There are several considerations when determining whether the deck box and CTD underwater unit will be compatible. (1) In most cases (with the exception being (2), below), instruments with the "-plus" designation are compatible with each other, but the "-plus"...
FAQs
In an inductive telemetry system, what is the maximum recommended resistance of the mooring wire and seawater return path that would allow communications to function properly?
We do not specify a maximum line resistance. However, the Inductive Modem systems are very tolerant of the resistivity of seawater. It is typically only a consideration when the system is being deployed in freshwater lakes, etc. where the salinity level is a lot...
What are the drawbacks to using my own home made artificial seawater instead of filtered seawater on my Seafet external reference pH?
Artificial seawater is problematic because the salts in artificial seawater do not completely dissolve leaving you with a solution that does not completely match the ionic concentration of seawater. This is true for synthetic blends (made for aquariums) or ones made...
What is the optional “Serial Uplink” feature on the SBE 9plus?
This modification allows the SBE9plus CTD to accept an RS-232C serial instrument data stream and transmit to the surface. The acceptable baud rate at the SBE9plus CTD is determined by the EPROM version installed in the modem board. These modem board options include,...
Why is the raw serial output counts on my ECO showing a static output value and not changing?
The detector wiring is damaged, especially if the LED’s are still flashing. NOTE: CDOM channels do not have visible LED’s, so, do NOT look into the CDOM LED port to confirm its operation (!!). The ECO firmware is programmed to output an unchanging “floor” value of...
When should I apply the tau correction in the post-processing of dissolved oxygen data?
Whether the tau correction is applied depends on where the system is being deployed. If the system is to be used in shallow, coastal waters where large vertical gradients that change quickly are expected, the tau correction should be applied, as it accounts for the...
What is the maximum dissolved oxygen concentration that can be accurately measured by the SBE 43 DO sensor?
The measurement range and accuracy of the SBE43 are not defined in discrete units (mL/L, mg/L, µMol/L, etc.) Rather, the range and accuracy specification are expressed as a ratio of the calculated oxygen saturation point. This saturation value depends on the...
Is there an easy way to check if my SBE9plus has the serial uplink feature?
The JT4 bulkhead connector has two options a three pin connector and a four pin connector. If JT4 is a three pin connector, this indicates a standard connector configuration. If JT4 is a four pin connector, that means that the 9plus is configured for 9600 or 19200...
What is the minimum dissolved oxygen concentration that can be accurately measured by the SBE 43 DO sensor?
The measurement range and accuracy of the SBE43 are not definite in discrete units (mL/L, mg/L, µMol/L, etc.) Rather, the range and accuracy specification are expressed as a ratio of the calculated oxygen saturation point. This saturation value depends on the...
What are the differences between a SeaFET/SeapHOx V1 and V2 (software, compatibility, etc.)?
The command interface is different and not inter-compatible for both devices. The sampling and configuration commands are also not inter-compatible. Because of this, they require different software (i.e. SeaFETCom for V1, UCI for V2). The SeaFET/SeapHOx V1 has native...
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