Installation And Preparation For Use; Calibration And Measurement - Mettler Toledo InPro 4501 Instructions D'utilisation

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4. Installation and preparation for use

1. On unpacking, and again prior to installation, check the elec-
trode visually for signs of mechanical damage to the glass
membrane, the shaft and the connector. Report any faults or
defects immediately to your authorized METTLER TOLEDO
dealer.
2. Remove the watering cap and rinse the electrode with dis-
tilled or de-ionized water. Use only soft tissue to dab the
electrode dry. Do not rub the glass membrane since this can
lead to sluggish response behavior of the electrode.
3. Electrodes with a dry glass membrane must be conditioned
for several hours in a 3 mol KCl solution before being used.
4. Connect always the solution ground (blue cable) to the trans-
mitter.
5. Use PTFE tape to seal the NPT thread.
6. If possible use the protection sleeve (order no. 52 401 808).
5. Cabling
The InPro 4501 VP is equipped with a VarioPin connector. To
connect the cable to the electrode, attach and gently rotate
until the connector is engaged (groove). Screw the cable cap
nut onto the electrode until the connection is secure. The plug
assembly should be fitted hand-tight only; no tools should be
used. For details of the exact assignment of the individual cable
leads to the VP pins, please refer to the instruction leaflet
"Preparation of the cable for connection to the transmitter" sup-
plied together with the cable.
InPro 4501 fixed cable. There are two options for termination
for the InPro 4501 with fixed cable:
• BNC connector for pH combination electrode with stripped
and tinned leads for RTD and solution ground.
• Stripped and tinned leads for pH combination electrode, for
RTD and solution ground.
Refer to your transmitter instruction manual for correct wiring.
ATTENTION: T he solution ground lead is designed to go to a
Color
black/transparent
red
grey
blue
white
green
green/yellow

6. Calibration and measurement

InPro 4501 VP electrodes require two-point calibration. Before
calibration, the watering cap must be removed from the pH
electrode. The electrode is then dipped successively into two
different buffer solutions, each of known pH value, and the
transmitter calibrated to these buffer values (for example, buf-
fers pH 4.01 and pH 7.00). Please note the instructions given
in the operating manual of the transmitter. Calibration should
be repeated as and when needed.
© 02 / 16 Mettler-Toledo GmbH
Printed in Switzerland
galvanically isolated terminal on the transmitter
and should not be used as an outer ground shield.
If the transmitter does not have sensor diagnos-
tics, this lead should be left unterminated.
Function
Glass
Coax shield/reference
RTD sensing (temperature sensor,
3-wire connection)
Solution ground
RTD return (temperature sensor,
2-wire connection)
RTD in (temperature sensor,
2-wire connection)
Cable shield
InPro 4501 pH Combination Electrode
InPro 4501 pH Combination Electrode
52 002 390