ADC 410F Instruções de Operação descarregar pdf (Página 60)

7/9

Always switch off power source before opening the housing !

quired measuring instruments and tools

- Special wrench to unscrew the covers, a crosstip screwdriver

- Ohmmeter with at least 6 V range

AC voltage/resistance measuring bridge.

Note: Accurate measurements in the area of the electrodes can only be obtained with an

AC voltage/resistance bridge. Also, the measured resistance is very heavily dependent on

the electrical conductivity of the liquid product.

Preparatory work

• Switch off power source.

• Unscrew covers from terminal and electronic

compartments using the special wrench.

If provided, remove the display unit. For this

purpose, detach the two screws R and fold

display unit to the side, see figure in Sect. 8.5.

• Pull off the blue 9-pin plug from the amplifier

PCB, see figure in Sect. 8.9, field power

supply (Pin 7+8) and signal cables

(Pin 1, 2, 3, 4 + 5)

• Completely fill the measuring tube of the

flowmeter with the process liquid.

7.5 Test of primary head

Action Typical result Incorrect result =

Resistance measurement flowmeter defective,

at the blue 9-pin plug return to factory for repair,

refer to last but one page !

1 Measure resistance 30 - 150 Ω if lower:

between wires interwinding fault

7 and 8.

if higher:

wire break

2 Measure > 10 MΩ if lower:

resistance between interwinding fault to PE

U-clamp terminal or FE.

in terminal compartment

(PE protective conductor

or FE functional ground)

and wires 7 and 8

3 Measure resistance 1 kΩ - 1 MΩ if lower: drain measuring

between wires 1 and 3 (see “Note” above). tube and repeat

and between 1 and 4 Both values should be measurement; if still

(same measuring lead approx. equal. too low, short-circuit in

always on wire 1 ! ) electrode wires.

if higher: break in

electrode wires or

electrodes

contaminated.

Values not equal:

break in electrode

wires or electrodes

contaminated.

Jacks X1 and X4 on amplifier PCB,

see Sect. 8.9

Blue 9-pin plug

(connection to primary head)

unassigned

7 8 1 2 3 4 5

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 ... 78 79

Comentários a estes Manuais

Sem comentários

ADC 410F Instruções de Operação Página 60

Comentários a estes Manuais

Manuais e produtos relacionados com Redes ADC 410F