Description Item no.
Seal screw, HL4 003305
Seal screw, HL7 000142
9.5 Maintenance
9.5.1 Clean the sensor port
N O T I C E
Do not put objects in the sensor port or damage to the sensor membrane can occur.
Only the sensor port of the depth sensor can be seen. Clean the sensor port to remove unwanted
material as necessary.
1. To remove calcium, use a syringe to put vinegar in the sensor port. Keep the vinegar in the
sensor port overnight.
2. To remove grease, oil or biological material, use a syringe to put soap or rubbing alcohol in the
sensor port.
3. Put clean water in the sensor port with a syringe.
4. If the substance cannot be removed, contact technical support.
Section 10 Nitrate sensor (007256)
10.1 Specifications
Specifications are subject to change without notice.
Specification Details
Range 0 to 250 mg/L-N
Accuracy ± 10% or ± 2 mg/L-N (the larger value)
Resolution 0.01 mg/L-N
Parameters NO
3
–
or sensor mV
Deployment life of sensor cartridge 3 to 4 months
Life
7
of sensor cartridge 6 months
Maximum depth 15 m (49 ft)
Operating temperature 0 to 40 °C (32 to 104 °F)
10.2 Product overview
The nitrate sensor (007254) is red. Refer to Figure 11.
There is a replaceable sensor cartridge installed in the sensor. Refer to for the deployment life of the
sensor cartridge.
For best results, use the sensor in waters that are pH 3 to 8 and 5 to 40 °C (41 to 104 °F).
The sensor cartridge has a depth limit of 15 meters (49 feet). Remove the sensor cartridge and install
the sensor cap before the sonde is deployed deeper than 15 m (49 ft) to prevent damage to the
sensor cartridge. Refer to the illustrated steps in Figure 12.
To extend the life of the sensor cartridge, remove the sensor cartridge and install the sensor cap
when the sensor is not in use. Refer to the illustrated steps in Figure 12.
7
Deployment life plus the storage life
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