One of the most critical components of the whole vehicle access control system is the inductive loop detector. Nortech’s detectors have been renowned for their reliability and durability for over many years.
Dual channel loop detectors are used to identify the presence of vehicles by means of two independent inductive loops buried under the road and can be used in almost any application. Detectors are available in both boxed and PCB format.
Nortech’s dual channel detectors can be used as an alternative to two single channel detectors to eliminate any presence of crosstalk. They also feature A-B logic to detect the direct of vehicles crossing the loops.
All detectors are CE tested and approved. A compact detector diagnostic unit is available for extracting data from new and existing sites.
Features
- Compact size
- Flexibility – User selectable functions
- Diagnostic capabilities (when used with a DU100)
- Selectable permanent presence (to eliminate premature barrier/gate closure)
- Loop isolation protection
- Loop frequency indication (to eliminate interference with adjacent loops)
- Automatic sensitivity boost (ASB) – for reliable detection of high-bed vehicles (e.g. lorries)
- A-B Logic – for different outputs depending on the vehicle direction
- Visual fault monitor
Product Codes
- PD231 - 110V AC, boxed
- PD232 - 230V AC, boxed
- PD234 - 12-24V AC/DC, boxed
- PD239 - 24V DC, PCB Style
- PD243 – 230V AC, 2 relays per channel
Specifications
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PD230 |
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Self-tuning range: |
20-1000μH |
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Sensitivity: |
4-step selectable per channel: |
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High: 0.02% Δ L/L |
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Medium High: 0.05% Δ L/L |
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Medium Low: 0.1% Δ L/L |
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Low: 0.5% Δ L/L |
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Frequency: |
4-step adjustable, 20-70kHz (frequency determined by loop geometry) |
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Output configuration: |
1 output relays per channel (fail-safe) |
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Fail secure (factory option) |
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Pulse output duration: |
Approx. 150ms (factory option 250ms) |
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Presence time: |
Selectable: limited or permanent |
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Limited: presence 1 hour for 3% Δ L/L |
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Protection: |
Loop isolation transformer, zener diode clamping on loop inputs and gas discharge tube protection |
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Power requirements: |
120V AC +/- 15% 48-60Hz (PD231) |
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230V AC +/- 15% 48-60Hz (PD232) |
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12-24V AC/DC +/- 15% (PD234) |
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Requirement: |
1.5VA max @ 230V |
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Output relays: |
5A @ 230V AC; N/O contact per channel (fail-safe) |
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Operating temp range: |
-40oC to +80oC |
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(circuit sealed against condensation) |
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Material: |
High heat ABS blend |
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Dimensions (mm): |
76 x 40 x 78 |
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Mounting: |
Shelf or DIN rail socket |
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Connector: |
Single rear-mount 11-pin submagnal (86CP11) |
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Option: |
1 metre flying lead |
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PD239 |
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As PD230 except for: |
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Self-tuning range: |
20-1500μH |
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Pulse output duration: |
Approx. 150ms |
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Presence time: |
1 hour for 3% Δ L/L permanent presence option |
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Power requirements: |
24V AC/DC +/- 15% |
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Requirement: |
1.1VA max @ 24V DC |
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Output relay: |
1A @ 230V AC; change-over contacts |
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Dimensions (mm): |
105 x 68 |
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Mounting: |
Panel or plug-in |
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Connector: |
Molex 14-pin female |
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Option: |
Flying lead |