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Phone: +86 16626708626Description
3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Sensor Type | NTC thermistor, 10 kΩ at 77 °F (25 °C) |
| Quantity | Three independent sensors |
| Accuracy | ±0.2 °C at 25 °C (Beta = 3892) |
| Operating Range | −60 to 140 °F (−51 to 60 °C) |
| Terminals | Two separate terminals per sensor |
| Mounting | Fits tekmar Outdoor Sensor 070 enclosure |
| Dimensions | 2-1/8″ H × 9/16″ W × 9/16″ D (54 × 14 × 14 mm) |
| Application | Outdoor air temperature for multiple controls |
| Wiring | Independent wiring for each thermistor |
| Compatibility | tekmar control systems requiring outdoor sensors |
4. Product Introduction & Supply Chain Strategy
The tekmar 081 is a three-sensor outdoor temperature module that mounts inside a standard tekmar 070 enclosure. It supplies accurate outdoor air temperature data to multiple controls from a single exterior location, reducing the number of penetrations and simplifying multi-zone or multi-boiler installations.
Holding this module as New Surplus inventory protects Total Cost of Ownership on tekmar-based systems. Genuine new units eliminate the risk of drifted or failed thermistors that cause incorrect outdoor reset or weather-compensated control. For plants or buildings with multiple tekmar controllers, one or two units of buffer stock prevent extended downtime when an outdoor sensor fails.
5. Installation & Configuration Guide
Stage 1: Pre-Installation (Prep & Safety)
Isolate power to the associated tekmar controls. Photograph the existing outdoor sensor wiring and enclosure orientation. Confirm the replacement 081 is New Surplus and still in protective packaging. Prepare the 070 enclosure if installing a new assembly.
Stage 2: Removal
Open the outdoor sensor enclosure. Disconnect the three pairs of sensor wires, labeling each pair. Remove the old module carefully to avoid damaging the enclosure gasket or mounting hardware.
Stage 3: Installation (Clone & Seat)
Place the new 081 module into the 070 enclosure. Connect each thermistor pair to the corresponding terminals, matching the original wiring sequence. Ensure strain relief and gasket integrity. Close and seal the enclosure.
Stage 4: Power-On & Testing
Restore power to the controls. Verify each sensor reports a plausible outdoor temperature. Cross-check readings against a calibrated reference thermometer. Confirm the controls accept the outdoor temperature inputs and that outdoor-reset or weather-compensation functions operate correctly before returning the system to automatic service.
081
6. Firmware/Software Versions & Upgrade Notes
The 081 is a passive thermistor module with no firmware. Sensor characteristics are fixed by the NTC elements (10 kΩ at 25 °C, Beta 3892).
No software upgrade is required or possible. When replacing, ensure the host tekmar control is configured for a 10 kΩ outdoor sensor. Using a different curve or resistance value will produce incorrect outdoor temperature readings and improper control action. Document the control’s outdoor-sensor setting before and after the swap.
7. Frequently Asked Questions (FAQ)
Q: Is this truly New Surplus or refurbished?
A: Brand New Surplus only. Original packaging, unused thermistors, zero operating history.
Q: Why is the price higher than generic 10 kΩ sensors but lower than a full new OEM assembly?
A: Pricing reflects genuine tekmar-matched sensors secured as New Surplus. It avoids the calibration and reliability risk of unmatched third-party thermistors while remaining below current list for a complete outdoor sensor assembly.
Q: Is the 081 still in production?
A: It remains an active accessory for tekmar controls. Strategic buffer stock of one or two units is recommended for sites with multiple outdoor-sensor requirements.
Q: Can I install this without the 070 enclosure?
A: The module is designed specifically for the 070 enclosure to provide weather protection and proper thermal response. Installation outside the approved enclosure is not recommended.
Q: Will the new module match the temperature curve of the original?
A: Yes. It uses the same 10 kΩ NTC characteristic (Beta 3892) specified by tekmar. No control re-configuration is required if the original was a genuine 081 or equivalent.
Q: What warranty is provided?
A: Standard 1-year warranty against manufacturing defects. Serial or batch traceability is supplied with the unit.
Q: Do you support multi-site inventory or last-time-buy coordination?
A: Yes. For facilities running multiple tekmar systems we can consolidate New Surplus holdings to minimize carrying cost while protecting against outdoor-sensor failures.
