HF127PEN_EL_TA_v0501_04
Page 17
6 - POWER MANAGEMENT
When used with the internal battery option, the user can expect reliable measurement over a long
period of time. The F127-P has several smart power management functions to extend the battery life
time significantly. Two of these functions can be set:
LCD NEW
61
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; every pulse will be
counted and the output signals will be generated in the normal way.
The following can be selected:
Fast - 1 sec - 3 sec - 15 sec - 30 sec - off.
Example 3:
Battery life-time
battery life-time with a coil pick-up, 1KHz. pulses and FAST
update: about 2 years.
battery life-time with a coil pick-up, 1KHz. pulses and 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
62
The unit has two modes: operational or shelf.
After "shelf" has been selected, the unit can be stored for several years; it
will not count pulses, the display is switched off but all settings and totals
are stored. In this mode, power consumption is extremely low.
To wake up the unit again, press the SELECT-key twice.
7 - FLOWMETER
SIGNAL A
71
The F127-P is able to handle several types of input signal. The type of
flowmeter pickup / signal for input A is selected with SETUP 71.
Note:
The selections "active pulse" offer a detection level of 50% of the
supply voltage.
Read also par. 4.4.3. Flowmeter input terminal 09-11.
SIGNAL B
72
The F127-P is able to handle several types of input signal. The type of
flowmeter pickup / signal for input B is selected with SETUP 72.
Note:
The selections "active pulse" offer a detection level of 50% of the
supply voltage.
Read also par. 4.4.3. Flowmeter input terminal 12-14.
TYPE OF SIGNAL
EXPLANATION
RESISTANCE
FREQ
.
/
M
V
REMARK
NPN
NPN input
100K
pull-up
6 kHz.
(open collector)
NPN - LP
NPN input
with low pass filter
100K
pull-up
2.2 kHz.
(open collector)
less sensitive
REED
Reed-switch input
1M
pull-up
1.2 kHz.
REED - LP
Reed-switch input
with low pass filter
1M
pull-up
120 Hz.
Less sensitive
PNP
PNP input
100K
pull-down
6 kHz.
PNP - LP
PNP input
with low pass filter
100K
pull-down
700 Hz.
Less sensitive
NAMUR
Namur input
820 Ohm
pull-down
4 kHz.
External power
required
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