Deep SUNA Manual
For SUNA running firmware version 2.4 or later
3. The SUNA Sensor
3. The SUNA Sensor
3.1 Introduction and Background
The SUNA (Submersible Ultraviolet Nitrate Analyzer ) is a chemical-free nitrate sensor.
It is based on the ISUS (In Situ Ultraviolet Spectroscopy) technology developed at
MBARI (cf. Kenneth S. Johnson, Luke J. Coletti, In situ ultraviolet spectrophotometry for
high resolution and long-term monitoring of nitrate, bromide and bisulfide in the ocean,
Deep-Sea Research I 49 (2002) 1291–1305).
3.2 Specifications
3.2.1 Build Variants
The SUNA housing is made from anodized aluminum. The housing is designed to
withstand depths of up to 2000 m.
Table 1: Sensor dimensions, basic options.
Dimension
Basic Version
Material
Anodized Aluminum
Depth Rating
2000 m
Diameter
57 mm
Length
(without connector and anode)
555 mm
UV Deuterium Lamp
900 h lifetime
Path length
10 mm
Displacement
1384 cm³
Weight
1.8 kg
Electrical connector
SubConn MCBH8MNM
Storage temperature
–20 to +50 C
Operating temperature
--2 to +35 C
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