ABB Navigator 550 Spares Replacement Procedures

Information INF13/114–EN
Navigator 550
Hydrazine wet-section
Spares replacement procedures
1 Safety
Warning.
These procedures must be carried out by a trained technician.
CHEMICAL

Ensure personal protective equipment (PPE) such as
and
gloves eye protection
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).
are worn during any
2 Tools required

Pozidrive screwdriver

Slot-head terminal screwdriver

Anti-static strap.
3 Replacement procedures
Modbus cable assembly –
see Section 3.1, page 2
Fig. 3.1 Low level dissolved oxygen wet-section – replacement procedures
PCB housing seals,
PCB cover and PCB –
see Section 3.1, page 2
Constant-head
assembly, pressure
switch assembly and
pressure switch cable –
see Section 3.4, page 3
Solenoid valve assembly
and solenoid valve cable –
see Section 3.4, page 3
Flowmeter assembly
and flowmeter cable –
see Section 3.2, page 2