PT113
Instruction Manual
3
2.3 STANDARD SUPPLIED ITEMS
The following are the items supplied as standard. Please check the contents of your package before
installing and advise PT of any discrepancies.
2.4 ACCESSORIES SOLD SEPARATELY
The following accessories are available for separate purchase.
•
RS-232C cable with null modem wiring and 9 pin connector for PC connection for all models.
•
RS-232C to USB adapter. Adapts DB9 connector of RS232C cable to USB.
•
RS-485 to USB cable for PT113MB
•
Load cells, cable and junction boxes are available on the PT web site.
2.5 DEFINITIONS AND CONVENTIONS
ADC:
Analogue to digital converter, converts the analogue signal into a digital signal.
DAC:
Digital to analogue converter, converts the digital signal to an analogue signal, usually after some digital
signal processing.
Dead weight:
Dead weight is the self weight of the platform or scale load carrying structure on the load cells without
the contents or items to be weighed. The output voltage of the load cell in response to the weight of the
platform is usually the zero offset. The zero offset must be within the range of the instrument adjustment
for correct operation.
Live weight
:
The weight that is applied to the scale and shown on the indicator.
Excitation voltage:
The voltage that is supplied by the indicator to the load cell.
Load cell:
Load cell is a device that converts force to electronic voltage. A load cell consists of two parts. The first
part is a sensor that can be linearly distorted according to the force applied to it. The second part is the
strain gauge element which changes its resistance according to the distortion of the sensor.
Load cell rated output:
The output voltage from the load cell divided by the excitation voltage at load cell rated capacity. This is
usually expressed in mV/V.
Input range:
The maximum range of input that the device can accept. This is usually stated in mV and for a full load
cell system is calculated from the number of load cells (Lcn), mV/V (LCmv) and capacity (LCcap) and
also the maximum total load (TL) (including dead load) on the load cells and the excitation voltage (EV).
Input Range (mV) = TL / (LCn * LCcap) * LCmv * EV
Note: A summing box with corner adjustment will reduce this value slightly.
FSO:
