SITRANS LR120

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SITRANS LR120 is a W-band FMCW radar sensor for level measurement of liquids and solids up to 30 m. Its compact, robust design supports Bluetooth, HART, and Modbus RTU, ensuring reliable performance in harsh environments.

Zalo Hotline: 0961.67.69.69

Description
Specifications

Key Features

Bluetooth-enabled configuration using the SITRANS mobile IQ app on smartphones
Fully encapsulated PVDF housing, resistant to chemicals and corrosive environments
Supports HART 7.0 or 4-wire Modbus RTU for flexible system integration
W-band FMCW radar with a narrow beam and compact antenna—ideal for space-limited or obstructed environments
Outdoor installation approved, no need for sealed or pressurized tanks
High accuracy up to ±2 mm, with zero near range for precise inventory control
Optional Submergence Shield accessory protects the sensor from submersion and prevents buildup of sludge or debris
Hazardous area versions available for use in explosive gas or dust atmospheres

Typical Applications

Pump wells with internal obstructions or narrow structures
Level measurement of solid materials such as sand, gravel, or plastic pellets
High-precision level monitoring of liquids or sludge in long-range applications
Outdoor and flood-prone environments, or areas with chemical exposure

Category	Specification
Mode of operation
Measuring principle	W band FMCW radar
Measuring range	0 … 30 m (0 … 98.4 ft)
Frequency	80 GHz nominal
Beam angle	4°

Power Supply
HART
• Voltage	12 … 35 V DC
• Current	4 … 20 mA
Modbus
• Voltage	8 … 30 V DC
• Current	38 mA at 8 V DC / 17 mA at 30 V DC

Communications
4 … 20 mA	HART 7.0
Modbus (4-wire option)	RTU

Accuracy	± 2 mm (range 0.25 … 30 m) ± 10 mm (range 0 … 0.25 m)

Rated operating conditions
Vessel pressure	-1 … +3 bar (14.50 … 43.51 psi g)
Ambient temperature	-40 … +80 °C (-40 … +176 °F)
Process temperature	-40 … +80 °C (-40 … +176 °F)
Storage temperature	-40 … +80 °C (-40 … +176 °F)

Design
Weight	0.7 kg (1.5 lb), plus 0.1 kg/m (0.2 lb/ft) cable length
Material
• Enclosure	PVDF
• Submergence shield	Polypropylene
• O-ring	Silicone
Degree of protection	IP66/IP68
Cable connection	1″ NPT or 1″ BSPT threaded connection
• HART version	Length options: 5 … 100 m (16.4 … 328.1 ft), 2 conductor, twisted with shield 18 AWG, PVC jacket
• Modbus version	Length options: 5 … 100 m (16.4 … 328.1 ft), 4 conductor, twisted pairs, 22 AWG, polyurethane jacket

Certificates and approvals
General	CE, _CFM_US, _CCSA_US, ATEX, IECEx, EACEx, CSA-Japan-Ex, RCM, INMETRO, NEPSI, CCOE, PESO, FDA/(EG)1935/2004
Radio	CE, FCC, IC, Anatel, ICASA, NCC, KC, CITC, RCM, WPC, Telec, NBTC, MCMC
Marine	ABS, CCS, DNV-GL, LR, NK, RINA
Canadian Registration Number (CRN)	• British Columbia 0F22218.51 • Alberta 0F20596.2 • Saskatchewan 0F2002.3 • Manitoba 0F7032.4 • Ontario 0F22218.5 • Quebec 0F05183.6 • New Brunswick 0F1490.07 • Nova Scotia 0F1490.08 • Prince Edward Island 0F1490.09 • Newfoundland and Labrador 0F1490.0 • Yukon 0F1490.0Y • Northwest Territories 0F1490.0T • Nunavut 0F1490.0N

Programming
SITRANS mobile IQ app	SITRANS mobile IQ is a Bluetooth app that provides an intuitive interface to quickly configure, set up and monitor SITRANS LR100 series. More info: siemens.com/mobileIQ
SIMATIC PDM	SIMATIC PDM allows for remote PC configuration and diagnostics (for installation on a network).
SITRANS DTM	–

SITRANS LR120

Key Features

Typical Applications

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