Information INF13/114–EN
Navigator 550
Hydrazine wet-section
Spares replacement procedures
1 Safety
2 Tools required
Pozidrive screwdriver
Slot-head terminal screwdriver
Anti-static strap.
3 Replacement procedures
Warning.
These procedures must be carried out by a trained technician.
CHEMICAL
Ensure personal protective equipment (PPE) such as
gloves
and
eye
protection
are
worn
during
any
maintenance.
Observe all health and safety procedures for handling
chemicals.
To familiarize yourself with handling precautions, dangers
and emergency procedures, always review the Material
Safety
Data
Sheets
prior
to
handling
containers,
reservoirs and delivery systems that contain chemical
reagents and standards.
Take care if cleaning any spillages and observe all relevant
safety instructions. Wipe up any spillages using clean
water.
Perform general cleaning of the wet-section using a damp
cloth only – mild detergent can be used as a cleaning aid.
Do not use Acetone or any organic solvents.
ELECTRICAL
Isolate all high voltage supplies to the transmitter before
performing replacement procedures.
The wet-section is vulnerable to electrostatic damage.
Wear an anti-static strap or dismantle the wet-section on
an anti-static workbench.
Ensure all electrical connections are kept dry at all times.
GENERAL
Shut off the external sample supply to the wet-section
before performing replacement procedures. When a
procedure is complete, restore power to the transmitter,
sample to the wet-section at the correct flow rate and, if
necessary, calibrate the wet-section – refer to the
wet-section Operating Instructions (OI/AHM550-EN) for
calibration instructions.
Dispose of the old components in accordance with the
guidelines
contained
in
the
Operating
instructions
(OI/AHM550-EN).
Fig. 3.1 Low level dissolved oxygen wet-section – replacement procedures
Modbus cable assembly –
PCB housing seals,
PCB cover and PCB –
Flowmeter assembly
and flowmeter cable –
Constant-head
assembly, pressure
switch assembly and
pressure switch cable –
Solenoid valve assembly
and solenoid valve cable –
