Provides excitation current for up to 8 model 229 soil-water sensors
Resumen
The CE8 is a current-excitation module that applies a constant current to the heating element of up to eight 229 Heat Dissipation Water Matric Potential Sensors. A current-excitation module is required when using 229 probes to measure soil water matric potential.
Leer másVentajas y características
- Provides excitation current for up to eight 229 probes
- Permite conectar hasta ocho multiplexores AM16/32, lo cual amplia significativamente la capacidad del sistema
- Compatible con la mayoría de dataloggers Campbell Scientific
Imágenes
Descripción detallada
The CE8 is typically activated via a datalogger control port. When the CE8 receives the datalogger's control signal, all eight of the CE4's channels output a 50 mA source current to the connected loads. When the control signal is dropped to 0 Vdc, output from the module ceases.
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Preguntas frecuentes
Número de FAQs relacionadas con CE8: 7
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Compatibilidad
Nota: lo siguiente muestra información de compatibilidad notable. No es una lista de todos los productos compatibles.
Dataloggers
| Producto | Compatible | Nota |
|---|---|---|
| CR1000 (retired) | ||
| CR1000X (retired) | ||
| CR200X (retired) | ||
| CR216X (retired) | ||
| CR300 (retired) | ||
| CR3000 (retired) | ||
| CR310 | ||
| CR350 | ||
| CR5000 (retired) | ||
| CR6 | ||
| CR800 (retired) | ||
| CR850 (retired) | ||
| CR9000X (retired) |
Miscelaneo
| Producto | Compatible | Nota |
|---|---|---|
| 21X (retired) | ||
| CR10 (retired) | ||
| CR10X (retired) | ||
| CR23X (retired) | ||
| CR500 (retired) | ||
| CR510 (retired) | ||
| CR9000 (retired) |
Información de compatibilidad adicional
Data Logger Considerations
The CABLE3CBL can be used to connect the CE8 to the data logger. (See the Ordering information.)
Power Considerations
The CE8 requires 12 Vdc power. A data logger control port is typically used to activate the module. When the control signal is received, all 8 channels output a 50 mA source current to the connected loads (typically 229 probes). When the control signal is dropped to 0 Vdc, output from the module ceases.
When active, the current required from the 12 V supply is approximately the following:
25 mA + (50 mA)(the number of 229 sensors connected to the CE8 outputs).
Multiplexers
The CE8 can source current for eight probes directly. In applications that require more sensors, the output(s) of the CE8 can be connected to as many as eight AM16/32B multiplexers, greatly expanding system capacity.
When using multiplexers, the user should be aware that switching currents of greater than 30 mA will degrade the contact surfaces of the mechanical relays. This will adversely affect the suitability of these relays to multiplex low voltage signals. Although a relay used in this manner no longer qualifies for low voltage measurements, it continues to be useful for switching currents in excess of 30 mA. Therefore the user is advised to record which multiplexer channels are used to multiplex the 50 mA excitation for the 229-L probes in order to avoid using those channels for low voltage measurements in future applications.
Enclosure Considerations
The CE8 requires a desiccated, non-condensing environment; a Campbell Scientific enclosure is recommended. The CE8's case has mounting flanges for attachment to the 1"-on-center hole grid of Campbell Scientific enclosures. Grommets and screws are provided to attach the flanges to the backplate of our enclosures.
Especificaciones
| Output | 50 mA (regulated) |
| Output Channels | 8 |
| Power | 12 Vdc source required |
| Active Current Drain | 25 mA + (50 mA) x (number of 229s connected to the CE8) |
| Compliance | CE compliant |
| Dimensions | 16.5 x 5.4 x 2.7 cm (6.5 x 2.1 x 1.1 in.) |
| Weight | 184 g (6.5 oz) |