H-3531 – Xylem H-3531 FlashLite User Manual
Page 19
H-3531
Installation 2-7
2.6 Wiring and Installation Precautions
!
The data recorder must be earth grounded.
!
The H-3531 FlashLite™ requires that the water be at ground potential. Mother
Nature takes care of this for surface and ground water.
!
Make certain the pressure port connection is tight
!
Make certain the sintered bronze vent port is not painted or covered
2.7 Programming Your SDI-12 Data Recorder
You must prepare your data recorder to receive and record the H-3531 FlashLite™ data. Since
data recorders differ widely, refer to your recorder manufacturer's directions. In general, program
the data recorder to input four values via the SDI-12 port. Usually only one or two of the
parameters are actually recorded. Your data recorder must issue an “aM!” command, then collect
the data with a “aD0" command, as explained in chapter 5. The H-3531 FlashLite™ places four
parameters in its data buffer:
a+AA.AA+BB.BBBB+CC.C+DD.D
Where:
a
= SDI-12 address 0-9, A-Z
AA.AA
= Stage (feet, inches, meters etc.)
BB.BBBB
= Pressure (PSI)
CC.C
= Temperature (C)
DD.D
= Input Supply Voltage (Volts)
2.7.1 Programming the SDI-12 Address
If more than one sensor is to be connected to the SDI-12 bus, make certain each sensor has
a different sensor address. The H-3531 FlashLite™ comes from the factory with its
address set to zero. The address can be edited using the RS-232 menu interface or using
the extended SDI-12 command. Refer to chapter 4 and 5.
2.8 Programming the H-3531 FlashLite™ Sensor
The H-3531 FlashLite™ comes from the factory with the following programmable settings:
SDI Address:
0
2
Slope:
2.3067 (feet of H 0)
Offset :
0.00
MeanCount:
8
Power_Mode:
0 = “Sleep”
0-5V_Hi:
34.6 (feet, 0-15psi)
0-5V_Lo:
0.0
4-20mA_Hi:
34.6 (feet, 0-15psi)
4-20mA_Lo:
0.0