to recognise the type of
showcase and consequently confi gure the parameters for the showcase
that the sensor is installed on. The automatic recognition cycle is activated (if
enabled by EN_AUTO_CONF):
•
When the temperature falls below the threshold MODE_AUTO_TRESH;
•
When returning from CLEAN mode, closing the switch;
•
When a previous cycle is completed.
When the AUTO_DELAY time has elapsed, if the following conditions are true:
•
Final temperature rise less than 1°C/h;
•
Final temperature within a fi xed band of temperatures for the various types
of showcase:
-
medium temp. showcases = from -2°C to + 6°C
-
low temp. showcases = less than -10°C.
The MODE_PARAM parameter is given the new value corresponding to the
type of showcase and the associated values for the alarm thresholds, alarm
delay and average weight are loaded;
HI_TEMP_ALM_1
LO_TEMP_ALM_1
Alarm ON
EN_HI_TEMP_ALM
Alarm delay
HIGH_TEMP_DELAY
Fig. 2.d
MODE
MODE 3MED
2MED
shelf cases
showcases
+10 °C
+8 °C
-2 °C
-2 °C
120 min.
120 min.
12 (12 min.)
Note:
•
In the event of increases in temperature for low temperature showcases,
the recognition procedure is disabled for 3 times the value of AUTO_DELAY,
to avoid false recognitions.
•
The temperature alarms are always enabled, if MODE_PARAM and
consequently the associated parameters are changed, the alarm logic
depends on the new parameters.
•
The parameters associated with each mode (0-3) are saved separately and
permanently, and are loaded automatically when the mode is changed.
•
The values of the parameters associated with the mode must be set (by the
supervisor) making sure that MODE_PARAM does not change, otherwise
the values transferred may be ignored.
2.4 Technical specifi cations
Power supply
Maximum power input
Battery life in normal operating
conditions
Radio frequency specifi cations
Operating conditions
Storage conditions
Precision of temperature measu-
rement
Response time to temperature
Time
variations
Index of protection against atmo-
spheric agents
Classifi cation according to protec-
tion against electric shock
Environmental pollution
PTI of insulating materials
Period of stress across the insula-
ting parts
Category of resistance to heat
and fi re
Immunity against voltage surges
Software class and structure
Disposal
Product code
Accessories
Tab. 2.d
15
3.6V 2500 mAh lithium battery, "AA" size
100 mW
From 3 to 8 years, depending on the tran-
smission time set.
(CAREL is not responsible for the specifi ed
battery life)
Frequency: selectable from 2405 to 2480 MHz
Power transmitted: 0dBm
Wireless protocol: ZigBee
-40T50°C
-20T60°C
humidity range: <80% RH non-condensing
± 1 °C -10T30°C;
± 2 °C -30T40°C
> 20 minutes
Compliant with EN 13485
IP65
Can be integrated into class I or class II
appliances
Normal
250 V
Long
category D (box and cover)
category 1
Class A
observe local legislation for the disposal of
electrical material
WS01U01M0 - Wireless sensor ver. BP SE IP65
-40 to 50°C
WS00BAT000 Battery
WS00B01000 Plastic case only
0000000722 Magnet for activating SW1
"Wireless probes" +0300030EN - rel. 1.0 - 16.07.2010
ENG
Tab. 2.e
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