11
MEASUREMENT SPECIFICATIONS
reference condition: dielectric constant [
İ
r
]=80,
water surface, tank Ø1m, DN200 metal flange
13
Accuracy
±3 mm
Repeatability
<2 mm
Resolution
<1 mm
Probe type
single rod Ø6 mm
coaxial Ø17,2 mm (standard tube: NPS
Ǫ
", 10S)
rope probe Ø4 mm or Ø6 mm
Probe length [L]
single rod probe: 100...3.000 mm
longer length on request
coaxial probe: 100…6.000 mm
rope probe: 1.000...20.000 mm
can be ordered in 1mm increments
the reference point is always the sealing surface of the connection thread (see
dimensional drawings)
Inactive area top [I1]
single rod probe,
İ
r
=80: 50 mm
single rod probe,
İ
r
=2: 80 mm
coaxial probe,
İ
r
=80: 30 mm
coaxial probe,
İ
r
=2: 50 mm
rope probe,
İ
r
=80: 80 mm
rope probe,
İ
r
=2: 80 mm
Inactive areas bottom [I2]
single rod probe,
İ
r
=80: 10 mm
single rod probe,
İ
r
=2: 50 mm
coaxial probe,
İ
r
=80: 10 mm
coaxial probe,
İ
r
=2: 50 mm
rope probe,
İ
r
=80: 20 mm
rope probe,
İ
r
=2: 80 mm
Measuring range [M]
probe length [L] less both inactive areas at top and bottom [I1 and I2]
in this range LTDR will have the specified measurement performance. It is
recommended that the maximum and minimum liquid levels to be measured in
the tank are actually within the measuring range [M] of the sensor (see figure
10)
Switching point [S]
freely positionable within the measuring range [M]
hysteresis can be set by defining separate upper and lower thresholds; if those
are set at the same position, the minimum hysteresis of 3 mm applies
12
MECHANICAL SPECIFICATIONS
Material exposed to
tank atmosphere
single rod probe and rope probe: 1.4404 / 316L and PEEK
coaxial probe: 1.4404 / 316L, PEEK and o-ring seal: EPDM or FKM (Viton)
other o-ring materials on request
gasket at connection thread G3/4A: Klingersil C-4400, 2mm thick
Housing materials
housing body and cover: painted aluminium alloy (epoxy coated in the ATEX
version). Other materials on request
cover o-ring seal: NBR or silicone rubber. Other o-ring materials on request
Housing rating
IP68 10 m H
2
O, NEMA6P
device cover has to be properly tightened and IP68 screw plugs and cable
glands have to be properly mounted (with sealing) and have to be properly
tightened around cable of suitable type and diameter
Cable entries
2 cable entries M16x1.5
ATEX version: 2 cable entries M20x1.5
other dimensions on request
Connection thread [CT]
G¾A (wrench size 32mm)
other connection threads on request
Weight
housing, assembled with electronics and feedthrough: 1240 g
housing (empty): 940 g
ATEX housing, assembled with electronics and feedthrough: 950 g
ATEX housing (empty): 650 g
electronics: 70 g
feedthrough: 220 g
single rod probe, 1m: 230 g
complete coaxial probe, 1m: 770 g coaxial tube (not assembled), 1m: 540 g
set of parts for attaching coaxial tube: 130 g
