Lightning Audio 7532 manual Auxiliary energy, Performance characteristics, According to OIML R85

Technical dataRadar Tank Gauge

	Auxiliary energy
Electrical connection	Housing T 12 with separate terminal compartment.
Load HART	Minimum load for HART communication: 250 Ω
Cable entry	Cable gland: M20x1.5 or Pg13.5
	Cable entry: G ½ or ½ NPT
Supply voltage	See page 28
Power consumption	Max. 330 mW at 16 V, max. 500 mW at 24 V, max. 600 mW at 30 V.
Current consumption	Max. 21 mA (50 mA inrush current).
Power supply	For stand alone operation recommended via e.g. Varec RN 221N/Z.

	Performance characteristics
Reference operating	According to OIML R85:
conditions	• Temperature = –25…+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.
	Note!
	No major interference reflections inside the signal beam.
Maximum measured	Absolute accuracy: 0.5 mm (2σ value)
error	Inventory Control Versios: ±3 mm
Proof of accuracy for	The accuracy of each 7500 RTG is established through a calibration
custody transfer ver-	certificate that records the absolute and relative error at 10
sions	equidistant points during the final test. For stilling well measurements
	with 7532 RTG, a NMI / PTB calibrated tape with an absolute accuracy
	of 0.25 mm is used.
	Each 7500 RTG is delivered with the PTB and NMi type approval.
	Additional initial factory verifications for custody applications are
	available on demand for all 7500 RTG.
Maximum fill speed	By the first pass trough of measuring range: 100 mm/min., after it
	unlimited.
Non-repeatability	0,3 mm (1/64")
Hysteresis	0.3 mm
Resolution	digital: 0.1 mm
	analogue: 0.03 % of measuring range
Settling time	Typical 15 sec
Long-term drift	The long-term drift is within the specified accuracy.
Influence of ambient	Within the specified accuracy according to OIML R85.
temperature
Software reliability	The software used in the 7500 RTG fulfills the requirements of OIML
	R85. This particularly includes:
	• cyclical test of data consistency
	• non-volatile memory
	• segmented data storage
	The 7500 RTG continuously monitor the compliance with accuracy
	requirements for custody transfer measurements according to OIML
	R85. If the accuracy cannot be maintained, a specific alarm is
	generated on the local display and via the digital communication.

88 Installation and Operations Manual