Technical information

Technical Information 3
Radar Tank Gauge
point due to the hydrostatic tank deformation can be
compensated in the Tank Side Monitor. A Tank Side
Monitor can provide 24 VDC for a 7500 Series Radar
Tank Gauge. The Tank Side Monitor can communicate
with up to 6 devices via HART Multidrop.
Reference Operating Conditions
According to OIML R85:
• Temperature = -25 °C... +55 °C (-13…+131 °F)
• Atmospheric pressure
• Relative humidity (air) = 65 % ±15%
• Medium properties: e.g. medium with good
reflectivity and calm surface.
• Tank diameter: signal beam hits the tank wall only at
one side.
• No major interference reflections inside the signal
beam.
Proof of Accuracy of Custody Transfer Versions
The accuracy of each 7500 Series Radar Tank Gauge is
established through a calibration certificate that
records the absolute and relative error at 10 equidistant
points during the final test. A Laser Interferometer
(Jenaer Messtechnik ZLM 500) with an absolute accuracy
of 0.1 mm is used as a reference for the free space
measurements with 7530 RTG, 7531 RTG and 7533
RTG.
For stilling well measurements with 7532 RTG, a NMI /
PTB calibrated tape with an absolute accuracy of 0.25
mm is used. Each 7500 Series Radar Tank Gauge is
delivered with the PTB and NMi type approval.
Additional initial factory verifications for custody
applications are available on demand for radar
instrument 7500 Series Radar Tank Gauge.
Inventory Control Versions
All device types can be delivered as "Inventory Conctrol
Versions" with a reduced accuracy of ± 3 mm (under
reference conditions).
To these versions, the calibration certificate or custody
transfer type approval is NOT attached. The "Inventory
Control Versions" can be selected by choosing the
option »R« in the order code section »Custody transfer
approvals«
Example System Diagram
Pressure
HART
4-wire
Supply voltage:
16…253 VAC
FuelsManager
Software
8130 RTU
or
8300 TGI
+24V
+5V
+15V
-15V
CPU
COMM
I/O
ERROR
Level
Temperature