Chapter 2 Specifications
2 – 67
Specification
EH-TC8
Applicable thermocouple types (selectable)
Conforms to JIS C 1602-1995 Type K, E, J, T, B, R, S, N
Temperature conversion data
Signed 15 bits
Type
Accuracy guaranteed range
Input range
K
-200 to 1200
°
C 0.4% (FS)
-270 to 1370
°
C
E
-200 to 900
°
C 0.3% (FS)
-270 to 1000
°
C
J
-40 to 750
°
C 0.3% (FS)
-270 to 1200
°
C
T
-200 to 350
°
C 0.8% (FS)
-270 to 400
°
C
B 600
to
1700
°
C 1.0% (FS)
0 to 1820
°
C
R
0 to 1600
°
C 1.0% (FS)
-50 to 1760
°
C
S
0 to 1600
°
C 1.0% (FS)
-50 to 1760
°
C
Measuring temperature range
and accuracy *1
N
-200 to 1200
°
C 0.4% (FS)
-270 to 1300
°
C
Cold junction temperature error *2
±
2
°
C maximum (Ambient temperature 15 to 35
°
C)
±
3
°
C maximum (Ambient temperature 0 to 55
°
C
）
Resolution
0.1
°
C / 0.1
ﾟＦ
(K, E, J, T, N) 1.0
°
C / 1.0
ﾟＦ
(B, R, S)
Number of Input channels
8
Conversion time
108/860ms
Channel and Internal circuit
Photo-coupler insulation
Insulation system
Between channels
No insulation
External connection
Removable type screw terminal block (M3)
External power supply
24V DC
±
10% 100mA at the maximum
External wiring *3
Shield cable
Internal current consumption
70mA
maximum
Error detection
Over upper limit value /
Breaking wiring detection
Data: H7FFF (corresponding number LED flashes.)
Under lower limit value
Data: H8000
*1
The sum of accuracy of each sensor and the cold junction temperature error is the overall accuracy. Note that thermocouple
device includes small level of error.
*2
Error is the value of 10 minutes after power up. Error may increase slightly due to quick change of ambient temperature.
*3
The maximum length of thermocouple wire is 100m (328ft.), however, it depends on environmental conditions.
Terminal configuration
No.
Signal name
Diagram of Internal circuit
[1]
CH0(+)
[2]
CH1(+)
[3]
CH2(+)
[4]
CH3(+)
[5]
CH4(+)
[6]
CH5(+)
[7]
CH6(+)
[8]
CH7(+)
[9]
24V DC+
[10]
CH0(-)
[11]
CH1(-)
[12]
CH2(-)
[13]
CH3(-)
[14]
CH4(-)
[15]
CH5(-)
[16]
CH6(-)
[17]
CH7(-)
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
[11]
[12]
[13]
[14]
[15]
[16]
[17]
[18]
Screw for
fixing
[18]
24V DC-
Internal
power
circuit
Thermocouple
CH0(+)
CH0(-)
CH1(+)
CH1(-)
24V DC +
24V DC -
CH7(+)
CH7(-)
Intern
al
ci
rcuit
Use a shield cable.
Class D grounding
Thermocouple
Thermocouple
