Strain Gauge Interface - NP-1-24-STRAIN-SD485
- 1 x Strain Gauge Port
- 2.5 V Bridge Excitation standard
- 1 x Temperature Sensor Input
- 24 Bit ADC
- 10 M Ohm Input Impedance
- SDI-12 / RS485 Digital Communications Options
- Extended SDI-12 Address Support: 0-9 , a-z
- Low Power - Minimised self heating effect
- Engineering and Raw Data Values
- Free Applications Software - Q-LOG Software
- 2.5 mm Pluggable Terminal Block Connections
Installation
Connect the NP-1-STRAIN-24-SD85 card as close as is practically possible to the input signal source in order to minimise electrical noise. Strip the signal and network cable sheaths away from the central wire copper core exposing 3 mm of the metal wire. Open the wire clamp on the pluggable terminal blocks. Secure the network cables into the terminal block and fit onto the network port (A), as shown below.
Keynes Controls manufactures a range of signal condition cards that can be used for a wide range of applications. The cards can be used to monitor voltage, strain gauges, load cells, temperature sensors etc ... The NP-1-24-STRAIN-SD485 card has 1 x 24 bit strain gauge and 1 x thermistor input. An opetional waterproof case and expansion block is available. Support for 120 Ohm, 500 Ohm, 1 K Ohm gauges - others on request.
The Sensor Signal Conditioning Cards can be supplied with an optional USB media converter. The media converters support the SDI12 and RS485 networks.
The NP-1-STRAIN-SD485 is shown opposite connected directly to the USB-SDI12-Pro media converter for direct connection to a Windows PC.
Software
All of the signal conditioning cards are offered with free Windows QLOG software. The QLOG software enables the user to test out the cards prior to installation onto thier own hardware such as a data logger.
Network Operation
The NP-1-24-Strain card supports SDI12 and RS485 operations. The card automatically detects the network onto which it has been connected. The NP-1STRAIN-SD485 supports standard and enhanced addessing modes and is suitable for direct connection to many third party data loggers.
INSTALLATION
The NP-1-STRAIN-24-SD485 card is simple to install and use . It is supplied with spring loaded terminal blocks so no soldering is required to install a sensor. Simple open the port with a screw driver and insert the sensor wire.
The NP-1-STRAIN-24-SD45 card offers 24 bit resolution, low noise signal conditioning for strain gauges and strain gauge based load cells. The card supports full quadratic and linear configuration options for the strain gauge sensor, and full Steinhart-Hart calibration factors for the temperature sensors. Enhanced addressing is available for this product.
In these pictures you can see the quarter bridge and half bridge sensor connection options. The temperature sensor can be extended to fit adjacent to the structure under investigation in order to provide local temperature compensation readings.
The NP-1-STRAIN-24-SD45 can be used with foil strain gauges, resistance based strain gauges, load cells, resistance based displacement sensors.
Part Number : NP-1-STRAIN-SDI485
Engineering Units
All of the Keynes Controls Sensor Signal Conditioning Cards supply raw and SI Unit output measurement values.
The use of industry standard aM! and aD! commands to start a measurement and report the measurement allows the cards to be used with many different 3rd party data loggers and acquisition systems.
For distributed applications the aC! concurrent commend is available to make measurements for all the sensors on a network. a = Address on the network.
Sensor and Network Installation
Get your sensor and network installation done with ease. All of the signal conditioning cards use a 5-Way terminal clamp block for network signal connections, and a 6-Way terminal block for the sensor connections. The terminal blocks use spring loaded clamps to attach cabling so soldering is required. Only a small screw driver is required to attach the sensor and network cables.
All cards are supplied with a copy of the Q-LOG Data Acquisition and Display software.
Configuration and Network Selection Menu for the signal conditioning cards in the Q-LOG Software
Connectors A = Network Connector B = Sensor Connector.
Please note: All products have been designed and manufactured by Keynes Controls. Specifications Include: Single channel 24 bit Strain Gauge / Load Cell Interfaces supports 120 / 350 / 500 Ohm Gauges. Incorporating SDI12 and RS485 Communications Port and optional RTD temperature sensor. Full, Half and Quarter Bridge Support.
Load Cell
The NP-1-STRAIN-24-SD45 card can be used with many different load cells The cards can be used to turn a standard sensor into a network device.
strain gauge load cell, strain gauge amplifier, strain gauge interface, strain gauge measurement, foil strain gauge
Thermistor Interfaces
Part Numbers: NP-1-PT100-24-SD485 (PT100) NP-1-PT500-24-SD45 (PT500) NP-1-PT1000-24-SD485 (PT1000) Thermistor cards
The waterproof enclosure shown opposite is used to protect the Keynes single and dual channel signal conditioning cards. The enclosure enables the cards to deployed close to the sensor installation. Measurements can be taken close to the location of the sensors and sent digitally to a Data Recorder or Data Acquisition System.
Part Number: NP-CASE
Sensors supported. PT100, PT500, PT1000, Strain gauge, full bridge, half bridge strain, quarter bridge strain, pressure sensor, silicon pressure sensor, Load cell, galvanic measurement, thermocouple measurement, Thermocouple Thermocouple Type K, Type J, Type T, Type R, Type S, voltage measurements. RTD, resistive temperature sensor, conductivity, salinity, RTD, Resistive temperature device, SDI12, RS485, QLOG, signal conditioning, sensor interfaces, Geotechnical, vibrating wire, Voltage