Specifications

Siemens Mobility, Traffic Solutions
Sopers Lane, Poole, Dorset
BH17 7ER
Version 10 Page 18 of 120 Status Issued
Last Editor harry.smyth Date 03 November 2014
Document
Name
GENERAL HANDBOOK FOR HEIMDALL
DETECTORS
Doc. No. 667/HB/31900/000
Copyright  Siemens plc 2014 All Rights Reserved
3 General Specifications
3.1 Electrical Specifications
3.1.1 Operating Voltage
24V AC ± 20% (48 to 63 Hz)
or
10.8V to 28.8V DC
3.1.2 Detection Solid State Relay(s)
Voltage free output.
On Impedance 25ohms (typical), 35 ohms (maximum).
Open Circuit maintained up to 350V peak.
3.1.3 Operating Current
Detailed current requirements are dependent on detector type, and this information may
be found in the appropriate detector specification section (reference section 5).
3.1.4 Radio Frequency Transmission Specifications
Detector Variant
Frequency of
Operation
Detection
Technique
Max
EIRP
1
(dBmW)
Standard VA 24.15 – 24.25
CW 17.8
Single Lane VA 24.15 - 24.25
CW 18.6
Speed 24.15 - 24.25
CW 17.8
On Crossing 13.4 – 14.0
CW 10.2
Table 3-1 : Transmission Specifications for CW applications
Detector Variant
Frequency of
Operation
Detection
Technique
Sweep Rate
2
(MHz/mS)
Max EIRP
(dBmW)
Stopline 24.05 – 24.25
FMCW 13.17 18.0
SCOOT 24.05 - 24.25
FMCW 13.17 18.0
Kerbside 13.4 - 14.0
FMCW/CW 9.26 8.1
Table 3-2 : Transmission Specifications for FMCW applications
1
Measurement conditions: T
min
:0
o
C, T
max
:55
o
C, U
min
:19.2V, U
max
:28.8V
2
Sweep from F
L
to F
H