BURKERT 574562 is a sanitary-variant Type 8189 guided microwave level transmitter equipped with a 2000 mm stainless steel rod probe and an ISO 2852 Clamp DN 40 process connection. Designed for continuous liquid level measurement, the instrument operates on time domain reflectometry (TDR) principles, sending high-frequency microwave pulses along an 8 mm diameter rod. The physical measurement is independent of steam generation, vessel pressure variations, liquid density fluctuations, condensation, and medium buildup on the probe or vessel walls.

Built specifically for hygienic processing in food, beverage, and pharmaceutical facilities, article 574562 features a wetted 316L (1.4435) stainless steel rod polished to Ra ≤ 0.76 µm with low delta ferrite content. The process seal is executed in food-quality EPDM, compliant with FDA Code of Federal Regulations requirements, and accompanied by an EN 10204 3.1 manufacturer inspection certificate. A local full dot-matrix LCD display and configuration module is included directly inside the PBT housing beneath a transparent polycarbonate cover.

Technical Specifications

Specification Parameter	Value
Article Number	574562
Device Type	Type 8189
Operating Principle	Guided microwave (TDR)
Probe Configuration	Interchangeable rod Ø 8 mm
Probe Length	2000 mm (2.0 m)
Lateral Load Capacity	10 Nm
Surface Roughness	Ra ≤ 0.76 µm
Process Connection	Clamp DN 40 (ISO 2852, collar Ø 50.5 mm)
Operating Voltage ($U_n$)	16...35 V DC (with display/configuration module)
Analogue Output	4...20 mA / HART (2-wire), range 3.8...20.5 mA
Signal Resolution	0.3 µA
Fault Signal Current	Adjustable: last valid value, ≥ 21 mA, or ≤ 3.6 mA
Measurement Deviation	±2 mm (DIN EN 60770-1)
Repeatability	≤ ±1 mm
Step Response Time	≤ 3 s (IEC 61298-2)
Measuring Cycle Time	< 500 ms
Process Pressure	-1...16 bar (-100...1600 kPa)
Process Temperature	-20...+130 °C (sterilisation up to +150 °C for max. 120 min)
Ambient Operating Temperature	-40...+80 °C
Ingress Protection	IP66 / IP67 (IEC/EN 60529)
Dielectric Constant	εr ≥ 1.6

Dimensions and Process Connection

Article 574562 is equipped with an ISO 2852 Clamp connection. The pipe standard specification defines an outer diameter of 38.6 mm, an inner diameter of 35.6 mm, a wall thickness of 1.5 mm, and a clamp flange collar diameter (Ø W) of 50.5 mm.

Clamp Connection Size	Collar Diameter Ø W (mm)	Probe Length L (m)
1", 1 ½" (including ISO 2852 DN 40)	50.5	0.3...4 m (2.0 m for 574562)
2"	64.0	0.3...4 m
2 ½"	77.5	0.3...4 m
3"	91.0	0.3...4 m

Material Composition

Component Part	Material Designation
Rod probe (wetted)	Stainless steel 316L (1.4435), polished Ra ≤ 0.76 µm
Process fitting (wetted)	Stainless steel 316L (1.4435) / PEEK
Process seal (wetted)	EPDM (food quality, FDA compliant)
Housing body	PBT (Polyester) and stainless steel 316L (1.4404)
Housing cover	Polycarbonate (PC transparent)
Housing cover seal	EPDM
Cable gland / Blind plug	Polyamide (PA) / NBR seal
Ground terminal and screw	Stainless steel 316L

Measuring Range and Dead Bands

The reference plane for measurement is the sealing surface of the clamp connection collar. Dead bands (blocking distances) exist directly beneath the reference plane and at the lower probe tip where reflection evaluation is restricted.

Diagram Reference	Functional Zone	Behavior in Water	Behavior in Oil
1	Reference plane	Process seal surface	Process seal surface
2	Probe length	2000 mm (for 574562)	2000 mm (for 574562)
3	Active measuring range	0.08...2.0 m	0.15...1.90 m
4	Upper blocking distance	80 mm (0.08 m)	150 mm (0.15 m)
5	Lower blocking distance	0 mm (0.0 m)	100 mm (0.10 m)

Blocking Distance Optimization

The upper blocking distance represents the minimum distance between the product surface and the reference plane. Measurements cannot be made within this zone. Activating false signal suppression in the setup menu optimizes blocking boundary transitions.

Temperature Derating and Operating Limits

Permissible ambient operating temperatures depend directly on the process medium temperature inside the tank. Article 574562 maintains full specification up to +80 °C ambient temperature across standard process conditions.

• Standard continuous process temperature: -20...+130 °C
• Sterilisation cycle limit: Up to +150 °C for a maximum duration of 120 minutes
• Ambient temperature range: -40...+80 °C with display module installed
• Vessel operating pressure: -1...16 bar (-100...1600 kPa / -14.5...232 PSI)

Installation and Vessel Mounting

Proper probe clearance from vessel hardware ensures accurate echo detection without phantom signals:

• Maintain a minimum lateral clearance of 300 mm between the rod probe and the vessel wall or internal structures (agitators, baffles, heating coils, heating pipes).
• In non-metallic tanks (such as plastic or glass), maintain at least 500 mm distance from walls and install a metal plate (Ø > 200 mm) beneath the clamp fitting to establish a reference plane.
• Do not install the transmitter in or directly above the filling stream.
• Mounting nozzles must be flush with the vessel top. Long or protruding sockets create unwanted echo reflections and increase the required upper dead band.

Vessel Nozzle Geometry

Avoid high nozzles whenever possible. If nozzles cannot be avoided, select short nozzles with small diameters and run a false signal suppression routine after mechanical mounting is complete.

Welding Precaution

Remove the electronic insert from the transmitter housing prior to carrying out any electric welding on the tank. Failure to do so exposes internal electronics to destructive inductive currents.

Electrical Connection and Terminal Compartment

BURKERT 574562 operates as a 2-wire loop-powered device. Supply voltage and the 4-20 mA / HART signal are carried over the same two-conductor cable.

Terminal Reference	Designation	Connection Function
1	(+)	16...35 V DC operating power supply / signal (+)
2	(-)	Signal return / power ground (-)
3	Pins	Interface connector for display/configuration module
4	Terminal	Internal ground terminal for cable shield

• Conductor cross-sections: Solid wire or stranded wire 0.2...2.5 mm² (AWG 24...14); stranded wire with end sleeve 0.2...1.5 mm² (AWG 24...16).
• Cable gland: M20 × 1.5 for cable diameters between 5 mm and 9 mm.
• Starting current: ≤ 3.6 mA (≤ 10 mA for 5 ms upon initial power application).
• Maximal load resistance: Calculated via $(U_n - U_{min}) / 0.022\text{ A}$.

Display Module and HART Configuration

Article 574562 includes an integrated full dot-matrix LCD display and configuration module. It can be engaged or detached under power without interrupting transmitter loop operation.

Display Module Functions

• Snaps into the electronic compartment in 4 discrete orientations displaced by 90°.
• Four-button navigation: [OK] (enter/confirm), [->] (select field/shift position), [+] (change value), [ESC] (abort/step back).
• Automatic return to standard measurement screen occurs 10 minutes after the last key press.
• Three display screens: large numerical value, value with bar graph, or primary value with secondary variable (e.g. electronics temperature).

Remote Configuration via HART Modem

Remote configuration requires a Windows PC running PACTware with the Type 8189 Device Type Manager (DTM), connected across a 250 Ω communication resistor via a HART-USB modem (article 560177). Parameters can be saved to disk, uploaded to replacement modules, or printed for validation.

Linearization Curves

When applying pre-programmed linearization curves (horizontal cylinders or spherical tanks) to output volume units, the output current becomes proportional to volume rather than physical liquid level. Re-evaluate downstream safety trip setpoints accordingly.

Diagnostics and Status Signaling

Self-monitoring complies with NAMUR NE 107 and VDI/VDE 2650. The transmitter categorizes internal conditions into four distinct diagnostic states:

Status Category	NE 107 Code	Default State	Typical Instrument Cause
Failure	F	Permanently active	Hardware defect (F040), probe breakage (F041), missing echo (F013)
Function Check	C	Activatable	Simulation mode active (C700)
Out of Specification	S	Activatable	Electronics temperature out of range (S600), overfill detected (S601)
Maintenance Required	M	Activatable	Low measurement certainty / echo-to-noise ratio low (M503), no echo (M505)

Internal diagnostic memories preserve up to 100,000 measured values in a ring buffer, 500 non-deletable timestamped events, and baseline setup echo curves for long-term health tracking.

Ordering and Compatible Accessories

Accessory Description	Article Number
HART-USB Modem	560177
Replacement display/configuration module kit (module, transparent cover, seal)	559279
Transparent cover replacement set with sealing ring	561006
Adapter set 2x M20 × 1.5 to ½" NPT with flat seals and blind plugs	551782