Xylem 795 MJK Data Transmitter - Manual (Page 27)

27 M795GB0503
Data Transmitter 795
SW ver. 830434
14 Programming of stormflow calculation
14.1 Stormflow calculation
Data Transmitter 795 can calculate the flow of an
overrun via a digital input an an analogue input.
In above example, MJK Pressure Transmitter
7062 provides the level signal to the Data Trans-
mitter, and an MJK Level Electrode 501 is
mounted where the stormflow starts. By this, the
level measurement is set to zero and flow is
calculated by means of the level signal.
Usually, the Data Transmitter is connected to a
Pump Controller 704 with a level transmitter with
its measuring range adopted to the pump
controller. The measuring range is normally higher
than necessary for flow measurement, typically
10 m for the pump control and 10-20 cm for flow
calculation. The accuracy on the level
measurement of the pump controller is as the to-
tal measuring range of the flow measurement.
The Q/h curve of the weir must be entered in this
menu such as the data transmitter can calculate
the stormflow. Include as many Q(h) points as
possible in order to obtain the highest possible
calculation accuracy.
Below is demonstrated Q(h) curve and Q(h) table
for a rectangular weir with side contraction:
Q(h) point no.: h[m] Q[m 3 ]
1 0,00 0,00
2 0,01 48,71
3 0,02 137,78
4 0,03 253,12
5 0,04 389,70
6 0,05 544,62
7 0,06 715,92
8 0,07 902,17
MJK 7062
MJK 501
MJK 795
13.2.3 Enter SMS message
If the current telephone number type is selected
as an SMS type, enter an SMS message/code of
up to 8 digits:
Use the numerical keys and confirm with ENTER.
If the message is entered via the keypad of the
Data Transmitter, the message can only consist
of numbers, but with MJK-Link™ it will be
possible to enter text messages.
The SMS message will be displayed on the cell
phone with 'MJK 795' as headline followed by
location and cause of the alarm and the SMS
message.
Test the SIM card in a cell phone if the SMS
messages are not received. Also, check if the
telephone number to the receiving SMS gateway
is correct.
Pager messages and SMS messages are
delivered as telegraphic alarm to an external ser-
ver, which implies that Data Transmitter 795 has
no option to test that the telegraphic alarm has
been received by the recipient.
13.2.4 Pause between calls
Enter a pause between the call attempts to the
telephone numbers on the telephone list:
Use the numerical keys and confirm with ENTER.