Metrohm 854 iConnect - Manual

CH-9101 Herisau
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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 1/2