Light Sensor for Visible Light

The light sensor is a factory installed option on top of the SediMeter. The blue-enhanced photo diode sensor is mounted inside a transparent cone, to avoid sedimentation over it. As default it measures light in a linear scale from ca 100 lux to 178 klx. This is equivalent to the range from a livingroom to bright sunlight. The LogDator allows the sensor to be sampled up to 84 times per measurement, with a rate varying from 0.5 Hz to 50 Hz. Each value is measured with ca 44 lux resolution, 16 times per sample, and reported with ca 2.7 lux resolution. The measurement unit is user-selectable in software, e.g., to units of energy per time and area. (NB: The light sensor can be mounted on a standard or long end plug.)

Item: LM-07-01

$390

Order with:
SediMeter 2A
SediMeter 2F
LogDator 2"

Pressure Sensor: Depth, Tides, Waves

The pressure sensor measures the absolute pressure. It may be used to monitor the tide, but also for waves, since the LogDator allows the sensor to be sampled up to 84 times per measurement with a rate of 0.5 Hz to 50 Hz. The SediMeter software can be used to estimate average depth, wave period, etc. The sensor is made from stainless steel. The nominal maximal measurement depth is 24 m. The reported resolution is <1 mm. The accuracy depends on temperature and depth, with an estimated range of 20 mm to 100 mm. For so accurate depth measurements a correction for atmospheric pressure must be made. The absolute maximal depth for the sensor is beyond that for the SediMeter and LogDator. Upon request other ranges are available. The units are user-selectable in software, e.g., to pressure in hPa. NB: This sensor requires a longer end plug.

Item: LM-08-01

$490

Order with:
SediMeter 2A
SediMeter 2F
LogDator 2"

UW Network Connector

Bulkhead connector that brings the RS-485 wires to the outside of the SediMeter (or LogDator). They are under-water pluggable. They contain 2 contacts for communication, and 2 for supplying remote power.

In real-time monitoring operation, up to 255 devices can be daisy-chained, with cables running from instrument to instrument. The last unit needs one UW connector, the others need 2 each. The photo shows the connector mounted on a standard end-plug. If two are used, they will be mounted horizontally on a long end plug.

This option can also be used for downloading data without retrieving the SediMeter or LogDator. A diver would connect a cable from the computer to the instrument, and wake it up for listening using a magnet. After downloading the data he would disconnect the cable and replace the protective dummy plug.

Item: LM-09-01

$340

Order with:
SediMeter 2A
SediMeter 2F
LogDator 2"

Network:
USB to RS-485
Cable Connector
UW signal cable

Accessory:
Dummy plug

Spares:
Grease

Faster temperature sensor

This thermometer will react to temperature changes within seconds, as compared to minutes for the standard thermometer. If ordered with a LogDator it will replace the built-in thermometer in the data, and not occupy any of the optional channels. If ordered with a SediMeter it must be connected as an optional sensor, thus occupying one of the two available optional channels.

Item: LM-10-01

$190

Order with:
SediMeter 2A
SediMeter 2F
LogDator 2"

Long End Plug

Some options on this page require a long end plug. When ordering optional sensors, they will be mounted on the size plug that is required. If you specifically wish to get this size plug, even if not required, include it in the order.

Item: LM-03-01-B

$120