PIN LOAD CELL TYPE PR

Product catalog summary

Applications
The PR pin type load cell is designed for use in crane weighing systems and other applications where load measurement on a pin is required. Typical uses include crane overload control and measuring rope load or belt tension.

Main Features
- Immersion-proof and stainless steel plasma welded construction.
- Available with double bridge output for redundancy.
- Options for CIA 404 output and analog output (4-20mA).

Specifications
- Nominal Load: 500 Kg to 100 Tons.
- Compliance: VDI/VDE 2637.
- Metrological Characteristics: Linearity ±0.5%, Hysteresis ±0.05%, Repeatability ±0.04%, Creep ±0.03%.
- Temperature Range: -10°C to +40°C.
- Electrical Data: Output signal at nominal load 1 mV/V, Supply voltage 5-12V, Maximum supply voltage 15V, Input/Output impedance 350±1% Ω, Insulation resistance >1000 MΩ.

Mechanical Data
- Breaking Load: >500% of nominal load.
- Nominal Deflection: <0.2 mm.
- Cable Length: 3 m.

Environmental Conditions
- Working Temperature: -10°C to +40°C.
- Storage Temperature: -40°C to +85°C.
- Housing Protection: IP-68.

Description
The load cells use strain-gages on a metallic core to detect strain from applied loads. They are wired in a Wheatstone bridge configuration, providing an output signal proportional to the load and supply voltage. The PR model offers high reliability due to its stainless steel construction and plasma welded seal disks.

Installation
Load cells must be installed on rigid structures to avoid measurement errors from deflection. They should be protected from direct sunlight, wind, and rapid temperature changes. Proper mounting conditions, including matching hole diameter and load distribution, are crucial to ensure the breaking load is not compromised.

Catalog excerpts

CELMI s.r.l. Largo Brugnatelli 13/16 20090 BUCCINASCO (MI) ITALY Tel+39-0245712209 Fax+39-0245705836 Internet:www.celmi.com PIN LOAD CELL TYPE PR APPLICATIONS The pin type load cell model PR is mainly foreseen for applications on cranes weighing systems or, in general, where the load applied on a pin have to be measured. Typical applications are: - Crane overload control - Rope load, belt tension measurement, etc. MAIN FEATURES - Immersion proof construction - Stainless steel plasma welded construction - Available with double bridge output (for redundant system) - Available with output (CIA 404) - Available with analog output 4-20mA NOMINAL LOAD : from 500 Kg to 100 Tons SPECIFICATION IN ACCORDING TO VDI/VDE 2637 METROLOGICAL CHARACTERISTICS Nominal load Ln t 0,5÷100 Initial load Lp % Ln 5 Maximum load Ll % Ln 260 Linearity (Best line) Flin ±% Ln 0,5 Hysteresis Fu ±% Ln 0,05 Repeatability Fv ±% Ln 0,04 Creep 30' Fcr ±% Ln 0,03 Nominal temperature range Btn °C -10 +40 Zero temp. coefficient (10°C) TK0 ±% Cn 0,2 Output temp. coefficient (10°C) TKC +% Cn 0,6 Ambient pressare effect Fpr %Ln/KPa 0 ELECTRICAL DATA Output signal at nominal load Cn mV/V 1 Supply voltage nominal range Bsu V 5-12 Maximum supply voltage US max V 15 Input impedante Re Ù 350±1% Output impedante Ra Ù 350±1% Insulation resistance @ 50V Ris M Ù >1000 Zero signal output D0 mV/V ±0,05 MECHANICAL DATA Breaking load Ld % Ln >500 Nominal deflection Hn mm <0,2 Cable lengt m 3 ENVIROMENTAL CONDITIONS Working temperature range Btu °C -10 +40 Storage temperature range Bts °C -40 +85 Housing protection IP-68 All the characteristics depend on the mounting conditions

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DESCRIPTION Strain-gage load cells are made by a metallic core over which one or more strain-gages are stick; the strain-gages detect the strain of the metal produced by the load applied on the load cell. The strain-gages are wired in a Wheatstone bridge mode in such a way that the voltage on one diagonal of the bridge (output signal) is proportional to the load and the supply voltage (mV/V). Pin load cells are normally used in single cell weighing systems and, thus, the output signal is not calibrated at zero and full scale as the calibration have to be done, anyhow, at the transmitter. Model...

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