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ULTRAFLOW® 54 DN15-125
Kamstrup A/S · Technical description · 5512-2464_D1_GB_09.2021
79
8.5
Pulse Tester
During a calibration process, it is often practical to use Pulse Tester type no. 6699-279, which has the following functions:
Galvanically separated pulse outputs
Integral supply for ULTRAFLOW
LCD display with counter
Externally controlled ”Hold” functi
on
Can be fitted directly on a MULTICAL® base unit (type 66- and 602-)
8.5.1
Technical data for Pulse Tester
Pulse inputs (M1/M2)
Counter inputs
Max frequency: 128 Hz
Active signal
Amplitude: 2.5 - 5 Vpp
Pulse duration
1 ms
Passive signal
Internal pull-
up 680 kΩ
Internal supply
3.65 V lithium battery
<
Depending on the connecting base used, there will be one or two pulse inputs/outputs.
Figure 62
1
Flow sensor with transistor output
The transmitter is normally an optocoupler with FET or transistor output to be connected to terminals 10 and 11
for flow sensor M1 and terminals 69 and 11 for flow sensor M2.
The leak current of the transistor must not exceed 1 µA in OFF-state, and U
CE
in ON-state must not exceed 0.5
VDC.
2
Flow sensor with relay or reed switch output
The transmitter is a reed switch, which is normally mounted on vane wheel and Woltmann meters, or relay output
from e.g. MID meters. This type of transmitter should not be used as the quick pulse input may cause bounce
problems.