Hitachi EHV+ Series - Page 77

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(-)
Internal circuit
Use a shield cable.
Class D grounding
Thermocouple
Thermocouple