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    Winland HA-4 Humidity Alert 4 Sensor — Specifications

    September 08, 2026 1 min read

    Product specification sheet for the Winland Electronic HA-4 (Humidity Alert 4) relative humidity sensor accessory for EnviroAlert monitoring consoles.

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    Full text manual (for reference)

    Product specification sheet for the Winland Electronic HA-4 (Humidity Alert 4) — a humidity sensor accessory for Winland EnviroAlert monitoring consoles.

    Overview

    The HA-4 (Model Number HA-4, Item Number M-001-0170) is a relative humidity sensor accessory compatible with several Winland EnviroAlert monitoring systems. It monitors ambient room humidity across a wide range and can be used in cooler or freezer environments.

    Compatible With

    • EnviroAlert Professional® Gateway (EAPro-GTWY)
    • EnviroAlert® 200 series (EA200-12 and EA200-24)
    • EnviroAlert® 400 series (EA400-12 and EA400-24)
    • EnviroAlert® 800-ip (Discontinued)

    Features

    • Monitors ambient room humidity from 5% to 95% RH, with accuracy of ±3.0% from 25% to 75% RH
    • May be used in cooler/freezer environments
    • Maximum cable run of 1,000' (304.8 m) using 18-22 AWG twisted pair
    • Consider pairing with Winland accessories Temp-S-K or 12VDCT for extended installations

    Specifications

    Sensor Humidity Range 5 to 95% RH at 77°F (25°C)
    Device Operating Temperature Range -40 to +140°F (-40 to +60°C)
    Power Requirements 12V DC, 0.21W max
    Sensing Element Capacitive / IC
    Response Time TC < 12 minutes
    Accuracy ±3% from 25 to 75% RH at 77°F (25°C)
    Dimensions 3.9" x 2.9" x 1.7" (9.9 x 7.4 x 4.3 cm)
    Weight 5.3 oz (150.0 g)
    Mounting Surface mount

    Manufacturer

    Winland Electronics — 424 North Riverfront Drive, Suite 200, Mankato, MN 56001. 800.635.4269. www.winland.com