Crane Weighing » Custom Load Pin
|
|
 |
HIGHLIGHTS
- Shear pins are very versatile and usd in many tension load applications
- They don't use crane head space
- Load pins are custom designed to fit your mounting
- They can replace clevis pins
- Pin load is accurate to 1-2% full scale
- Load pins are very susceptible to side loads so pin loading must be in one direction only
|
|
CUSTOM LOAD PINS
Shear pins are custom made pins that are suitable anywhere tension load is being applied to a pin that you wish to get a weight measurement for. Pin load can be measured in crane sheaves, shackes, or anywhere that load is supported by a pin. Shear pins are sometimes referred to as force sensing clevis pins, lifting pins, weight pins, force pins, or load pins but they are all the same in that they are all strain gauge transducers that measure weight. Pin loading must be in one direction only or side loading will occur and reduce pin load accuracy. To this end, keeper plates are often employed to keep the force pin aligned properly.
SPECIFICATIONS
| Capacities |
Shear pins are available in any capacity (custom) |
| Accuracy |
Pin load is accurate to 1% to 2% of full scale (varies by application) |
| Safe Overload |
150% safe overload (standard but customizable) |
| Ultimate Overload |
300% ultimate overload (standard but customizable) |
| Full Scale Ouput |
2 mv/v nominal (standard) |
| Maximum Excitation |
15 volts DC (standard) |
| Operating Temp |
-50°C to +80°C (standard) |
| Compensated Temp |
-10°C to +40°C (standard) |
| Thermal Zero Shift |
0.00155 full scale / degree F |
| Sealing Standard |
IP-67 (standard) protected against high pressure jets of water and short periods of emersion
IP-68 (available) protected against high pressure jets of water and long periods of emersion at depths of up to 5m H2O
|
| Non Linearity |
+/- 0.03% full scale |
| Material |
17-4PH Stainless Steel (standard) |
| Bridge Resistance |
350 Ohm (standard) |
|
 |
WIRED SHEAR PIN (HARD CONNECT)
Tension measurement can be displayed by an indicator via wired connection (see wired digital indicator). The cable connection between the shear pin and display can be a seal-over hard connect. This is suitable for installations where the load pin is not expected to be disconnected from the indicator. Please specify how much home run cable is required.
|
 |
WIRED SHEAR PIN (MILITARY CONNECT)
External indicators can also be connected to the force pin via 4-pin military style quick-disconnects. This allows for easy disconnection and reconnection from the weight pin should the shear pin ever need to be moved, repaired, or stored. The drawback of military connectors is that their sealing standard is not as high as hard wired connections. Quick disonnect cable comes in 10', 20', and 50' lengths.
|
 |
WIRELESS SHEAR PIN CONNECTION
Tension load can be displayed by external indicator that communicates wirelessly with the lifting pin. Wireless load pins have a cabled connection to a wireless transmitter and battery box that then communicate with the indicator (see wireless digital indicator). The force pin is powered by 4 AA batteries with a life of 200+ hours of continuous use. The shear pin enters sleep mode when not in use to protect battery life and has wireless range of 40 meters line of sight.
|
 |
M2000 DIGITAL INDICATOR
The recommended indicator for tension application is the wired M2000. If the crane is located outside, the M2000 should be purchased in a NEMA enclosure (see left photo) to protect against dust and water. Various enclosures are available (see below images) and more details about the M2000 are available in the product guide (see right).
|
 |
SETPOINT OPTION CARD
The M2000 is available with a Setpoint option card. These are overload detection and protection devices. Setpoints utilize solid state relays that can be used to trigger alarms or switch devices (i.e. motors) on or off at specified weights. When ordering the Setpoint optoin the type of device (AC or DC) being switched must be specified. Setpoints are often used with shear pins for crane scale applications.
|
 |
PARTS OF LINE SOFTWARE
The M2000 can be loaded with a special program that allows a crane operator to adjust the display for multiple "Parts of Line". The program is configurable for one to twelve parts of line and the software will be provided free of charge when needed with the purchase of an M2000 Indicator with a shear load pin.
|
 |
REMOTE SCORE BOARD
Remote score boards are often referred to as "remote displays". This type of display must be used in conjunction with a digital indicator equipped with a serial output. The remote display mirrors what is displayed on the weight indicator. They are used in applications where weighing information needs to be seen at a distance from the indicator. Score boards are available in 2" (50 foot visibility, 4.5" (250 foot visibility) and 6.5" (300+ foot visibility) lettering.
|
 |
4-20 mA SIGNAL CONVERTER
We can supply 4-20 mA ouput versus standard mv/V signal. The design incorporates a load cell shield connection and polarity insensitive current loop connections. It is not susceptible to damage from shorting loop leads together or to ground during operation and is specifically designed for ESD hazardous envornments. These converters are usually used in systems that use a PLC.
|
|
|
|
|
|
|
|
