User guide

70
11 Supplement
MINITRAC 31 • Foundation Fieldbus
41782-EN-131119
11 Supplement
11.1 Technical data
General data
316L corresponds to 1.4404 or 1.4435
Materials,non-wettedparts
Ʋ Scintillation material NaI (sodium iodide)
Ʋ Aluminium die-casting housing Aluminiumdie-castingAlSi10Mg,powder-coated-basis:
Polyester
Ʋ Stainless steel housing 316L
Ʋ Sealbetweenhousingandhousing
cover
NBR (stainless steel housing, investment casting),
silicone (Aluminium housing)
Ʋ Inspectionwindowinhousingcover
(optional)
Polycarbonate
Ʋ Ground terminal 316L
Processttings
Ʋ Fastening lugs ø 9 mm (0.35 in), hole centre distance 119 mm (4.69 in)
Weight
Ʋ Aluminiumhousing,withelectronics 4.1 kg (9 lbs)
Ʋ Stainlesssteelhousing,withelectron-
ics
9.1 kg (20.1 lbs)
Max.torque,mountingscrews-fastening
lugs on the sensor housing
50 Nm (36.88 lbf ft)
Max.torqueforNPTcableglandsandConduittubes
Ʋ Aluminium/Stainless steel housing 50 Nm (36.88 lbf ft)
Input variable
Measured variable The measured variable is the intensity of the gamma ra-
diation of an isotope. If the radiation intensity decreases,
e.g. due to increasing product density, the measured
value of MINITRAC 31 changes in proportion to the
density.
Analogue input
Ʋ Input type 4 … 20 mA, passive
Ʋ Internal load 250Ω
Switchinginput
Ʋ Type of input - Open Collector 10 mA
Ʋ Type of input - Relay contact 100 mA
Output variable - Level measurement
Output
Ʋ Signal digital output signal, Foundation Fieldbus protocol
Ʋ Physical layer according to IEC 61158-2
Damping (63 % of the input variable) 0 … 999 s, adjustable