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®
Protecting the
Integrity of
Industrial
Process Signals
Multi-Channel, Thermo-
ACTIONI/Q
Q424
& Q425
MODEL
couple Input, Three-Wire
Transmitter
Provides Two DC Outputs in
Proportion to Two Thermocouple
Millivolt Inputs
Benefits
n Multi-Channel Design
Provides Two (2) Threewire Transmitters in 1
Package
n Eliminates Ground
Loops with 1800VDC
Input-to-Output Isolation
n High Density DIN Rail
Mounting
n SnapLoc, Plug-In Screw
Terminals for Low
MTTR
n I/QRail Power Bus
Connector Saves
Installation Time
n Output Linear to mV
Input
n Standard Input Ranges
for the Most Popular
Applications
n Three Year Warranty
DESCRIPTION
The ActionI/Q models Q424 and Q425 are DIN rail mount, thermocouple input, isolating, dual (2) channel three-wire transmitters.
Each channel accepts a thermocouple input and is isolated from the
DC output signal. The output is linear to the millivolt input (not linear
to temperature). Cold junction compensation is provided. Each input
channel is fully isolated (1800VDC) from the outputs which are
common to the same power supply.
All ActionI/Q modules feature SnapLoc, plug-in, screw terminals for
easy installation and low Mean-Time- To-Repair (MTTR). If desired, two or more modules can slide together and interlock for solid,
high density mounting. This is accomplished by removing the foot or
the adjacent unit's face plate, for right-hand side or left-hand side
mounting, respectively. The module to be attached will easily slide on
to the side of the mounted unit.
APPLICATION
Thermocouple input, three-wire transmitters are used to convert a
specific temperature range into a 4-20mA or 0-10VDC signal.
Three-wire transmitters are primarily used in remote locations near
the sensor since they reduce the probability of signal errors and save
wiring costs by utilizing one of the two power wires as a common
reference, sending either a 4-20mA or 0-10VDC signal. These
signals are usually monitored by a control system or displayed for an
operator.
OPERATION
The ActionI/Q models Q424 and Q425 operate as three-wire
transmitters allowing a voltage or current output signal from 24VDC
power. The Q424 provides a dual channel 4-20mA output and the
Q425 provides a dual channel 0-10VDC output. The power input of
An Invensys Company
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the Q424 and Q425 are protected from reverse
polarity. Zero and span pots are provided for
each channel to calibrate the output to the input
thermocouple (+/-5%).
The Q424 (4-20mA output) and Q425 (0-10VDC
output) provide an isolated, dual (2) channel,
thermocouple input, three-wire transmitter in
one package. Standard input temperature ranges
(see Table 1) are calibrated to rated accuracy.
One range per module; two channels per module. For other ranges contact the factory.
OPTION
B Downscale burnout detection
(upscale standard).
CALIBRATION
1) To check calibration, connect the input to a
calibrated thermocouple simulator or millivolt
source (thermocouple wire corresponding to
the input range may be required; check your
calibrator's capabilities). Connect the power to
a 24VDC source capable of supplying at least
200mA. Connect the output to the actual device
load or to a load equivalent to the actual device
load value and monitor the output with a voltage
or milliamp meter.
Note: To maximize thermal stability, final calibration should be performed in the operating
installation, allowing at least one hour for
warm up and thermal equilibrium of the system.
2) Set the calibrator to the specified minimum
temperature or equivalent millivolt value and
adjust the zero potentiometer for minimum
output.
3) Set the calibrator to the specified maximum
temperature or equivalent millivolt value and
Table 1: Q424 and Q425
Input Type and Range*
J, 0-500oF J, 0-1000oF J, 0-500oC T, 0-500oF
K, 0-500oF K, 0-2000oF K, 0-1000oC T, 0-250oC
*Consult factory for other ranges
adjust the span potentiometer for maximum
output.
4) Repeat steps 2 and 3, as necessary, to
validate calibration.
SPECIFICATIONSSPECIFICATIONS
SPECIFICATIONS
SPECIFICATIONSSPECIFICATIONS
Input Types: Accepts two J, K or T type thermocouples
Ranges: see Table 1
Burnout Detection Upscale standard; Downscale, option B
Cold Junction
Compensation Error 1oC typical, 0 to 55oC ambient;
Output Drive 4-20mA: 10V max., 500Ω max. load 0-10V: 10mA max., 1KΩ
min. load (each channel)
Supply Voltage Range: 18 to 30VDC
Current: 60mA maximum per channel
In Rush: 180mA max.
Output Accuracy < 0.1% of full scale input (mV) typical, <0.2% maximum @23oC;
Adjustability Front accessed 10 turn, + 5% of span for zero and span, typical
including linearity, repeatability and hysteresis (not including CJC
error).
MODELS AND ACCESSORIES
Accessories
All ActionI/Q modules mount on standard TS32 (model
MD02) or TS35 (model MD03) DIN rail. In addition the
following accessories are available:
MD02 TS32 DIN rail
MD03 TS35 x 7.5 DIN rail
G905 24VDC Power Supply (500mA)
H902 24VDC Power Supply (200mA)
H910 24VDC Power Supply (1 Amp)
H915 24VDC Power Supply (2.1 Amp)
IQRL I/QRail Power Distribution Bus
Ordering Information
Specify:
1. Model: Q424 (4-20mA output)
or Q425 (0-10VDC output)
2. Input Range: (see Table 1)
3. Option: (see Options)
4. Accessories: (see Accessories)
Terminal Connections
Pin B1: Channel 1, Output (+)
Pin B2: Channel 2, Output (+)
Pin B3: Power (+)
Pin B4: Power & Output (-)
Pin C1: Not Internally Connected
Pin C2: Channel 2, T/C Input (-)
Pin C3: Channel 2, T/C Input (+)
Pin C4: Not Internally Connected
Pin C5: Channel 1, T/C Input (-)
Pin C6: Channel 1, T/C Input (+)
Pin P1: Not Internally Connected
Pin P2: Not Internally Connected
Pin P3: Power (+)
Pin P4: Power (-)
Stability < 0.025%/oC of full-scale maximum for full-scale and
zero
Isolation 1800VDC or peak AC, input to output and input to input
channel (output channels are common)
ESD Susceptibility Capable of meeting IEC 801-2 level 2 (4kV)
Response Time 100mSec typical (10 to 90%)
Temperature Operating: 0 to 55oC (32 to 131oF)
Storage: -25 to 70oC (-13 to 158oF)
Humidity (non-condensing) Operating: 15 to 90% (@45oC)
Soak: 90% for 24 hours (@60oC)
Wire Terminal Socketed screw terminals for 12-22 AWG
Weight 0.34lbs
Agency Approvals CSA certified per standard C22.2 (File No. LR42272).
UL recognized per standard UL508 (File No.
E99775).CE conformance per EMC directive 89/336/
EEC and low voltage 73/23/EEC (Input <75VDC).
DIMENSIONS
721-0559-00-F 9/00
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