
ISOMETER® IR425-D4M(1C)
IR425-D4M(1C)_D00031_05_M _DEEN/ 04.2021 13
Messkreis
Messspannung Um............................................................. ±12 V
Messstrom Im(bei RF= 0 Ω)......................................... ≤ 200 µA
Innenwiderstand DC Ri................................................... ≥ 62 kΩ
Impedanz Zibei 50 Hz.................................................... ≥ 60 kΩ
Zulässige Fremdgleichspannung Ufg ......................... ≤ DC 300 V
Zulässige Netzableitkapazität Ce.................................... ≤ 20 µF
Anzeigen, Speicher
Anzeige..................... LC-Display, multifunktional, unbeleuchtet
Anzeigebereich Messwert...................................... 1 kΩ…1 MΩ
Betriebsmessabweichung (1…5 kΩ) .......................... ± 0,5 kΩ
Betriebsmessabweichung (5 kΩ…1 MΩ) ....................... ±15 %
Passwort ................................................................. off/0…999
Fehlerspeicher (Alarmrelais) ............................................ on/off
Eingänge
Leitungslänge externe Test-/Reset-Taste ........................≤ 10 m
Ausgänge, analog, galvanisch getrennt
Spannungsausgang ................................................. DC 0…10 V
Leerlaufspannung (offene Klemmen) ........................ ≤ DC 20 V
Bürde .............................................................................. ≥ 1 kΩ
Stromausgänge, kurzschlussfest:
Kurzschlussstrom ......................................................... ≤ 30 mA
Stromausgang ........................... DC 0/4…20 mA (0…20 mA)*
Bürde ............................................................................ ≤ 500 Ω
Stromausgang .................................................... DC 0…400 µA
Bürde ......................................................................... ≤ 12,5 kΩ
Umwelt/EMV
EMV ............................................................................ IEC 61326
Arbeitstemperatur ........................................... -25 ºC…+55 ºC
Klimaklassen nach IEC 60721:
Ortsfester Einsatz (IEC 60721-3-3) (ohne Betauung und
Eisbildung).......................................................................... 3K23
Transport (IEC 60721-3-2) (ohne Betauung und Eisbildung).......
.............................................................................................2K11
Langzeitlagerung (IEC 60721-3-1) (ohne Betauung und
Eisbildung).......................................................................... 1K22
Mechanische Beanspruchung nach IEC 60721:
Ortsfester Einsatz (IEC 60721-3-3) .................................... 3M11
Transport (IEC 60721-3-2) ................................................... 2M4
Langzeitlagerung (IEC 60721-3-1) .................................... 1M12
Anschluss........................................................ Schraubklemmen
Anschlussvermögen:
starr/flexibel/Leitergrößen AWG .................................................
.........................................0,2…4/0,2…2,5 mm2/AWG 24…12
Mehrleiteranschluss (2 Leiter gleichen Querschnitts):
starr/flexibel ...................................... 0,2…1,5/0,2…1,5 mm2
Abisolierlänge.................................................................... 8 mm
Anzugsdrehmoment............................................. 0,5…0,6 Nm
Anschluss.............................................................Federklemmen
Measuring circuit
Measuring voltage Um....................................................... ±12 V
Measuring current Im(at RF= 0 Ω)............................... ≤ 200 µA
Internal d.c. resistance Ri............................................... ≥ 62 kΩ
Internal impedance Zi(50 Hz)........................................ ≥ 60 kΩ
Admissible extraneous d.c. voltage Ufg ..................... ≤ DC 300 V
Admissible system leakage capacitance Ce..................... ≤ 20 µF
Displays, memory
Display................. LC display, multi-functional, non-illuminated
Display range, measuring value............................. 1 kΩ…1 MΩ
Operating error (1…5 kΩ) ........................................... ± 0.5 kΩ
Percentage operating error (5 kΩ…1 MΩ) ..................... ±15 %
Password ................................................................. off/0…999
Fault memory (alarm relay) ............................................. on/off
Inputs
Cable length external test/reset button ..........................≤ 10 m
Outputs, analogue, galvanic separated
Voltage output ........................................................ DC 0…10 V
Open-circuit voltage (open terminals) ....................... ≤ DC 20 V
Load ................................................................................ ≥ 1 kΩ
Current outputs, short-circuit proof:
Short-circuit current ..................................................... ≤ 30 mA
Current output .......................... DC 0/4…20 mA (0…20 mA)*
Load .............................................................................. ≤ 500 Ω
Current output ................................................... DC 0…400 µA
Load ........................................................................... ≤ 12.5 kΩ
Environment/EMC
EMC............................................................................. IEC 61326
Operating temperature .................................... -25 ºC…+55 ºC
Climatic categories acc. to IEC 60721:
Stationary use (IEC 60721-3-3) (except condensation and forma-
tion of ice)........................................................................... 3K23
Transport (IEC 60721-3-2) (except condensation and formation
of ice)...................................................................................2K11
Long-term storage (IEC 60721-3-1) (except condensation and
formation of ice)................................................................. 1K22
Classification of mechanical conditions acc. to IEC 60721:
Stationary use (IEC 60721-3-3) ......................................... 3M11
Transport (IEC 60721-3-2) ................................................... 2M4
Long-term storage (IEC 60721-3-1) .................................. 1M12
Connection......................................................... screw terminals
Connection properties:
rigid/flexible/conductor sizes AWG..............................................
.........................................0.2…4/0.2…2.5 mm2/AWG 24…12
Two conductors with the same cross section:
rigid/flexible ...................................... 0.2…1.5/0.2…1.5 mm2
Stripping length................................................................. 8 mm
Tightening torque, terminal screws...................... 0.5…0.6 Nm
Connection...................................................push-wire terminals