New Product
Temperature Monitoring Relay
K8DT-TH
Ideal to prevent heater overheating.
Self-latching output to contribute to safe
equipment operation.
• Set the temperature with ultra-simple rotary switches.
• Digitally set the temperature to between 0 and 999°C in 1°C increments with one
Relay (K8DT-TH1@@).
(K8DT-TH2@@: Set to between 0 and 1,800°C in 10°C increments.)
• Connect a thermocouple or platinum resistance thermometer.
• Width of 17.5 mm to reduce space required in panels.
• Push-In Plus Terminal that reduce wiring work.
The use of cage clamps enables wiring with bare stranded wires.
Double-insertion holes for crossover wiring (all terminals).
• UL listed for easy shipping to North America.
• Models added with transistor outputs for superior contact reliability.
Refer to
Safety Precautions
on page 9.
For the most recent information on models
that have been certified for safety
standards, refer to your OMRON website.
Ordering Information
Temperature Input Models
Power supply
voltage
24 V AC/DC
100-240 V AC
24 V AC/DC
Thermocouple
100-240 V AC
Setting unit: 10°C/°F
*
Input types
Setting units (setting range)
Output relays Type
Relay: SPDT contact output
Thermocouple or
platinum resistance
thermometer
Setting unit: 1°C or 1°F
(0 to 999°C/°F)
Transistor
Relay: SPDT contact output
Transistor
Relay: SPDT contact output
Transistor
Relay: SPDT contact output
Transistor
Model
K8DT-TH1CD
K8DT-TH1TD
K8DT-TH1CA
K8DT-TH1TA
K8DT-TH2CD
K8DT-TH2TD
K8DT-TH2CA
K8DT-TH2TA
*
Refer to Setting Ranges on page 3 for the setting ranges.
Options (Order Separately)
Front Cover
Appearance
Model
Y92A-D1A
1
K8DT-TH
Ratings and Specifications
Ratings
Power supply
voltage
Allowable voltage
range
Power
consumption
Rated insulation
voltage
Sensor
inputs
K8DT-TH1
K8DT-TH2
K8DT-TH@@D: 24 VAC 50/60 Hz or 24 VDC
K8DT-TH@@A: 100 to 240 VAC 50/60 Hz
85% to 110% of power supply voltage
24 VAC or 24 VDC: 2.1 VA max. or 1.2 W max.
100 to 240 VAC: 3.1 VA max.
253 VAC
Thermocouple: K, J, T, E;
Platinum-resistance thermometer: Pt100, Pt1000
Thermocouple: K, J, T, E, B, R, S, PL II
Set of three rotary DIP switches
Power (PWR): Green,
Alarm (ALM): Red
Relay Output: SPDT contact
Transistor Output: 1
Rated load
5 A at 250 VAC (Resistive load)
5 A at 30 VDC (Resistive load)
1 A at 250 VAC (Inductive load)
0.2 A at 48 VDC (Inductive load)
Minimum load: 5 VDC, 10 mA (reference values)
Mechanical life: 10 million operations min.
Electrical life: 5 A at 250 VAC or 30 VDC: 50,000
operations
3 A at 250 VAC/30 VDC: 100,000
operations
Rated voltage: 24 VDC (maximum voltage: 26.4 VDC)
Maximum current: 50 mA DC
20 to 60°C (with no condensation or icing)
Noise immunity
25 to 65°C (with no condensation or icing)
25% to 85% RH (with no condensation)
25% to 85% RH (with no condensation)
2,000 m max.
Stranded wires, solid wires, or ferrules
0.25 to 1.5 mm
2
(AWG24 to AWG16)
Vibration resistance
Shock resistance
Degree of protection
Insulation resistance
Applicable
standards
Specifications
Measurement
accuracy
Hysteresis width
Sampling cycle
K8DT-TH1@@: ±1% of the setting range or ±4 °C,
whichever is larger.
K8DT-TH2@@: ±1% of the setting range (±1%FS).
2°C
100 ms
EN 61010-1
Approved
Installation environment:
standards
Overvoltage category II, pollution level 2
EMC
EN 61326-1
*
Safety
UL 61010-1 (Listing)
standards
Korean Radio Waves Act (Act 10564)
20 M min.
Between all external terminals and the case
Between all power supply terminals and all input
terminals
Between all power supply terminals and all output
terminals
Between all input terminals and all output
terminals
3,000 VAC for 1 min
Between all external terminals and the case
Between all power supply terminals and all input
terminals
Between all power supply terminals and all output
terminals
Between all input terminals and all output
terminals
6 kV (between live terminals and exposed,
non-charged metal parts)
Square-wave noise of 1 s/100 ns pulse width with
1-ns rise time
100 to 240 VAC: 1,500 V power supply terminal
common/normal mode
24 VAC: 1,500 V power supply terminal common/
normal mode
24 VDC: 480 V power supply terminal common
Frequency: 10 to 55 Hz, 0.35-mm single amplitude
10 sweeps of 5 min each in X,Y, and Z directions
100 m/s
2
, 3 times each in 6 directions along 3 axes
Terminals: IP20
Setting method
Indicators
Output form
Output relay
ratings
Dielectric strength
Transistor output
ratings
Ambient operating
temperature
Storage
temperature
Ambient operating
humidity
Storage humidity
Altitude
Applicable wires
Applicable wire
size
Impulse withstand
voltage
*
Industrial Electromagnetic Environment (EN/IEC 61326-1, Table 2)
Wire insertion force
8 N max. for AWG20 wire
Screwdriver
insertion force
Wire stripping
length
Ferrule length
15 N max.
8 mm
8 mm
XW4Z-00B (Omron)
Recommended flat-
SZF 0.4 2.5 (Phoenix Contact)
blade screwdriver
210-719 (Wago)
SDI 0.4 2.5 75 (Weidmuller)
Current capacity
Number of
insertions
Case color
Case material
Weight
Mounting
Dimensions
10 A (per pole)
50 times
N1.5
PC, UL 94 V-0
Approx. 100 g
Mounts to DIN Track, or screw mounting
17.5
90
90 mm (W D H)
2
K8DT-TH
Setting Ranges
K8DT-TH1
Centigrade
Input
Setting
temperature
range
1000
800
600
400
200
0
Fahrenheit
K
999
J
850
T
400
E
600
Pt100
850
Pt1000
850
Input
Setting
temperature
range
1000
800
600
400
200
0
K
999
?
J
999
T
700
E
999
?
Pt100
999
?
Pt1000
999
?
?
?
?
?
0
0
0
0
0
0
0
0
0
0
0
0
Minimum setting
increment
1°C
Minimum setting
increment
1°F
K8DT-TH2
Centigrade
Input
1,800
1,700
1,600
1,500
1,400
1,300
1,200
1,100
1,000
900
800
700
600
500
400
300
200
100
0
K
J
T
E
B
1,800
R
1,700
S
1,700
PL II
1,300
1,300
Setting
temperature
range
850
600
400
100
0
0
0
0
0
0
0
Minimum setting
increment
10°C
Fahrenheit
Input
3,200
3,100
3,000
2,900
2,800
2,700
2,600
2,500
2,400
2,300
2,200
2,100
2,000
1,900
1,800
1,700
1,600
1,500
1,400
1,300
1,200
1,100
1,000
900
800
700
600
500
400
300
200
100
0
K
J
T
E
B
3,200
R
3,000
S
3,000
PL II
2,300
2,300
Setting
temperature
range
1,500
1,100
700
300
0
0
0
0
0
0
0
Minimum setting
increment
10°F
Temperature Input Range
K8DT-TH1
Input type
K
J
T
E
Pt100
Pt1000
---
---
Lower
limit
−20
−20
−20
−20
−20
−20
---
---
°C
Upper
limit
1019
870
420
620
870
870
---
---
Lower
limit
−40
−40
−40
−40
−40
−40
---
---
°F
Upper
limit
1039
1039
740
1039
1039
1039
---
---
K8DT-TH2
Input type
K
J
T
E
B
R
S
PL II
Lower
limit
−20
−20
−20
−20
0
−20
−20
−20
°C
Upper
limit
1320
870
420
620
1820
1720
1720
1320
Lower
limit
−40
−40
−40
−40
0
−40
−40
−40
°F
Upper
limit
2340
1540
740
1140
3240
3040
3040
2340
3
K8DT-TH
Connections
Terminal Diagram
K8DT-TH1 C A
(1) (2)(3)
(3) Power supply voltage
A: 100 to 240 VAC
D: 24 VAC/VDC
(1) Temperature sensor input
TH1
TH2
A1
B+
−
B−
A2
B−
A
A1
A2
A1
A2
B B
+
B+
B−
A
A
B+
(No polarity)
(2) Output
DIP SW
12
14
11
14
C: Relay Output
T: Transistor Output
12
11
14
11
Inside
Inside
Note: 1.
Do not connect anything to terminals that are shaded in gray.
2.
There is no polarity for the DC power supply input.
Timing Charts
Temperature Alarm: Hysteresis: 2°C or 2°F
Temperature settings
Temperature alarm upper limit
(11) to (14)
Temperature alarm lower limit
(11) to (14)
Changing between Normally Open and Normally Closed
Power supply
Temperature alarm or other error
Relay output (normally open)
(11) to (14)
Relay output (normally closed)
(11) to (14)
Note: Other errors: sensor open circuit error, sensor input error,
temperature setting error, and memory error.
2°C (°F)
2°C (°F)
Functions
SV Protection
This function protects (i.e., prohibits changing) the alarm setting,
operating method, and modes for the Temperature Monitoring Relay
that have been set on the rotary switches and DIP switch.
The protection function is activated by pressing the output latch reset
button on the Temperature Monitoring Relay for at least 5 s. The
power indicator will flash when the protection is activated.
The protection function can be released by pressing the output latch
reset button on the Temperature Monitoring Relay for at least 5 s. The
power indicator will light while the protection is being reset.
Latched Operation:
Relay outputs remain latched even after the alarm or error is reset.
Power supply
Temperature alarm or other error
LATCH_RESET
Relay output (latched)
(11) to (14)
0.02 s
Note: If LATCH_RESET is enabled, alarm status will be retained even if the power supply is cycled.
To clear the alarm status, press the LATCH_RESET button.
(Default: Latching enabled.)
Operation of Indicators
Power supply
SV Protect Mode
Flashing
PWR_LED
Power supply
Temperature alarm
Other error
ALM_LED
Flashing
4
K8DT-TH
Nomenclature
Front
K8DT-TH1
K8DT-TH2
Terminal block
(See note.)
Terminal block
(See note.)
Power indicator
Temperature setting
switch for increments
of 100°C/°F
Temperature setting
switch for increments
of 10°C/°F
Temperature setting
switch for increments
of 1°C/°F
LATCH_RESET button
*
Power indicator
Temperature setting
switch for increments
of 1,000°C/°F
Temperature setting
switch for increments
of 100°C/°F
Temperature setting
switch for increments
of 10°C/°F
LATCH_RESET button
*
Alarm indicator
Alarm indicator
Temperature unit
(Black out
the unnecessary label:
°C or °F.)
Temperature unit
(Black out
the unnecessary label:
°C or °F.)
Terminal block
(See note.)
Terminal block
(See note.)
Note:
Use solid wires, stranded wires, or ferrules to connect to the
terminals.
To maintain the withstand voltage after connecting the
terminals, insert 8 mm of exposed conductor into the terminal.
Solid Wire
Stranded Wires
Ferrules
Error (ALM indicator: Flashing)
One of the following items 1 to 3 has occurred.
1.
The sensor circuit is disconnected or the temperature setting is out
of the specified range.
2.
The temperature setting is out of the specified range.
3.
There is a problem in the internal circuits.
8 mm
8 mm
8 mm
Corrections
1.
Check for incorrect wiring, circuit disconnections, short circuits,
and whether the input type and temperature settings are correct.
2.
Disable SV Protect Mode.
3.
If the wiring and settings are correct, reset the power supply.
If the Unit resumes normal operation, the problem may have been
caused by noise.
If the Unit does not resume normal operation, it must be replaced.
*
Latching and the SV Protect Mode are stored in non-volatile
memory. An error may occur if the data is updated more than one
million times.
*
If you press and hold the LATCH_RESET button for 5 seconds or
longer, the SV Protect Mode will go into effect.
When SV Protect Mode is enabled, the PWR indicator flashes.
To disable the SV Protect Mode, press and hold the
LATCH_RESET Button for at least 5 seconds.
Temperature Setting Switch
The rotary switches are used to set the alarm value.
Point the arrow to the required number.
5
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