KROHNE UFM 500 EN - Manual (Page 28)

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5.8 Frequency output F
5.8.1 Application F (fct. 3.4.1)
Application F Setting
via fct.3.4.1 or 3.3.1 Other functions
set via fct.3.4.6 to 3.4.8 Characteristic
of outputs,
see sect. 5.8.3
F
3.4.1 I
3.3.1 SMU F
3.4.6 to 3.4.8
1 flow direction 1. DIR any possible F 1
F/R-operation
F/R-changeover via I
2 DIR F/R IND. possible F 2
Direction indication for I F/R IND. 2 DIR possible F 3
Switched off
(= 0 Hz / 0V)
OFF any no F 4
Sound velocity
measurement
SOUND.VELO any no F 5
For connection diagrams of outputs, see sect. 2.3.5.
5.8.2 Other functions for F
Fct. 3.4.2 Unit for frequency output F
PULSRATE
Setting pulses per unit of time (see fct. 3.4.3).
PULSE/UNIT Setting pulses per unit of volume (see fct. 3.4.3).
Example of PULSRATE
Full -scale setting:
1,000 Liter per second (set via fct. 3.1.1).
Pulse rate: 1,000 pulses per second (set via fct. 3.4.3).
Pulse value: 1 pulse per Liter.
Changeover of full-scale setting: 2,000 Liter per second (change over via fct. 3.1.1).
Pulse rate: unchanged (see above), 1,000 pulses per second.
Pulse value now: 1 pulse per 2 liter.
Example of PULSE/UNIT
Full-scale setting:
1,000 Liter per second (set via fct, 3,1.1).
Pulse value: 1 pulse per Liter (set via fct. 3.4.3).
at 1000 Liter per second: 1,000 pulses per second
± 1 pulse per Liter.
Changeover of full-scale setting: 2,000 Liter per second (change over via fct. 3.1.1).
Pulse value: unchanged (see above) 1 pulse per Liter.
at 2000 Liter per second: 2,000 pulses per second
± 1 pulse per Liter as before.
Fct. 3.4.3 Pulse rate for 100% flowrate (F
100%
)
(appears only if “PULSRATE” set in fct. 3.2.2).
Range:
2.778
×
10 -3 to 1,000 PuLSe/Sec
0.1667 to 60,000 PuLSe/min
10 to 3,600,000 PuLSe/hr
Setting: Refer to sect. 5.3 “Special settings”!
Fct. 3.4.3 Pulse value
(appears only if “PULSE/UNIT” set in fct. 3.4.2).
Unit: Select from List in section 5.1.
Range: 0.0001 to 9.9999
×
10 9 PuLSe/Unit.
Setting: Refer to sect. 5.3 “Special settings”!
Setting is not checked but: Q
100%
×
pulse value must be less than or equal to 3,600,000 pulses/hr (equivalent to kHz)!
Fct. 3.4.5 Pulse width
Five pulse widths (30 / 50 / 100 / 200 / 500 m Sec) can be selected for programmed output frequencies (F
100%
, fct. 3.4.3)
less than or equal to 10 Hz (note output load and frequency ranges, see table in sect. 2.3.3).
Fixed pulse widths (50% duty cycle) are provided for programmed output frequencies above 10 Hz (see sect. 2.3.3)
regardless of the pulse width (see above) that has been set.
Fct. 3.4.5 Time constant for F
40 mSec
Time constant = 0.04 seconds (best for counting and/or batching processes).
SAME AS I Same time constant as for current output I, see fct. 3.3.6.
(practical if frequency output F is used for instantaneous-value measurement).