7 Maintenance TMT182
30 Endress+Hauser
!
Note!
Guaranteed values for setting "high alarm" (≥ 21.0):
• Standard model: > 21.5 mA
• Advanced diagnostic model: > 22.5 mA
Source impedance max. (V
Power supply
- 11.5 V) / 0.022 A (current output)
e.g. (24 V-11.5 V)/0.022 A = 568.2 Ω
Transmission behavior Temperature linear, resistance linear, voltage linear
Filter 1st order digital filter: 0 to 100 s
Galvanic isolation U = 2 kV AC (input/output)
Input current required ≤ 3.5 mA
Current limit ≤ 23 mA
Switch on delay 4 s (during power up I
a
≤ 3.8 mA)
10.4 Power supply
Electrical connection See “Overview” on page 12.
Supply voltage U
b
= 11.5 to 35 V, polarity protected (For hazardous location please see control drawing)
#
Warning!
The unit must only be powered by a power supply that operates using an IEC 61010- 1 compliant
energy limited circuit: "SELV or Class 2 circuit".
Undervoltage detection Optional for 'Advanced Diagnostic' version.
If the supply voltage is not sufficient to output the output signal corresponding to the measured tem-
perature, a signal on alarm ≤ 3.6 mA is generated. After approx. 2 to 3 s, the system makes another
attempt to output the signal corresponding to the temperature.
Residual ripple Allowable ripple U
ss
≤ 3 V at U
b
≥ 13 V, f
max.
= 1 kHz
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