INOR IPAQ-4L Specifications
Multifunction Intelligent
4-wire Isolated Signal Conditioner
IPAQ-4L is a
wire (mains powered) transmitter for temperature measurement and signal conditioning
applications. IPAQ-4L is designed for wall and
DIN rail mounting.
The high isolation of 4000 VAC between
input, output and power supply provides safe
and problem-free measurements.
The Windows based and user friendly software, IPRO 4, is used for transmitter configuration, documentation, monitoring and calibration purposes.
fully universal
and intelligent 4-
Performance and design:
Input-output-supply isolation 4000 VAC
• High level isolation between measurement
loops.
• Excellent filtering of noise and voltage spikes.
• Elimination of ground loops.
Excellent stability
• Long-term stability 0.1 %/year.
Enhanced total system accuracy
• Sensor error correction (for known sensor
errors).
• System error correction (against known
temperatures).
Designed for harsh conditions
• Excellent EMC performance.
• Durable due to protected PCBs.
Flexible and compact mounting
• Only 22.5 mm / 0.89 inch wide.
• Quick mounting on DIN rail.
• Extractable brackets for wall mounting.
Functions:
Current and voltage output
•Programmable: 0/4-20 mA, 0/1-5 V and 0/2-10 V
with direct or reversed action.
Input for RTD, T/C, mV, V, mA and resistance
•Reduced inventory costs.
•Simplified plant engineering.
True on-line communication
•Full access to all features while in operation.
Sensor diagnostics
•SmartSense detects low sensor isolation (essential
for correct measurements).
•Selectable sensor break action.
Simplified loop check-up
•The transmitter works as an accurate current
generator.
On-screen indications and line recording
•Valuable tools for temporary measurements.
5 years limited warranty
IPAQ-4L
Main features of IPAQ-4L
Accuracy and stability
IPAQ-4L is designed for applications with standard industrial demands on accuracy. To reach these demands, the
following factors are essential:
Linearity and calibration errors
-The use of quality compo-
nents and precision calibration equipment reduce these
errors, e.g. ±0.1 % of span for RTD inputs.
High long-term stability
-Internal “self calibration“, by
means of continuos adjustment of important parameters
after comparison with accurate built-in references, contributes to a stability of ±0.1 %/year.
Measurements with RTDs and other resistances
IPAQ-4L accepts inputs from standardized Platinum and
Nickel RTDs like Pt10…Pt1000 acc. to IEC 751 (α=0.00385),
Pt100 acc. to JIS 1604 (α=0.003916) and Ni100/Ni1000 acc.
to DIN 43760, as well as inputs from plain resistance sensors such as potentiometers. 3- or 4-wire connection can
be chosen.
Measurements with thermocouples voltage and current
IPAQ-4L accepts inputs from 11 types of standardized
thermocouples as well as plain mV, V and mA input.
For T/C input, the CJC (cold junction compensation) is
fully automatic, by means of an accurate measurement of
the terminal temperature. Alternatively, the CJC can be
disabled.
Customized linearization and Engineering units
The Customized linearization can be used to create a linearization curve for RTD, T/C, resistance, voltage and current
inputs. By combining Customized linearization with the use
of Engineering units, the transmitters can be programmed
to give a linear output corresponding to a specific measuring range expressed in the primary process value.
The sensor characteristics are described by a maximum of
9 data pairs. Fig. 1a and 1b.
Fig.1a
100
Sensor
output
0-50 mV
20
kPa
4
mA
Transmitter
System
Transmitter
output
4-20 mA
kPa
100
Process
value
0-100 kPa
Fig.1b
mV
50
0
Exemple of a system (sensor + transmitter) with an output linear to
the process value, in spite of a non-linear sensor.
Sensor
Sensor
Sensor or System error correction
IPAQ-4L offers two ways of improving the measurement
with temperature sensors:
Sensor error correction
- Known sensor errors compared
to the standard curve, e.g. for a calibrated sensor, are entered, and the transmitter automatically corrects for the
sensor errors. Fig. 2.
Fig.2
Sensor error correction
Sensor output
[Ω/mV]
∆T
2
∆T
1
T
min
.T
1
max
T
2
System error correction
Standard curve
Sensor curve
Temp.
[°C/°F]
.T
-This method is used to correct the
T
min
and T
max
1
and T2.
= End values
of the measuring range.
∆
T1 and ∆T2=Deviations
from Standard curve
at T
The transmitter
compensates for the
deviations and transforms
the Sensor curve to a
Standard curve
system error (sensor + transmitter error) by exposing the
sensor to one (one-point correction) or two (two-point correction) accurately measured temperatures (true temperatures).The true temperature(s) are entered, and the transmitter automatically corrects for the system errors. Fig. 3.
Fig.3
Two-point System error correction
Reading [mA]
20
12
4
∆out
2
True curve
(corrected)
T
2
System curve
(before correction)
max
.T
∆out
1
min
.T
1
T
Temp.
[°C/°F]
T
min
and T
max
of the measuring range.
∆
out1 and ∆out2= Deviations from True curve at
T
1
and T2.
The transmitter
compensates for the
deviations and transforms
the System curve to a
True curve
= End values
SmartSense - Sensor isolation monitoring
SmartSense continuously monitors the isolation resistance
of thermocouples and 3-wire connected RTDs as well as
the cabling between sensor and transmitter. The transmitter will react by forcing the output to a user defined level
if the isolation is too low. SmartSense requires an extra
lead inside the thermocouple or RTD. Fig. 4.
For detailed information, see section Theory and Facts.
Sensor break monitoring
IPAQ-4L monitors sensor break and forces the output signal to a user defined level, when any sensor lead is broken
or disconnected. The sensor break monitoring can be
switched off. The monitoring is furnished with a pulsed ex-
citation current. This eliminates the voltage drop in the
lead wires (giving a measuring error), caused by a standard DC excitation current.
Controlled output for instrument calibration
IPAQ-4L can be set to automatically provide a recurring
output signal of 0%, 50% and 100% of the selected output
signal regardless of the input value. The total time for the
controlled output is adjustable up to 30 minutes.
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