Rotary paddle level switch for monitoring a level threshold – typically ‘full’ or ‘empty’ – for solid materials inside silos or containers. Robust construction with an aluminium housing; its compact size makes it particularly suitable for installation on small tanks or load cells, and for use in potentially explosive atmospheres due to the presence of dust, in accordance with the latest ATEX standards.
Product line: Rotary paddle level switches
II 1/2 D Ex ta/tb IIIC T200°C IP65 Da/Db
Ex ta/tb IIIC T200°C Da/Db
II 3D Ex tc IIIB T200°C Dc
EurAseC Conformity
UK Conformity.
If the product is to be used in areas with explosive atmospheres, the following characteristics apply:
The electrical part of the entire range of PFG57 level probes can be supplied with different voltage ratings and numerous optionals:
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:
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:
PFG05ATFV
Rotary paddle level indicator made of robust die-cast aluminum and stainless steel for all parts in contact with the product, with fixing flange. Variant for condensate drain and temperatures up to 600°C. The choice of propellers allows the detection of 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.
AC1INOX1
AC3INOX4
AC4INOX1
AC5INOX4
AC5LINOX4
AC6INOX1
AC7INOX1
AC8INOX4
AC9INOX2
AC10INOX2
AC11INOX4
AC12INOX1
AC14INOX1
AC15INOX1
AC16INOX1
AC17INOX4
AC18INOX4
Custom paddle
Standard cable entry plugs, ATEX / IECEx certified closing caps and cable glands.