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    Winland HA-4 Electronic Humidity Sensor — User Guide

    August 31, 2026 2 min read

    Installation, wiring, and specifications for the Winland HA-4 Electronic Humidity Sensor, used with Winland EnviroAlert monitoring devices.

    💾 Download Original PDF 🛒 View Product
    Full text manual (for reference)

    Overview

    The Winland HA-4 Electronic Humidity Sensor monitors remote-location ambient room humidity for rising or falling rates, designed to work with Winland's EnviroAlert® and EnviroAlert Professional® monitoring device families, including the EA200-12/24, EA400-12/24, EA800-IP, and EAPro-GTWY.

    Package Contents

    • 1x HA-4 sensor
    • 1x Mounting kit (2 screws, 2 anchors)
    • 1x Product guide

    Features

    • Monitors ambient humidity from 5–95% RH with ±3% accuracy between 25–75% RH
    • May be used in cooler/freezer environments
    • Maximum cable run of 1,000 ft. (304.8 m) using 18-22 AWG twisted pair

    Specifications

    Spec Value
    Power Requirements 12V DC or 24V DC, 0.21W max
    Sensing Element Capacitive / IC
    Sensing Range 5–95% RH at 77° F (25° C)
    Accuracy ±3% between 25–75% RH at 77° F (25° C)
    Response Time TC < 12 minutes
    Operating Temperature -40 to +140° F (-40 to +60° C), indoor use only
    Weight 5.3 oz (150.0 g)
    Dimensions 3.9" x 2.9" x 1.7" (9.9 x 7.4 x 4.3 cm)
    Mounting Surface mount
    Case Material ABS
    Environmental Rating Overvoltage Category OVC I, Pollution Degree 2, IP21

    Theory of Operation

    The HA-4 senses ambient room humidity electronically using a capacitive sensing element. Humidity varies room to room and even area to area within a room; ventilation and airflow greatly affect relative humidity. When first programming the HA-4 on the monitoring device, treat the initial reading as a baseline — allow at least 30 minutes of operation for the sensor to stabilize before setting high/low limits. A time delay is strongly recommended when programming the EA200-12/24, EA400-12/24, EA800-IP, or EAPro-GTWY to avoid false alarms from brief humidity spikes (e.g. a door opening or ventilation system starting).

    Installation

    • Flush-mount the sensor directly to a flat surface such as a wall
    • Locate away from drafts, heat sources, and direct sunlight
    • Recommended mounting height: 4 to 5 ft. (1.2 to 1.5 m) from the floor

    Wiring

    Wire the HA-4 to the EA200-12/24, EA400-12/24, EA800-IP, or EAPro-GTWY using 18-22 AWG twisted pair, extendable up to 1,000 ft. (304.8 m):

    • Red wire = Positive
    • Black wire = Negative
    • Blue wire = connects to the NEGATIVE (–) terminal on the sensor input of the desired monitoring device
    • The sensor input POSITIVE (+) terminal is not used

    Maintenance

    • Clean the outside of the HA-4 with a soft, dry cloth only — do NOT use liquid cleaners, solvents, abrasive cleaners, or compressed air
    • Do NOT open the product enclosure — doing so voids the warranty
    • Test the device weekly to ensure proper operation

    Warranty

    One (1) year limited warranty against defects in material and factory workmanship from date of purchase, when properly installed and operated per instructions. Requires a Return Material Authorization (RMA) from Winland for any returns. Does not cover misuse, negligence, accident, or unauthorized repair/alteration.

    Manufacturer

    Winland Electronics, Inc. Tech Support: 8:00am–5:00pm Central Time, (800) 635-4269 / (507) 625-7231, techsupport@winland.com, www.winland.com