HF040TEN_v0402_03 Atex_IECEx_CSA_FM
Page 12
3 - POWER MANAGEMENT
When used with the internal battery option, the user can expect reliable measurement over a long
period of time. The F040-T has several smart power management functions to extend the battery life
time significantly. Two of these functions can be set:
LCD NEW
31
The calculation of the display-information influences the power
consumption significantly. When the application does not require a fast
display update, it is
strongly advised
to select a slow refresh rate.
Please understand that NO information will be lost; the input signal will be
processed and the output signal will be generated in the normal way.
The following can be selected:
Fast - 1 sec - 3 sec - 15 sec - off.
Example battery life-time:
battery life-time with a FAST update: about 3 years.
battery life-time with a 1 sec update: about 5 years.
Note:
after a button has been pressed by the operator - the display
refresh rate will always switch to FAST for 30 seconds. When "OFF" is
selected, the display will be switched off after 30 seconds and will be
switched on as soon as a button has been pressed.
BATTERY-MODE
32
The unit has two modes: operational or shelf.
After "shelf" has been selected, the unit can be stored for several years; it
will not process the sensor signal; the display is switched off but all
settings are stored. In this mode, power consumption is extremely low.
To wake up the unit again, press the SELECT-key twice.
4 - SENSOR
NR. OF WIRES
41
The PT100 element used can have 2, 3 or 4 wires. Do select the
appropriate type.
FILTER
42
The output signal of a sensor does mirror the actual temperature. This
signal is measured several times a second by the F040-T. The value
measured is a "snap-shot" of the real temperature as it will be fluctuating.
With the help of this digital filter a stable and accurate reading can be
obtained while the filter temperature can be set to a desired value.
The filter principal is based on three input values: the filter temperature
(01-99), the last measured analog value and the last average value. The
higher the filter value, the longer the response time on a value change will
be. Below, several filter levels with there response times are indicated:
F
ILTER VALUE
R
ESPONSE TIME ON STEP CHANGE OF ANALOG VALUE
.
T
IME IN SECONDS
50%
INFLUENCE
75%
INFLUENCE
90%
INFLUENCE
99%
INFLUENCE
01
filter disabled
filter disabled
filter disabled
filter disabled
02
0.3 seconds
0.5 seconds
1.0 seconds
1.8 seconds
03
0.5 seconds
1.0 seconds
1.5 seconds
3 seconds
05
1.0 seconds
1.8 seconds
2.8 seconds
5.3 seconds
10
1.8 seconds
3.5 seconds
5.6 seconds
11 seconds
20
3.5 seconds
7.0 seconds
11 seconds
23 seconds
30
5.3 seconds
10 seconds
17 seconds
34 seconds
50
8.8 seconds
17 seconds
29 seconds
57 seconds
75
13 seconds
26 seconds
43 seconds
86 seconds
99
17 seconds
34 seconds
57 seconds
114 seconds