GWR-2000 Four-wire 4-20 mA/HART
925-0335 Rev B
3 Production description
8
This operating instructions manual applies to the following instrument versions:
●
Hardware version from 1.0.0
●
Software version from 1.2.0
●
Only for instrument versions without SIL qualification
The instrument and the electronics version can be determined via the product code on the type
label as well as on the electronics.
●
Standard electronics with operating voltage 90 … 253 V AC; 50/60 Hz: Typ FX80B.-
●
Standard electronics with supply voltage 9.6 … 48 V DC; 20 … 42 V AC: Type FX80I.-
The scope of delivery encompasses:
●
Sensor
●
Documentation
- Quick setup guide
-
Test certificate measuring accuracy (optional)
- Supplementary instructions "
GSM/GPRS radio module
" (optional)
- Supplementary instructions manual "
Heating for display and adjustment module
" (op-
tional)
- Supplementary instructions manual "
Plug connector for continuously measuring sensors
"
(optional)
-
Ex-specific "
Safety instructions
" (with Ex versions)
-
If necessary, further certificates
Information:
In this operating instructions manual, the optional instrument features are described. The re-
spective scope of delivery results from the order specification.
3.2 Principle of operation
The GWR-2000 is a level sensor with cable or rod probe for continuous level measurement,
suitable for applications in bulk solids.
High frequency microwave pulses are guided along a steel cable or a rod. Upon reaching the
product surface, the microwave pulses are reflected. The running time is evaluated by the in
-
strument and outputted as level.
Probe end tracking
To increase sensitivity, the probe is equipped with probe end tracking. In bulk solids with a low
dielectric constant, this function is very helpful. This is the case, for example, in plastic granules,
packing chips or in vessels with fluidized products.
Between a dielectric constant of 1.5 and 3, the function switches on, if required. As soon as the
level echo can no longer be detected, probe end tracking is automatically activated. The mea-
surement is continued with the last calculated dielectric constant.
The accuracy thus depends on the stability of the dielectric constant.
