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OTC Transmitters

WIRELESS RESISTIVE LEVEL TRANSMITTER & SENSOR

Battery-Powered Self-Contained Level Sensing Solution

RL1 | RL1-T | RL2 | RL2-T

HIGHLIGHTS

  • Monitor product, interface & temperature using a single Resistive Level Sensor
  • Up to a 10-year battery life
  • 1/2” or 1/4” resolution option
  • ± 1/8” accuracy on 1/4“ sensor / ± 1/4” accuracy on 1/2“ sensor
  • Flex (PTFE) or rigid (316 SS) sensor option
  • “Set it and forget it” one-time calibration
  • Installs in minutes with Quick Connect that eliminates wiring error and hassle
  • Self-contained, rugged design
  • Class I, Division 1 (Zone 0)
  • Intrinsically Safe
  • IP66, -40 °C to 70 °C (Transmitter)
  • -40 °C to 120 °C / -40 °F to 248 °F (Sensor)
  • 900 MHz & 2.4 GHz radio option
  • Secure AES encryption

Accurate Level Sensing Solution

The OleumTech® SM Series Resistive Transmitter and Level Sensor combination is the superlative wireless tank level monitoring solution. The Resistive Level Transmitter provides the ability to monitor product, interface, and temperature levels using a single, high precision Resistive Tank Level Sensor.

OleumTech’s patented Resistive Sensors are offered in both flexible (PTFE) and rigid (316 SS) materials in various custom lengths.

The 1/4” resolution sensors mate with the RL1-T and RL2-T Transmitter versions. The 1/2” resolution sensors mate with the RL1 and RL2 versions.

Get even more functionality out of your Level Transmitter by selecting the discrete inputs version. It is ideal for use with the OleumTech high level switches for spill prevention, and the thief hatch switches to meet EPA methane regulatory requirements. The ultra-low-powered transmitter is powered by a replaceable battery pack that provides up to a 10-year life.

Reliable, Scalable, and Safe

The field-proven wireless level sensor node communicates with an assigned wireless gateway within the OTC Wireless Sensor and I/O Network creating a highly scalable network, accommodating virtually any I/O requirement. OleumTech Wireless Level Transmitters are certified for use in Class I, Division 1 (Zone 0) hazardous locations. It is intrinsically safe, designed not to cause a spark and can be serviced without being removed from a process.

This product is also available with a local display.

This product is also available in a hardwired version.

Applications

The Resistive Level Sensors are ideal for use as oil level sensors, water level sensors for storage tanks that contain either or both liquid densities. These level instruments are widely used in oil production tank batteries, condensate tanks, water treatment centers, petrochemical and chemical-making plants, wastewater handling and storage facilities, refineries, and power generating plants.

TECHNICAL SPECIFICATIONS

WIRELESS COMMUNICATIONS 
Type: 900 MHz / 2.4 GHz∙ ISM Band, Spread Spectrum
∙ 900 MHz: FHSS (Frequency Hopping), FSK, AES Encryption 256-bit (900 MHz), 128-bit (915 MHz)
∙ 2.4 GHz: DSSS (Direct-Sequence), AES Encryption 128-bit
Bit Rate∙ 900 MHz: 9600 bps / 115.2 kbps ; 2.4 GHz: 250 kbps
Output Power∙ 900 MHz: 10 mW; 2.4 GHz: 63 mW
Receiving Sensitivity∙ 900 MHz: -110 dBm @ 9600 bps, -100 dBm @ 115.2 kbps / 2.4 GHz: -100 dBm @ 250 kbps
RF Range∙ 900 MHz: Up to 7500 Feet (2.3 km) with Clear Line of Sight
∙ 2.4 GHz: Up to 7 km / 4.3 miles with Clear Line of Sight
HARDWARE FEATURES 
Device Functionality∙ OTC Wireless Transmitter that Supports Resistive Level Sensors
Model Configuration∙ RL1: 1/2" Resolution; 3-in-1 Monitoring: Product, Interface and Temperature (6-pin Quick Connect)
∙ RL2: 1/2" Resolution, 5-in-1: 2x Discrete Input + Product, Interface and Temperature (6-pin Quick Connect)
∙ RL1-T: 1/4" Resolution; 3-in-1 Monitoring: Product, Interface and Temperature (8-pin Quick Connect)
∙ RL2-T: 1/4" Resolution, 5-in-1: 2x Discrete Input + Product, Interface and Temperature (8-pin Quick Connect)
Embedded Controller∙ Ultra-Low Power RISC Microcontroller with Internal FLASH (Field Upgradeable)
Configuration∙ Standard RS232 Serial / BreeZ® Software for PC (v5.5 or higher for 1/4" Resolution Models)
Resolution∙ Resolution Depends on Sensor Type: 1/4" (6.4 mm) or 1/2" (12.7 mm)
Accuracy∙ 1/4" Resolution Sensor: ±1/8" (2/16") Accuracy; 1/2" Resolution Sensor: ±1/4" Accuracy
∙ 6.4 mm Resolution Sensor: ±3.2 mm Accuracy; 12.7 mm Resolution Sensor: ±6.4 mm Accuracy
Power Source∙ Self-Contained, Internal 3.6 Vdc Lithium Battery
Internal Battery Life∙ Up to 10 Years, Based on User Defined Reporting Intervals
Device Diagnostics∙ Health Tags: Battery Voltage, Received Signal Strength Indication (RSSI), RF Refresh, RF Timeout, Error Codes
MECHANICAL SPECIFICATIONS
Dimensions: LL3, LL3-T∙ 5.5" (W) x 7.9" (H) x 4.4" (D) / 140 mm (W) x 201 mm (H) x 112 mm (D)
Dimensions: LL3-D, LL3-DT∙ 5.5" (W) x 12.9" (H) x 4.4" (D) / 140 mm (W) x 328 mm (H) x 112 mm (D)
Package Dimensions ∙ 10.25" (W) x 14" (H) x 6.5" (D) / 260mm (W) x 356mm (H) x 165mm (D)
Package Weight∙ LL3: ~5.5 lbs / 2.5 kg | LL3-D: 7 lbs / 3.2 kg
Connection Fitting∙ Quick Connect Adapter to Sensor - No Wiring Required
Enclosure Casing Material∙ Type 4X Aluminum; IP66
CERTIFICATIONS & COMPLIANCE 
EMC/EMI∙ FCC Part 15 (USA)
∙ IC ICES-003 (Canada)
Safety∙ Class I, Division 1, Groups A, B, C, D T3C; Ex ia IIC T3
∙ Class I, Zone 0; AEx ia IIC T3 / Ta = -40 to 158 °F (-40 °C to 70 °C)
∙ ATEX: Sira 13ATEX2142X; Ex ia IIC T3 Ga; II 1 G
∙ IECEx: SIR 13.0054X; Ex ia IIC T3 Ga / Ta = -4 to 158 °F (-20 °C to 70 °C)
SENSOR COMPATIBILITY 
1/2" Sensor Kits w/Float(s)1/2" TG-xxx-Fxx (Flex) and ZG-xxx-Fxx (Rigid) Works with RL1, RL2
1/4" Sensor Kits w/Float(s)1/4" TH-xxx-Fxx (Flex) and ZH-xxx-Fxx (Rigid) Works with RL1-T, RL2-T
Flex Sensor Part #Flex 1/2": 60-4101-xxx; Flex 1/4": 60-4102-xxx
Rigid Sensor Part #Rigid 1/2": 60-4001-xxx; Rigid 1/4": 60-4002-xxx
GENERAL SPECIFICATIONS 
Operating Conditions∙ Ambient Temperature (Class I, Division 1): -40 °F to 158 °F (-40 °C to 70 °C)
∙ Ambient Temperature (Non-Hazardous Applications): -40 °F to 176 °F (-40 °C to 80 °C)
∙ Humidity: 0 to 99 %, Non-Condensing
Warranty∙ 2-Year Parts and Labor
Country of Origin∙ USA
SENSOR
RIGID: 316 Stainless Steel "SS"
FLEX: Polytetrafluoroethylene "PTFE"
Type
Extremely Reliable and Accurate Resistive Reed Switch Technology
Measurement Capabilities (3-in-1)
Product, Interface, and Temperature
Lengths Offered in US Units
2 to 21 ft Length in 1 ft Increments
8 to 38 ft Length in 1 ft Increments
Lengths Offered in Metric
0.61 to 6.4 m in 0.31 m increments
2.44 to 11.58 m in 0.31 m increments
Resolution and Accuracy
Option 1: 1/2-inch (12.7 mm) Resolution with ±1/4-inch ( ±6.4 mm) Accuracy (6-pin Quick Connect)
Option 2: 1/4-inch (6.4 mm) Resolution with ±1/8-inch (±3.2 mm) Accuracy (8-pin Quick Connect)
Sensor to Interface Mating Connection (No Wiring Solution)
316 SS Quick Connect: 6-pin Connection for 1/2" Resolution, 8-pin Connection for 1/4" Resolution
Tank Mating Connection (Adjustable Compression Fitting)
3/4" NPT Male
1" NPT Male
Temperature Accuracy
±1 °C
Sensor Rod/Tubing Diameter
0.68" (17 mm): 15 ft Sensor or Shorter
0.85" (22 mm)
0.85" (22 mm): 16 ft Sensor or Taller
Anchor Weight Diameter
N/A
2.4" / 60.3 mm
Height of Anchor Weight
N/A
8 to 19 ft sensor: 5"
20 - 28 ft sensor: 6.75" / 29 - 38 ft sensor: 8"
Coiled Diameter
N/A
20" (50.8 cm) Coiled Diameter
Minimum Measurement from Bottom (Deadband)
2" (50.8 mm) from Bottom
From Top of Anchor Weight
Pressure Rating
Float Dependent
Float Dependent
Sensor Only without Float(s)
569 PSI / 39 Bar
142 PSI / 9.8 Bar
Sensor w/ 316 SS Float - Standard*
440 PSI / 30 Bar
N/A
Sensor w/ 316 SS Float - Large
363 PSI / 25 Bar
142 PSI / 9.8 Bar
Sensor w/ Polypropylene (PP) Float
72 PSI / 5 Bar
72 PSI / 5 Bar
Float Options:
*316 Stainless Steel - Standard, 440 PSI/30 Bar
Compatible Only with Rigid Sensor Length up to 15 ft Prod: 0.64 SG, Intf: 0.96 SG, ID 0.72" (18.3 mm)
OD 2.05" (52.1 mm), Inner Clearance: 0.1" (2.6 mm)
316 Stainless Steel - Large, 363 PSI/25 Bar
Product: 0.62 SG, Interface: 0.95 SG, ID 1.1" (27.9 mm), OD 2.76" (70.1 mm), Inner Clearance: 0.5" (12.7 mm)
Polypropylene (PP), 72 PSI/5 Bar
Product: 0.64 SG, Interface: 0.96 SG, ID 1.1" (27.9 mm), OD 2.91" (73.9 mm), Inner Clearance: 0.5" (12.7 mm)
Operating Temp. Sensing Area
-40 °F to 248 °F (-40 °C to 120 °C)
Certifications
Class I, Division 1, Groups C, D T4; Ex ia IIB T4 Ga; Class I, Zone 0, AEx ia IIB T4 Ga, -40 °C ≤ Tamb ≤ 70 °C
ATEX: Sira 16ATEX2229X; Ex ia IIB T4 Ga, -40 °C ≤ Tamb ≤ 70 °C
IECEx: SIR 16.0079X; Ex ia IIB T4 Ga, -40 °C ≤ Tamb ≤ 70 °C
Power (Wireless)
SX1000-BP3, 3.6 V Lithium Replaceable Battery Pack, 10-Year Life @ 1 min Read Interval
Power (Hardwired)
External 6-12 Vdc (12 V max), 5.4 mA @ 6-12 Vdc
Wireless Compatibility
OTC - WT / SM Series Resistive Transmitters and Sigfox-enabled Resistive Transmitters
Hardwire Serial Interface (H-Series Only)
RS485, 2-Wire, 16 or 32-bit Modbus RTU, LevelMaster ASCII, Termination for Daisy-chain
Minimum Sensor Read Interval
Down to 5 Seconds
Model #: 1/2" Resolution with ±1/4-inch Accuracy
60-4001-xxx
60-4101-xxx
Model #:1/4" Resolution with ±1/8-inch Accuracy
60-4101-xxx
60-4102-xxx
Kit #: 1/2" Resolution with Float(s)
ZG-xxx-Fxx
TG-xxx-Fxx
Kit #: 1/4" Resolution with Float(s)
ZH-xxx-Fxx
TH-xxx-Fxx
ORDERING INFORMATION 
Model Numbers∙ 900 MHz: SM5000-RL1 / SM5000-RL1-T / SM5000-RL2 / SM5000-RL2-T
∙ 2.4 GHz: SM5400-RL1 / SM5400-RL1-T / SM5400-RL2 / SM5400-RL2-T
Wirelessly Connects To∙ OTC Wireless Gateway
Configuration Cable∙ SX1000-CC2, 20-ft All-in-One Configuration Cable
Replacement Battery∙ Use OleumTech SX1000-BP3 Only