TECHNICAL DATA. Nortech International (PTY) OW9PD130TD136

2. TECHNICAL DATA

2.1 Functional Data

Tuning

Self-tuning range

Sensitivity

Frequency

Relay Outputs

Presence Relay

Presence Time

Delay Time

Fault Output

Fully Automatic

20 to 1500 µH

Four step switch selectable

High 0.02 %

∆

L/L

Medium High 0.05 %

∆

L/L

Medium Low 0.10 %

∆

L/L

Low 0.50 %

∆

L/L

Four step switch selectable

Frequency dependent on loop size

Presence Relay

Fault Relay

Fail-safe

Switch selectable:

1 Second

4 Minutes

40 Minutes

No fixed time-out (dependant on inductance change) Approx.

1 hour for 3 %

∆

L/L

Switch selectable:

0 Seconds

10 Seconds

20 Seconds

30 Seconds

Separate fault monitor output relay

Operates under the following conditions:

1. Loop open/short circuit

2. Detector/power fault

Response Times

Drift Compensation Rate

Visual Indications

Reset

Surge protection

Turn – on 60 milliseconds

Turn – off 60 milliseconds

Approx. 1 %

∆

L/L per minute

1 X Power LED - Red

1 x Channel Status LED - Green

Reset by push button on front of enclosure

Loop isolation transformer, gas discharge tubes, and Zener

Diode clamping on loop input

301UM0031_01 TD136 Enhanced Vehicle Detector User Manual Page: 6 of 29