Winland TempAlert MTA-2 Dual High/Low Temp Alarm Sensor

The Winland MTA-2 Temp Alert is a mechanical temperature monitoring device designed to detect high and low temperature conditions in residential and commercial environments. Featuring two independently adjustable temperature alarm limits, separate normally open dry-contact outputs, and a 20 F to 110 F alarm operating range, it connects to compatible hardwired or wireless security alarm systems. The MTA-2 operates without batteries or external power and provides 3 F temperature accuracy, 12 VDC/50 mA contact ratings, and an analog temperature display for monitoring environmental conditions in non-condensing indoor locations.

Winland MTA-2 TempAlert Mechanical High/Low Temperature Monitor with Dual Alarm Outputs

The Winland MTA-2 Temp Alert Mechanical Temperature Monitor provides adjustable high- and low-temperature alarm detection for residential properties, commercial buildings, server rooms, greenhouses, and unattended facilities. Manufactured by Winland Electronics, the MTA-2 uses a mechanical bimetallic temperature-sensing mechanism with separate high- and low-temperature alarm outputs to identify environmental conditions outside user-selected limits. When the surrounding temperature reaches either configured threshold, the corresponding normally open contact closes and signals a compatible security alarm panel or connected notification system. The device also includes an analog temperature display with Fahrenheit and Celsius markings, allowing occupants and maintenance personnel to check ambient temperature directly. Its mechanical operation requires no batteries, dedicated power supply, or electronic programming, making it suitable for continuous temperature supervision in protected indoor environments.

The MTA-2 supports temperature alarm monitoring from 20 F to 110 F (-6.7 C to 43.3 C), with an analog display range of 0 F to 120 F (-17.8 C to 48.9 C). The low-temperature alarm threshold can be adjusted between 20 F and 100 F, while the high-temperature threshold can be adjusted between 30 F and 110 F. Winland recommends maintaining at least 10 F (5.6 C) between the high and low setpoints to establish a suitable monitoring window. The mechanical bimetallic coil provides a specified temperature accuracy of 3 F ( 1.7 C) and a temperature response time constant of approximately 14 minutes. Two independent gold-plated, normally open dry-contact outputs rated at 12 VDC and 50 mA allow separate alarm reporting for excessive heat and low-temperature conditions. These contacts are intended for low-voltage signaling circuits and are not rated for switching high-voltage equipment.

The Winland MTA-2 features a surface-mounted ABS plastic enclosure measuring 4.5 inches high by 3.25 inches wide by 1 inch deep (114 x 83 x 25 mm). Weighing approximately 6 ounces (170 grams), the monitor installs on a suitable vertical wall or mounting surface using its key-slot mounting arrangement and included hardware. The package contains one MTA-2 temperature monitor, two mounting screws, two wall anchors, and a product guide. Installation requires connecting the appropriate alarm output terminals to compatible security panel inputs using suitable low-voltage wiring, with Winland recommending 18-22 AWG twisted-pair conductors. The adjustable temperature limits are set mechanically using movable limit posts secured by locknuts. For accurate ambient temperature monitoring, Winland recommends mounting the device away from windows, exterior doors, direct heat sources, and ventilation conditions that could distort temperature readings. The unit must be installed in a non-condensing indoor environment and is not intended for direct installation inside refrigerators, freezers, or coolers.

The MTA-2 integrates with compatible hardwired intrusion alarm panels, wireless alarm transmitters, and monitoring equipment accepting normally open dry-contact inputs. Its independent high- and low-temperature outputs allow installers to configure separate alarm zones for overheating and low-temperature conditions, supporting applications such as heating system failure notification, equipment room monitoring, and protection of unattended buildings against temperature extremes. Unlike the Winland TA-40, which provides a fixed low-temperature alarm threshold of approximately 39.5 F, the MTA-2 offers adjustable thresholds for both high- and low-temperature monitoring. More specialized Winland EnviroAlert and EnviroAlert Professional systems support remote wired sensors for applications requiring monitoring inside refrigerated or freezing environments. The MTA-2 is identified by manufacturer part number M-001-0151 and carries a one-year limited manufacturer warranty. Winland recommends testing the device weekly to verify correct alarm activation and connected system response. The MTA-2 does not independently transmit notifications, sound an alarm, or provide cloud monitoring; these functions require compatible external monitoring equipment.