Engineering Specifications – Sitrans Probe LR
2-wire Radar Level Transmitter
GENERAL
Scope
This section describes the requirements for a 2-wire Radar level measuring system. Under this
item, the contractor shall furnish and install the level measuring system, and all associated
equipment and accessories as indicated on the plans and as herein specified.
Submissions
The following information shall be included in the submittal for this section:
 Data sheets and catalog literature for system components.
 Interconnection and dimensional drawings.
Basic System Description
The microprocessor based high performance loop powered 2-wire Radar level transmitter shall
employ microwave pulse ranging technology operating on 6.3 GHz to determine the distance to
the monitored surface(s), as a basis for display, output, and digital communication. The unit
should be configurable using remote and local interface.
Level System Component Descriptions
The level system shall consist of a transmitter/receiver, a rod antenna and a signal processor for
continuous measurement of material levels of liquids and slurries in open or closed tanks or in
stilling wells or in standpipes, without contacting the medium.
The radar level transmitter shall:

Measure level, distance, space, and volume of the medium in the vessel

Apply 11-point linearization to ensure accurate measurement in non-standard vessels.

Be 2-wire loop powered.

Create a digitized echo profile, and apply patented Sonic Intelligence echo- processing
techniques to select and verify the echo representing the reflective surface monitored.

Process signal using advanced echo-processing techniques such as Auto False- Echo
Suppression, and Agitator discrimination for maximum verification of the measurement,
display and outputs.

Be NEMA 4x and FM approved for Class I Division 1 areas Groups A,B,C,D with
Intrinsically Safe Barrier.

Have a Polybutylene Terephthalate enclosure with a Polyether Imide lid.

Have a single material for rod antenna and integrated threaded connection

Compact electronics mounted in a rotating head.

Provide user interface via local multi-graphic display with bar graph for readout & entry,
and via analog current output.

Communicate digitally by HART as a built-in standard.

Be commissioned without opening the lid, using intrinsically safe Infrared hand held
programmer locally, or remotely using HART hand held unit or Simatic PDM software
package.
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Product Specification
RADAR LEVEL TRANSMITTER – ROD / HORN ANTENNA
Service
Service:
Fluid:
Operating Pressure:
Process Temperature:
Humidity:
Installation Drawing:
Application:
As noted
As noted, turbulent surface
As noted
minus 40 to 80oC (minus 4°F to 176°F)
10 to 90%
As noted
Level and volume monitoring in Closed tanks / Open Wet wells
Performance
Range:
Accuracy:
Repeatability:
Fail-safe:
Sensor
Measuring Principle:
Frequency:
0.3 to 20 m (1.3 to 65’)
+/- 10 mm or +/- 0.1% of the range, whichever is greater
+/- 5 mm
mA and “reading” programmable high, low or hold, or user selectable
upon Loss of Echo (LOE) condition
Pulse-based microwave
6.3 GHz
Closed Tank
Type:
Mounting:
Pressure Rating:
Antenna:
Blanking:
Single construction Rod Antenna with integrated threads hermetically
sealed
1 ½”
Maximum 3 bar at 80oC (43.5 psig at 176°F)
di-electric rod with integral threads in Polypropylene
0.3 M
Open Wet wells / tanks
Type:
Mounting:
Pressure Rating:
Antenna:
Blanking:
Single construction Rod Antenna with integrated threads hermetically
sealed
1 ½”
Maximum 3 bar at 80oC (43.5 psig at 176°F)
di-electric rod with integral threads in Polypropylene
0.3 M
Transmitter
Power supply:
Enclosure:
Ingress protection:
Ambient Temp:
Display:
mA O/P:
Communication:
Loop powered with 24 VDC at maximum 550 Ohms
Polybutylene Terephthalate enclosure and Polyether Imide lid with 2 x ½”
NPT cable entries
NEMA 4X or IP 67
-40°C to 80°C (-40°F to 176°F)
Alpha numeric and Multi-graphic LCD display with bar graph (for level)
4 – 20 mA into 550 Ohms maximum at 24 Vdc
Built-in HART
Infrared hand programmer link
HART hand held unit and/or SIMATIC process device manager (PDM)
software package
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Approvals:
Radio approval FCC
Intrinsically Safe with approved barrier
Additional Equipment
The following additional equipment shall be available at additional cost.
 Infrared hand programmer for local instrument access and configuration.
 HART hand held unit or software package SIMATC process device manager (PDM) for
instrument access and configuration using PC.
Manufacturer: Siemens – Milltronics

The local factory trained representative of the selected equipment shall have a website
containing manuals for the equipment being supplied, training videos covering key
features and basic configuration of the instrument, and list frequently asked questions
with troubleshooting guidelines. This website shall list local contacts with name, address,
telephone number and e-mail addresses.
Installation:
All equipment shall be installed, configured, interconnected, and commissioned by qualified
persons, in accordance with the manufacturer’s instructions and guidelines, and in compliance
with all governing regulations and accepted engineering practices.
Warranty:
The manufacturer shall warrant the equipment described herein, to be free of defects in materials
and workmanship, for a period of thirty (30) months from the date of shipment from the supplier,
or twenty four (24) months from the date of initial equipment start up, whichever is earlier. The
manufacturers liability shall be limited to the repair or replacement of the materials supplied, free
of charge F.O.B. the manufacturer’s facility. Alternatively, at its option, the manufacturer may
elect to refund the purchase price. Other limitations may apply. Refer to the “Terms and
Conditions of Quotation or Sale”, provided by the equipment manufacturer for complete warranty
details.
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