Level indicator for solids | PFG57 | Rotary

Rotary blade level indicator used for detecting a level threshold, generally full or empty, in a silo or bin. Sturdily built thanks to its aluminium casing and small in size, it is ideal for installation in small tanks or load cells and, in accordance with the most recent ATEX standards, for use where the atmosphere is potentially explosive owing to the presence of dusts/powders.

Advantages

Easy to install: specific tools or settings are not required.
Extremely versatile and with an excellent quality price ratio.
Provides the highest standard of safety in the presence of potentially explosive dusts/powders.
Probe can be adapted to the material monitored thanks to the wide range of paddles available.
Extremely reliable, the instrument can be used in addition to radar, capacitive, ultrasound or continuous level probes as a safe signal.

Product line: Rotary paddle level switches

Materials: Level sensors for solids

Configure and request an offer Request information

Certifications

ATEX

II 1/2 D Ex ta/tb IIIC T85°C IP65 Da/Db

IECEx

Ex ta/tb IIIC T85°C Da/Db

Eurasian Conformity

EurAseC Conformity

UKCA

UK Conformity.

ATEX

II 3D Ex tc IIIB T85°C Dc

Technical Specifications

Casing and cover in die-cast aluminium
Shaft in AISI 303 / EN 1.4305 stainless steel on life-lubricated sealed bearings, with dust-tight retaining ring in NBR
Broad range of paddles in polyamide or AISI 304 / EN 1.4301 stainless steel
1” 1/2 Gas (BSPP) process connection and M20x1,5 single cable entry
Rotation speed 1 turn / minute
Ambient temperature -20° to +70°C (-4° ... +158°F)
Process temperature -20° to +70°C (-4° ... +158°F)
Process pressure 0.8 to 5 bar (11.6 to 72,5 psi)
IP65 protection rating (dust-tight, protection against water jets)
Power consumption max 4 W
Contact capacity 0,1A 250VAC / 24VDC
Micro switch SPDT output signal

If the product is to be used in areas with explosive atmospheres, the following characteristics apply:

Process pressure 0.8 to 1.1 bar (11.6 to 15.9 psi)

CONFIGURATOR

Electrical Specifications

The electrical part of the entire range of PFG57 level probes can be supplied with different voltage ratings and numerous optionals:

Available voltage ratings: 115/230V or 24/48V – 50 … 60Hz (AC) and 24V (DC).
Standard version with faston connectors.
Paddle terminals or self-locking spring terminals are available on request.
4 RPM: increased rotation speed to reduce trip time.
Low temperatures: enable the instrument to function down to -40°C.

PFG57 level indicators feature an adjustable spring, which allows the operating torque to be increased or decreased depending on the material to be detected.

Compared to the standard setting, the highest setting increases the torque by +67%, while the lowest setting decreases it by approximately −89%.

By applying these percentage variations to the minimum density detectable by the propeller, it is possible to estimate the range of densities that can be detected by the device.
However, it should be noted that the values indicated are influenced by variables such as the weight and size of the propeller, as well as the type and particle size of the material.

For this reason, it is recommended to always select the most suitable propeller for the material to be detected, using the spring adjustment exclusively for calibration purposes if further adjustment in the field is necessary.

Estimation of detectable densities

Assuming, for example, that the selected propeller is AC1 (reference density: 1 kg/dm3), we can estimate the following values:

Spring adjustment	Torque (Nm)	Approximate bulk density (kg/dm³)
Least load (right)	0,004	0,05 – 0,20
Standard (centre)	0,035	0,80 – 1,10
More load (left)	0,052	1,40 – 1,90

Choice of paddle

An essential component that ensures the level indicator functions correctly, the paddle is the basis from which customizing starts since it can be adapted to every type of use.
To make the best choice, it is important to bear in mind the following 5 key points:

Each material has a minimum density that must be detected by the instrument.
The minimum diameter of the entry hole through which the paddle can pass if it cannot be installed inside.
The diameter occupied by the paddle as it turns.
The number of blades changes depending on the intensity of the disturbances to which the paddle is exposed.
Polyamide or stainless steel, depending on the type of material with which the paddle comes into contact.

Documentation

Technical datasheet

3D model (STEP)

Manual

3D Paddles models (STEP)

M12 connector connection diagrams

EU Declaration of Conformity

EU Declaration of Conformity (models with lamp)

UK Declaration of Conformity

Brochure

Paddles list

Related products

PFG57X

Small-sized level sensor with rotary paddle, made of aluminium and stainless steel. It can be applied with G 1” 1/2 (BSPP) process connection or flange (or tri-clamp). Particularly suitable for the detection of food and corrosive materials. The range of paddles allows the level switch to detect materials with densities between 0.1 and 2.0 kg/dm3. The instrument can be customized.

PFG57AT

Small-sized rotative level sensor, made of aluminum and stainless steel. It can be applied with G 1" 1/2 (BSPP) process connection or with flange. Designed for high temperature and explosion risk environments, also ideal for corrosive substances. The selection of paddles allows the level switch to detect materials with densities between 0.1 and 2.0 kg/dm3. The instrument can be customized.

PFG57I Small size level sensor with rotary paddle for plaster machines

PFG57I for plaster sprayers

Small-sized level sensor with rotary paddle, made of sturdy die-cast aluminum. It can be applied with G 1” 1/2 (BSPP) process connection or flange. It is a specific variant for plaster. The instrument can be customized with special lengths and electrical accessories.

PFG05

Rotary paddle level switch made of durable die-cast aluminum with G 2” 1/2 (BSPP) threaded process connection or flange. A wide choice of paddles allows the level switch to detect materials with densities between 0.1 and 2.0 kg/dm3. The instrument can be customized with special lengths and electrical accessories.

PFG09

Level sensor with rotary paddle, explosion-proof, suitable in environments with gaseous, explosive or flammable mixtures. It is made of aluminum, and it can be applied with G 1” ½ process connection or flange. A wide choice of paddles allows the level switch to detect materials with densities between 0.1 and 2.0 kg/dm3. The instrument can be customized.