NP-1-VOLT-24-SD85 by Keynes Controls
+/- 5V DC / Voltage Analogue Input Card
The NP-1-VOLT-24-SD85 is an intelligent general purpose interface card suitable for direct connection to a range of analogue signals for conversion in a digital value.
The device can be connected to any suitable device supporting the SDI-12/5485 network and is fully integrated into the free Keynes Controls Q-LOG Data Display and Recording Software.
A PT100 temperature sensor interface is also included in the design. The card can be used to convert voltage to SI units. The card supports both SDI12 and RS485 digital networks.
User-Programmable Interface
The NP-1-VOLT-24-SD85 is User Programmable and can supply results in both raw or engineering unit format. A precision temperature sensor input is supplied for applications when temperature compensated measurements are required..
Sensor Port
View looking into the Port
Pin-out Sensor Input Port
1 + Thermistor
2 - Thermistor
3 -Vin / 0V
4 + V In
5 N/A
6 N/A
Network Port
View looking into the Port
Pin-out Sensor Input Port
1 Gnd
2 +12
3 RS485 -
4 RS485 +
5 SDI-12
Product Features
| TYPE | |
| 1 x +/- 5 V DC Input Channel | |
| Other ranges on request | 50 V /10 V / 5 V /250 mV / 50mV |
| 1 x Temperature Sensor Input | PT100 / User Defined |
| 10 M Ohm Input Impedance | |
| User Programmable Scaling Factors | |
| SDI-12 / RS485 Digital Communications Options | |
| Extended SDI-12 | Address Support: 0-9 , a-z |
| 24 Bit ADC Analogue Input | |
| Low Power | Minimised self heating effect |
| Engineering and Raw Data Values | |
| Free Applications Software | Q-LOG Software |
| 2.5 mm Pluggable Terminal Block Connections | |
| OEM Customisation option. |
This device has been designed for operation in harsh environments and still has the ability to be easily installed in the field.No special installation tools or plugs are required, simply push into the cable clamps mounted on the front and back of the unit.
Technical Specifications
| Network Type | ENVIRONMENTAL CHARACTERISTICS |
| Power Supply | 10 -18 V |
| Current | 2 mA at acquisition 10 uA standby |
| Input Range +/- 5V DC | +/- 5V DC Other ranges on request SDI-12 Port |
| SDI-12 Port | 1 x Port Version 1.03 |
| Max update rate | 1 Sec |
| Cable Clamp Size | 2.5 mm diameter |
| Bridge Excitation | 0 - 4.5 V DC |
| Raw Value | Raw data mV/V |
| Engineering Value | Vn, mV/V User Defined |
| Range | +/- 5V, Other ranges on request. |
| Temp Sensor | Thermistor |
| Thermistor Type | 3 K EC95 F type material 10K3A1 Betatherm |
| Calibration | Steinhart-Hart Set at manufacture |
| Accuracy | 0.05 Deg -8 to 25 Deg C/td> |
| Range | -30 to + 60 Deg |
| Units | Deg C mv, V - User Defined |
| RMS Noise (Typical values)PCB Dimensio |
less than 1 uV/V less than 0.01 Deg C |
| Length | 75 mm |
| Width | 24 mm |
| Max depth | 10 mm |
| Cable Entry | 1 m Screw terminal |
| Number Channels | 1 |
| Input Impedance | 10 M Ohm |
| ADC | 24 Bit |
| Resolution | 0.6 uV for +/- 5 V Range |
| USB-SDI12-Pro | PIN | NP-1-VOLT-24-SD85 Network Port | PIN |
| SDI-12 Data | 1 | X | 1 |
| Not Used | 2 | X | 2 |
| +12 V DC | 3 | X | 3 |
| Gnd / Ov | 4 | X | 4 |
| X | 5 | X | 5 |
Installation
Connect the NP-1-VOLT-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.
Repeat the cable installation for the input signal source and temperature sensor as required. Figure 4 below shows the card network and sensor input ports.
OEM Applications
The NP-1-VOLT-24-SD85 PCB can be supplied customised for third party applications. Contact Keynes Controls for more details.
Free Applications Software
The card is supplied with the Q-LOG application software. Q-LOG can be used for Configurations, Test Measurement and Data Recording.
The Q-LOG software can be downloaded at: