i
AI - 7481
(48 X 48)
AI - 7781
(72 X 72)
AI - 7981
(96 X 96)
AI - 7681
(96 X 48)
AI - 7881
(48 X 96)
USER’S OPERATING MANUAL FOR PID DIGITAL TEMPERATURE CONTROLLER
(Models: AI 7481 / 7781 / 7981 / 7681 /
)
7881
1. DISPLAY TYPE
: Dual
4- Digit
7 segment LED
4 Digit Bright Red (PV)
4 Digit Luminous Green (SV)
STATUS LED’S
: OP 1
: Main Control Output
2. INPUT
Sensor input
: TC : J,K,R,S,N,T,B
RTD : Pt-100
Range
: Refer below table.
Sampling Time : 125 msec.
Resolution
: 1°C/0.1°C(Only for RTD)
CJC for TC
: Built in automatic
LWC for Pt-100
: Built in upto 18E max.
Digital Filter : 1 to 10 Sec.
3. RELAY OUTPUT
Contact type
: N/O, CM, N/C
Contact Rating
: 5A @ 250VAC or 30 VDC
Life expectancy
: > 5,00,000 operations
Isolation
: Inherent
4. SSR DRIVE OUTPUT
Drive Capacity
: 12V @ 30mA.
Isolation
: Non-Isolated.
5. FUNCTION
Output 1
: Main Control output
Control Action : ON-OFF/PID (Select)
Control Mode : Heat/Cool (Select)
6. ENVIRONMENTAL
Operating Range
: 0 ~50°C, 5~90% Rh
Storage Humidity
: 95% Rh (Non-condensing)
7. POWER SUPPLY
Supply Voltage
: 90~270VAC, 50/60Hz.
Consumption
: 4W Maximum.
8. PHYSICAL
Housing
: ABS Plastic.
SPECIFICATIONS : -
SAFETY INSTRUCTION :
This controller is meant for temperature control
applications. It is important to read the manual prior to
installing or commissioning of controller. All safety
related instruction appearing in this manual must be
followed to ensure safety of the operating personnel
as well as the instrument.
GENERAL
v
The controller must be configured correctly for intended
operation. Incorrect configuration could result in
damage to the equipment or the process under control or
it may lead personnel injury.
v
The controller is generally part of control panel and in
such a case the terminals should not remain accessible
to the user after installation.
MECHANICAL
v
The Controller in its installed state must not come in
close proximity to any corrosive/combustible gases,
caustic vapors, oils, steam or any other process by-
products.
v
The Controller in its installed state should not be
exposed to carbon dust, salt air, direct sunlight or radiant
heat.
v
Ambient temperature and relative humidity surrounding
the controller must not exceed the maximum specified
limit for proper operation of the controller.
v
The controller in its installed state must be protected
against excessive electrostatic or electromagnetic
interferences. Ventilation holes provided on the chassis
of the instrument are meant for thermal dissipation
hence should not be obstructed in the panel.
ELECTRICAL
v
The controller must be wired as per wiring diagram & it
must comply with local electrical regulation.
v
Care must be taken not to connect AC supplies to low
voltage sensor input.
v
Circuit breaker or mains s/w with fuse (275V/1A) must be
installed between power supply and supply terminals to
protect the controller from any possible damage due to
high voltage surges of extended duration.
v
Circuit breaker and appropriate fuses must be used
for driving high voltage loads to protect the controller
from any possible damage due to short circuit on loads.
v
To minimize pickup of electrical noise, the wiring for low
voltage DC and sensor input must be routed away from
high current power cables. Where it is impractical to do
this, use shielded ground at both ends.
v
The controller should not be wired to a 3-Phase supply
with unearthed star connection. Under fault condition
such supply could rise above 264 VAC which will damage
the controller.
v
The Electrical noise generated by switching inductive
loads might create momentary Fluctuation in display,
alarm latch up, data loss or permanent damage to the
instrument.
To reduce this use snubber circuit across the load.
v
It is essential to install a over Temp. Protection device to
avoid any failure of heating system. Apart from spoiling
the product, this could damage the process being
controlled.
Model no.
Display height (PV)
Display height (SV)
AI-7481
0.30”
0.56”
0.80”
0.36”
0.36”
0.36”
0.36”
0.24”
0.39”
0.56”
AI-7881
AI-7781 AI-7981 AI-7681
Fe-k(J) T/C
Cr-AL(K) T/C
Sensor Type
Accuracy
o
± 1 C
o
0 ~ 1700 C
o
0 ~ 1700 C
o
0 ~ 1800 C
o
-100 ~ 450 C
Resolution
Range
o
1 C
o
1 C
o
1 C
}
(R) T/C
(S) T/C
TC - N
TC - T
TC - B
Pt-100(RTD)
Pt-100(RTD 0.1)
o
0
~
760 C
o
-99
~
1300 C
o
-99
~
1300 C
o
-99
~
400 C
o
-99.9 ~ 450.0 C
o
1 C
o
1 C
o
1 C
o
1 C
o
1 C
o
0.1 C
o
± 0.3 C
OP1
PV
SV
TUNE
SET
AT
-therm
i
AI-7981
OP1
PV
SV
-therm
i
AI-7781
SET
AT
AI-7481
OP1
PV
SV
SET
AT
SET
AT
PV
SV
AI-7681
OP1
PV
SV
AI-7881
OP1
SET
AT
1
OIM AI-7X81 V2.0 Page 1 of 6
