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DATA LOGGER
The Waikura Data Logger is designed for monitoring Cathodic Protection (CP) Rectifiers and Test Stations over a period of time. It is housed in a small, lightweight, environmentally sealed, anodised package to enable installation in the field under any weather conditions for any length of time. The instrument is ideally designed for recording half-cell voltages and currents over time and producing pipeline graphs. It has a programmable start and stop time of up to one month ahead to allow automatic recording initiation.
The instrument is connected directly to CP rectifiers and test stations using test leads with quick connect quarter turn 4-pin or 7-pin MS plugs for input (1-2 or 3-4 input channels). It is environmentally sealed to withstand flooding and has an electrically isolated case. The data can be collected over hours, days, weeks or even months and is downloaded to the windows based analysis software on a PC via RS232 serial cable, also connected by a military specification (MS) style plug. The logger has no built in display or user controls as all normal communication and programming is carried out through the computer. The only hardware control is a start/stop facility using an MS shorting plug on the input to allow the logger to be shifted from site to site without requiring a computer.
Features:
- Instrument programming, data upload and graphing is done with a Windows PC interface.
- Automatic data file naming.
- Large memory (400,000 readings) 46 days at every 10 seconds.
- Programmable future start & stop times (up to 1 month ahead).
- Hardware start/stop switch (does not require a computer to move to a new test point).
- Quick connect ¼ turn MS plugs for analogue data inputs and PC serial connection.
- Environmentally sealed (can withstand flooding)
- Small package (fits down 3-inch pipe).
- Long life battery (exceeding 3 months between charges).
- Data head contains logger identification, site number, clock and data summary.
- Data summary contains number of readings, average, maximum, minimum, time below a preset value and time in the day that the data summary is not updated.
Logger Specifications
| Input Range:
Channel 1 Channel 2 Channel 3 Channel 4 |
-10 to +10
V DC -150 to +150 mV DC -10 to +10 V DC -100 to +100 V DC |
| Accuracy: | +-10 mV on
+-10 V range. +-150 m V on +-150 mV range. +-100 mV on +-100 V range. |
| Resolution: (13 bits) | 2.4 mV on +-10
V range. 37 m V on +-150 mV range. 24 mV on +-10 V range. |
| Input Impedance: | 10MW on +-10
V range. 150kW on +-150 mV range. 10 MW on +-100 V range. |
| Input Filter: | Selectable software notch filter to remove 50 or 60 Hz AC |
| A/D Conversion Technique: | 16 bit. |
| Normal Mode Rejection Ratio: | 60 dB at 50 or 60 Hz. |
| Memory: | 512 k model: 400 000 bytes available for data storage. (45 to 60 days at a log every 10 seconds). |
| Log Time Interval: | 1 second to 24 hours in 1 second increments. |
| Clock: | Real time years to seconds. Accuracy 1 minute per month. |
| Future Start: | Maximum time 24 hours ahead. Resolution 1 second. |
| Future Stop: | Maximum time 1 calendar month ahead. Resolution 1 second. |
| Baud Rate: | 9600 baud, 8 bits data, 1 stop bit, no parity. |
| Data Communications: | Standard RS232-C via 4 pin MS plug. |
| Analogue Input: | 4 or 7 Pin MS plugs. |
| Battery: | Internal NiCd rechargeable, 7.2 V, 500 mAh to last at least 2 months between charges (113 days calculated with a log every 10 seconds, not considering battery self discharge). |
| Battery Consumption: | Nominally 32 uA between logs, 32 mA during logs at 20 ° C. |
| Charger: | 11 to 16 volts DC, 50 mA for approx. 14 hours. |
| Case: | Environmentally sealed Anodized aluminium. 70 mm diameter, 200 mm long. |
| Weight: | 750 g. |
| Temperature Range: | -30 to +65 ° C ambient. |
Application Notes:
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|
Waikura Rectifier AN7 |
|
Waikura Data logger AN8 | |
|
Waikura Rectifier brochure |
Designed and manufactured
by: Solid State Equipment Ltd, Lower Hutt,
New Zealand
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