Single Channel Strain Gauge Interface

Features

Support for 120 to 1 K Ohm Gauges
Load Cells Interface
Full, half, Quarter bridge Operation
Precision Temperature Sensor
User Programmable Configuration
SDI-12 / RS-485 Digital Communication Option
Extended SDI-12 Address Support: 0-9 , a-z
16 Bit Precision Low Noise ADC
Low Power - minimal self heating effect - sensor only switched on during acquisition operation.

Engineering and raw data values

Fully Integrated into the Q-LOG Software

Power Supply

10 -18 V

Current

1 mA at acquisition
10 uA standby

Comms Port

Options for
SDI-12 Port
RS-485 Port

Max update rate

1 sec

Cable Clamp Size

1 mm diameter

Bridge Full

Full

Raw Value

Raw data mV/V

Engineering Value

micro-strain,
User defined

Range

User defined, depends on sensor installed

Temp Sensor

Thermistor

Thermistor Type

10K 3A1 Betatherm

Calibration

Steinhart-Hart
Built Pre-defined
Set at manufacture

Accuracy

0.05 Deg
-8 to 25 Deg C

Range

-30 to + 60 Deg

Units

Deg C / Deg F
user select

PCB Dimension

Length

60 mm

Width

19.7 mm

Max depth

11.2 mm

Number Channels

Gauge Resistance

120 - 1K Ohm

Gauge Factor

User Defined

ADC

16 Bit

Statistics

Strain

Max, Min

Temp

Max, Min

Single Channel Strain Gauge Interface

For the AquaLOG Data Recording Instrumentation
Supports SDI-12 or RS-485 digital communications

Geotechnical Services

Part Number: NP-Strain-1

Sensor
Port

SDI-12/RS-485
Communications

Gas Discharge
Lightning Protection

The image opposite shows both the NP-STRAIN-1 PCB. This interface has been designed for operation in harsh environments and due to its small size can be inserted into sensor casings.

The sensor interface is used to convert load cells, strain gauges etc into intelligent stand-alone devices. Upgrade firmware facility for OEM applications.

Supports User scaled calibration factors to allow for any type User defined engineering unit output such as micro-Strain, Load Newtons.

Dimensions ( mm )

Length

60 mm

Width

20 mm

AquaLOG Test Commands

The following command can be used to
test the NP-Strain-1 sensor. SDI-12 / 485 address is 0.

[D] 0M! 0D0!

For full technical details download the technical data sheet
from the Product Technical Notes section of the AquaBat web site.

http://www.aquabat.net/web-forms/AquaBAT-tech.htm

Select Image to download
data sheet

Introduction

The NP-STRAIN-1 is an intelligent general purpose strain gauge interface suitable for direct connection to strain gauges and load cells. The device connects to any suitable logger supports SDI-12 or RS-485 digital communications.

The product is available as a stand-alone PCB for inclusion for OEM applications, or as a complete sensor with a sealed waterproof enclosure.

Advantages:

Digital data transmission - no errors due to signal losses in cable.
In-situ digitisation - local data conversion prevents signal corruption
Data in engineering / raw value - User Selected
Local temperature reading for thermal compensation when required.