09-2018
file: ISAFE3-OperationManual_EN_DE.R4.VEXH.docx
18 of 58
Vallen ISAFE3 Operation Manual - Operation Manual
5.2.5
Electrical specifications of external intrinsically safe circuit
Connector type at SISO3 and ISAS3
side
Coaxial, SMA, female, 50 Ω
Connector type for cable end at
SISO3 side
(for use with HISO3 = right-angled,
gold plated)
SMA male, 50
Ω, Telegärtner
Art. No. J01150A0091
(Temp. and climate: IEC 60068 55/155/56)
Assembly instruction: Figure 11-2
Connector type for cable end at ISAS3
side (straight, stainless steel)
SMA male, 50
Ω, Huber+Suhner
Type 11_SMA-50-3-55/199_N
(specified to -65°C to +165°C, IP68)
Assembly instruction: Figure 11-1
Terminal block (test purposes only)
4 terminal screws,
4 = signal, 1
– 3 = shield (
Ex i
circuit),
Cable shield, ISAS3 side
Connected to metallic case of ISAS3
Cable shield, SISO3 side
Forms minus pole for voltage supply.
Output DC voltage, nominal
+12 V - 0.16 V/mA against cable shield
Output DC current, nominal,
13 mA (standby) / 20 mA (full scale) /
25 mA (fourfold saturated)
Output power (continuous, nominal)
300 mW (IS relevant)
AC input impedance of SISO3
50 Ω
AC output impedance of ISAS3
50 Ω
AC voltage range (full scale),
at 14/20/26 dB SISO3 gain
2 V
PP
@ 14 dB / 1 V
PP
@ 20 dB / 0.5 V
PP
@ 26 dB
AST-control pulse
Shortening intrinsically safe circuit for 0.5
– 5 µs by
SISO3 activates an ISAS3 internal pulse generating
an artificial AE event for test purposes.
(See ISAS3 specs for details)
Isolation voltage test SMA-shield
against BNC-shield
1500 V
RMS
for 60 s, each unit individually tested.
Module to be disconnected from DIN rail for this test
Resistance of shield to earth for
electrostatic discharge on SISO3 side
220 kΩ, 0.25 W to earth at DIN-rail
(0.125 W @ 60°C), (
165 V
max
).
Parameters of cable type for SISO3-
ISAS3-connection, not oil-proof
RG58C/U coaxial cab
le 50 Ω
C
C
< 100 pF/m,
L
C
< 0.34 µH/m
R
C
< 28 Ω/km (inner wire) + 14 Ω/km (shield)
Diameter: 5 mm
