 SRA16C-1
Vehicle Loop Detector with GDT
The SRA16C-1
is a three terminal device, two of which are connected across
the signal inputs of the detector for differential mode protection,
and the third is grounded to protect against common mode damage.
Differential
mode surges (induced voltage across the loop detector input
terminals) are clamped by a semiconductor array instantly. The array
is designed to appear as very low capacitance to the detector.
Common mode
surges (induced voltage between the loop leads & ground) are
handled by a rugged three-element gas discharge tube which operates
(fires) at 90VDC and thereafter clamps the two loop leads to 30
volts in respect to ground. This design eliminates any ground noise
from entering the loop detector and being amplified. The SRA16C-1
is intended for all current detector models on the
market.
| SPECIFICATIONS |
| Operating
Voltage |
75 VDC |
| Clamping
Voltage |
90
VDC |
| Operating
Current |
NA |
| Peak
Surge Current |
10 kA |
| PD
Technology |
Gas
Discharge Tube |
| Connection
Type |
Wire
Leads |
| Operating
Temperature |
-40
C to +85 C |
| Dimensions
|
1"
Sq, Ht. 2" max |
| Mounting |
No.
10-32 x 3/8" stud |
| Weight |
3
oz |
|
| INSTALLATION |
|
Mounting
brackets are available for installing multiple units in
the controller cabinet. The brackets are capable of
mounting four or eight devices in-line. One SRA16C-1 is used for each loop detector to be protected.
Units
are installed as close as practical to the point where
the detector loop wires enter the controller cabinet.
Connect one of the flexible leads to each end of the
loop. The common (bolt) connection on each SRA16C-1
must be connected to earth ground.
Best
performance is obtained by (1) shortening the flexible
leads as much as possible, and (2) providing the lowest
possible impedance to ground.
|
| NOTE: The
SRA16C-1W/LEADS
(special order) is installed very similar to the
standard unit except the common (bolt) is
replaced with a green wire. |
|
|
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