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Metrohm 854 iConnect User Manual

Metrohm Equipment

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CH-9101 Herisau
[email protected]
www.metrohm.com

854 iConnect

Introduction

The 854 iConnect is the measuring input for elec-
trodes with an integrated memory chip (iTrodes).
The analog-digital converter in the 854 iConnect
transforms the analog measuring signal of the
electrode into digital pulses directly at the sensor.
As a result of the digital data transfer, the meas-
uring signal is no longer prone to electrostatic
influences. A transmission free from interferences
can be guaranteed no matter how long the elec-
trode cable is.

Connecting the iConnect

The 854 iConnect can be connected to the fol-
lowing devices:

Titrandos with an iConnect connector

867 pH Module

Connecting to a Titrando
Either one or two 854 iConnect can be connec-
ted to a Titrando depending on the Titrando's
model version.

Plug the iConnect plug of the 854 iConnect
into the socket "iConnect" of the Titrando.
Make sure that the marking on the plug
matches the marking on the Titrando as
shown in figure 1.

Fig. 1: Connecting the 854 iConnect

The 854 iConnect is detected automatically
and entered as measuring input into the
device properties of the Titrando. If an elec-
trode is connected to the 854 iConnect that
is not yet listed in the sensor list of the con-
trol software, a corresponding message is dis-
played.

The 854 iConnect can be plugged in and discon-
nected without problems while the instrument is
switched on.
Connecting an electrode

Remove the protective cap and connect the
electrode as shown in figure 2. The guide pin
guarantees correct connection in such a way
that the contact pins cannot be damaged.

Tighten the screw coupling with two fingers.

Fig. 2: Connecting an electrode

Note

Screw on the protective cap when the 854
iConnect is not in use as a protection against
chemicals and mechanical impact.

Technical specifications

Measuring interface

Potentiometry:

Input resistance

> 1 · 10

12

Ω

Offset current

< 1 · 10

-12

A under

reference conditions

Polarizer:

Polarization current
Ipol

1)

–122.5…+122.5 µA
in steps of 2.5 µA

Polarization voltage
Upol

2)

–1225…+1225 mV
in steps of 25 mV

1)

–125.0 / +125.0 µA: non-guaranteed values,

dependent on reference voltage +2.5 V

2)

–1250 / +1250 mV: non-guaranteed values,

dependent on reference voltage +2.5 V
Measuring ranges

pH values:

Range

–13…+20 pH

Resolution

0.001 pH

Measuring accuracy

1)

±0.003 pH

Voltage:

2)

Range

–1200 mV…
+1200 mV

Resolution

0.1 mV

Measuring accuracy

1)

±0.2 mV

Current:

3)

Range

–120 µA…+120 µA

Resolution

0.01 µA

Temperature:

Range
Pt1000
NTC

–150 °C…+250 °C
–5 °C…+250 °C

4)

Resolution
Pt1000
NTC

0.1 °C
0.1 °C

Measuring accuracy

1)

Pt1000

±0.2 °C (–20 °C…
+150 °C)

NTC

±0.6 °C (+10 °C…
+40 °C)

1)

± 1 digit, without sensor error, under reference

conditions

2)

potentiometric and voltametric

3)

amperometric

4)

for an NTC sensor with R (25 °C) = 30'000

Ω

and B (25/50) = 4100 K.
Power supply

Power supply

via data cable, e.g.
from Titrando

Operating voltage

5 V

Power consumption

approx. 10 mA dur-
ing measurement

Safety specifications

Design and testing

According to
EN/IEC/UL 61010-1,
CSA-C22.2 No.
61010-1
Protection class III

Electromagnetic compatibility

Emission

Standards fulfilled:
EN/IEC 61326-1
EN/IEC 61000-6-3
EN 55022 / CISPR 22

8.854.8001EN

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