The TD250 range is a dual channel detector with advanced “logic” features. These include direction sensing and delay / extend timing for queue detection and traffic phase extensions.
The TD250L has programmable speed / vehicle headway thresholds for controlling “too fast / too close” warning signs.
879FT0014 - TD252 - 240V AC
879FT0016 - TD250L - 240V AC
Self tuning range: 20-1500μH
Sensitivity: Four step adjustable on face-plate
High: 0.02% ΔL/L
Medium High: 0.05% ΔL/L
Medium Low: 0.1% ΔL/L
Low: 0.5% ΔL/L
Frequency: Four step adjustable on face plate. 12- 80kHz (frequency determined by loop geometry)
Output Configuration: 2 output relays
Relay 1 – Presence Output or Direction (A – B) option.
Relay 2 -TD250 model: Presence output or Direction (B -A) option. TD250L model: Speed logic / Headway logic Output
Response time: Turn on / turn off is 60ms.
Presence time: Presence selection on faceplate
40 minutes or indefinite (Approx. 1hour for 3% DL/L)
Operating mode: Mode selection on faceplate
1 Normal presence both channels
2 Direction logic both channels
3 Delay / Extend modes
4 Speed / Headway modes
Indications: The following face-plate indications are provided
1 Red Power /Diagnostic Loop
1 Tri-colour LED per channel
Green – detect
Red – fault
Orange – indicates speed/ headway
Protection: Loop isolation transformer, zener diode clamping on loop inputs and gas discharge tube protection.
Power Requirements: 240V AC ± 15% 48-60Hz (3VA max@230V)
Output relays and ratings: 1A@230V AC – Change-over contacts (fail-safe)
Fault relay: 1A@230V AC – Normally open contacts.
Operating temperature range: -40ºC to +80ºC
Material: High heat ABS blend
Dimensions: 113mm (high) x 57mm (wide) x 131 mm (deep)
Mounting: Shelf mount
Connector: Dual rear mount 11-pin submagnal (86CP11)