Xylem H-3553 - Manual (Page 23)

Setup & Operation
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‘B’ key to enter the “Bubbler Settings” menu and then press the ‘P’ key, then enter in the desired purge
pressure and press the ‘Enter’ key.
To change the H-3553 purge pressure using the SDI-12 interface, send the “aXWPPnn!” SDI-12 extended
command. The response should be “a0061”, which means that it could take 6 seconds to complete the
command and then it will put 1 data value in the buffer. To check the new purge pressure, send “aXRPP!”
command and wait the responded time. Send the “aD0!” command to read back the new written purge
pressure. Note Table 4-15, the ‘a’ is the current SDI-12 address of the H-3553 and the ‘xx’ is the current purge
pressure of the H-3553 and the ‘nn’ is the desired purge pressure.
H-3553 Combo Bubbler setup menu sDI-12 Interface
B – Bubbler Settings Command: aXWPPnn!
: Response: a0061
Bubbler settings menu Command: aXRPP!
P – Purge Pressure: xx Response: a0021
Enter Purge Pressure (15 - 90) [ nn ] Command: aD0!
Response: a + nn
Table 4-15: Change the H-3553 Purge Pressure
Purge Sustain
The purge sustain is part of the purge sequence discussed earlier, it is the time in seconds that the compressor
will keep running after the tank pressure is released into the orifice line. The purge sustain helps clear out
heavier sediment buildup and or bigger blocks at the end of the orifice because of sustaining a higher
pressure.
The H-3553 purge sustain default time is set to 20 seconds. The programmable purge sustain range is 10
to 40 seconds. To change the purge sustain time using the RS-232 main menu, press the ‘B’ key to enter the
“Bubbler Settings” menu and then press the ‘S’ key, enter in the desired “Purge Sustain” time and then press
the ‘Enter’ key.
To change the H-3553 purge sustain using the SDI-12 interface; send the “aXWPSnn!” SDI-12 extended
command. The response should be “a0061”, which means that it could take 6 seconds to complete the
command and then it will put 1 data value in the buffer. To check the new purge sustain time, send “aXRPS!”
command and wait the responded time. Send the “aD0!” command to read back the new written purge
sustain time. Note Table 4-16, the ‘a’ is the current SDI-12 address of the H-3553 and the ‘xx’ is the current
purge sustain time of the H-3553 and the ‘nn’ is the desired purge sustain time.