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  • Optimal process safety
  • Reliable measurement even in tanks with agitated surfaces, foam or deposits on the probe
  • Easy navigation via touch screen
  • Easy to install: onsite calibration is not needed
  • Operates up to 300 bar / 4350 psi
  • Measures down to dielectric constant of 1.1
  • PACTware and DTMs included as standard
  • Optional FOUNDATION Fieldbus and PROFIBUS PA outputs
  • Optional second current output
  • High-pressure and high-temperature versions
  • Optimal process safety (with Metaglas dual process sealing system for dangerous products)
  • Display in 9 languages
  • Available in stainless steel and Hastelloy C-22 (other materials are available on request)
  • Angled single cable and rod probes are available on request for installation in tanks which contain obstructions

The Krohne OPTIFLEX 1300 C level meter is a universal device that measures distance, level, interface, level and interface, volume and mass of liquids, pastes, granulates, powders, and liquid interface. The OPTIFLEX 1300C offers highly accurate measurements to 35 meters (115 feet) making it ideal for uses in blending tanks, distillation tanks, separators and storage silos across a wide range of industries.

The Krohne OPTIFLEX 1300C level meter utilizes proven Time Domain Reflectometry (TDR) technology which transmits low-intensity electromagnetic pulses along a rigid or flexible conductor. The time from when the pulse is transmitted to when it is received is equivalent to the distance from the reference point of the device (the flange facing) to the surface of the product. The time value is then converted into an output current of 4-20 mA and/or a digital signal.

The 1300C has higher signal dynamics and a sharper pulse than conventional TDR devices and therefore better reproducibility and accuracy. Dust, foam, vapor, agitated surfaces, boiling surfaces, changes in pressure, changes in temperature and changes in density do not have an effect on device performance. The 1300C can also operate at very low and very high process temperatures as long as the process connection temperature limits are observed.

The Krohne OPTIFLEX 1300C level meter is available in meter or remote mount versions. A wide range of probes, materials, process connections, electrical connections and agency approvals are available. The device is simple to set-up and navigation is straightforward via the touch screen display.

Krohne OPTIFLEX 1300C Level Meter Specifications:
Function Time Domain Reflectometry (TDR )
Parameters Level, distance, volume and interface
Media Liquids, pastes, slurries, powders and granulates
Primary Measured Value Time between the emitted and received signal
Maximum Measuring Range Double rod Ø8 mm: 4 m (13 ft)
Single rod Ø8 mm: 4 m (13 ft)
Coaxial Ø22 mm: 6 m (20 ft)
Double cable Ø4 mm: 8 m (26 ft)
Single cable Ø2 mm: 35 m (115 ft); liquids only
Single cable Ø4 mm: 35 m (115 ft ); liquids only
Single cable Ø8 mm: 35 m (115 ft )
Output Signal (Output 1) 4-20 mA HART or 3.8-20.5 mA acc. to NAMUR NE 43
Output Signal (Output 2) 4-20 mA or 3.8-20.5 mA acc. to NAMUR NE 43 (optional)
Resolution ±3 μA
Temperature Drift Typically 50 ppm/K
Error Signal High: 22 mA; Low: 3.6 mA acc. to NAMUR NE 43
Maximum Load 350 Ohms (at 20.5 mA with 17 VDC supply voltage)
Repeatability ±1 mm (±0.04¨)
Resolution ±1 mm (±0.04¨)
Accuracy in Direct Mode Liquids: ±3 mm, for distances < 10 m (33 ft)
Liquids: ±0.03%, for distances > 10 m (33 ft)
Powders: ±20 mm
Interface: ±10 mm
Accuracy in TBF Mode ±20 mm
Minimum Layer (Interface) 50 mm
Process Conditions
Ambient Temperature -40 to 80°C (-40 to 175°F)
Flange Temperature -40 to 200°C (-40 to 390°F)
Thermal Shock Resistance 100°C/minimum
Operating Pressure -1 to 40 bar (-14.5 to 580 psig); subject to process connection
Vibration Resistance IEC 68-2-6 and EN 50178 (10-57 Hz: 0.075 mm / 57-150 Hz:1g)
Protection Category IP 66/67 equivalent to NEMA 6-6X
Display 9 line LCD, 160 x 160 pixels in 8-step grayscale with 4-button keypad
Approvals ATEX, FM, CSA (others upon request)
Process Connections Thread and flange connections in both standard and metric sizes available

Application Notes

Here's how some of our customers used this product.

Measuring Level in Environments with High Temperatures and Pressures

The Background: The customer, a nuclear energy company, needed to measure the level of water in a vessel which was pressurized to 1200 psi @ 580°F, and had an existing 1" npt fitting.

The Problem: The high temperatures and pressure of this application presented significant challenges. While some level meters are compatible with high temperature and others with high pressures, it is rare to find one that is compatible with both.

The Solution: The Krohne 1300C uses proven Time Domain Reflectometry (TDR) technology and features rugged stainless steel construction making it an excellent choice for applications involving high heat and pressure. The 1300C is highly configurable making it easy to customize to nearly any application.