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  • IMAGE® 110V Digital Air Humidity Control Controller WH8040 Range 1%~99% RH HM-40 Type
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IMAGE® 110V Digital Air Humidity Control Controller WH8040 Range 1%~99% RH HM-40 Type

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List Price: $59.99
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  • Humidity Measuring Range: 1% ~ 99% RH, Humidity controlling range: 1% ~ 99% RH, Humidity Measuring Error: 3%.
  • Resolution: 1% RH; Sensor Type: HM-40. Power Suppler: AC 110V. Current: MAX 200MA. Data retention: YES. Temperature compensation: YES. Data Retention: YES.
  • Power consumption: < 3W, Max 200mA. Relay contact current: AC 5A/110V. Working temperature: 0°C - 50 °C. Storage temperature: -10°C - 60 °C. Size(L x W x H): Approx. 83 x 75 x 33cm. Probe size(D x L): Approx. 4 x 20mm.
  • Functions: Function of humidification and humidification, Hysteresis function, Humidity correction, Delay protection, Function of Upper and Lower limit.
  • Package Include: 1 x Humidity controller WH8040, 1 x Temperature sensor probe with cable
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Frequently Bought Together

IMAGE® 110V Digital Air Humidity Control Controller WH8040 Range 1%~99% RH HM-40 Type + Elitech 110V All-Purpose Temperature Controller+ Sensor 2 Relay Output Thermostat Stc-1000 + 10 Pcs US 3 Pins Power Socket Plug Black AC 125V 15A
Price for all three: $47.40

These items are shipped from and sold by different sellers.

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Product Information

Technical Details
Item Weight8 ounces
Product Dimensions4.4 x 3.3 x 1.8 inches
  
Additional Information
ASINB009VY1ANM
Best Sellers Rank #8,837 in Home Improvement (See top 100)
Shipping Weight8 ounces (View shipping rates and policies)
Date First AvailableOctober 24, 2012
  
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Product Description

This digital humidity control controller WH8040 is with wide humidity measuring range and controlling range, comes with a humidity controller sensor probe with cable and a temperature sensor probe with cable. Humidity measuring range is 1% ~ 99% RH and control range is 1% ~ 99% RH.

Key notes:
RST: Press key RST to switch satrting up and power off, on the condition of power off, it can start up when press key RST, on the condition of starting up, it can power off when press and hold the key RST for three seconds.
SET: Press key SET to enter settings of humidity control, and press key ? or ? to adjust. Press and hold key ? or ? for three seconds to enter the fast adjust mode. Press key SET again to exit setting mode.

IMAGE® - is a registered trademark protected by the US Trademark Law. IMAGE® products are sold by authorized sellers only


Customer Questions & Answers

Customer Reviews

4.5 out of 5 stars
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See all 21 customer reviews
This little device seems to work very well.
D. Ainsworth
You do need to be a little savvy with electrical wiring, but, I did not find it difficult to set up.
Jubal Harshaw
Controller sensor was calibrated using a 75.5 % humipak and is within 0.5% accurate at 68F.
Dual-500

Most Helpful Customer Reviews

10 of 10 people found the following review helpful By D. Ainsworth on July 9, 2013
Verified Purchase
This little device seems to work very well. It is smaller than I had imagined it to be. It does exactly what it says it does and is configurable so that you can set a certain rH as well as a range that it can fall to (or rise to) before the relay kicks on. This helps to keep the relay from kicking on and off every few seconds. It also has a delay feature that would accomplish the same thing I assume, but I have not tried it. It seems accurate, maybe 3 or 4% below my cheap digital hygrometer, but it is calibratable +-5%. It can be set to humidify or dehumidify.

The only difficult thing is hooking it up; you need a 110v power cord hooked into the rear screw terminals to power it. To hook up a device your best bet is to make a small enclosure and put an electrical outlet and the humidistat into it, wire the white wire of a power cable to the outlet and the black wire to one side of the relay terminal then the other side of the relay to the outlet. This is assuming that you are using an appliance with a standard 110v appliance.

I use this for mycology but it would work well for terrariums or attics/crawlspaces too.
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4 of 4 people found the following review helpful By T man on December 30, 2012
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Does exactly what is supposed to do .. Great price . I use it in an incubator for dry Cure sausage and salami
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3 of 3 people found the following review helpful By James on February 6, 2014
Verified Purchase
This device appears to work well and is within a few % within other RH sensors, but one very odd feature (firmware bug, really) is that when used in humidify mode in an environment with 0% RH, the device goes into a state not described by the manual and shuts the relay off. "EEE" is displayed on the screen in this state. As soon as you place the probes in an area with some level of humidity (breathing on it works well), the relay clicks and the device works as expected. Unfortunately the behavior in "EEE" mode is the exact opposite of what it should be doing! Quite frustrating.
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2 of 2 people found the following review helpful By Jubal Harshaw on November 23, 2013
Verified Purchase
This works just as described. I am using it in my greenhouse with my orchids. You do need to be a little savvy with electrical wiring, but, I did not find it difficult to set up. I was able to get a box type enclosure and associated wiring and parts for about 50 or 60 dollars total. I was unable to find a digital humidistat anywhere for this price with most being several hundred dollars. My unit appears to be dead on for humidity. I attribute this to its' temperature compensation feature; something absent from analogue units. The hysteresis setting is great too. This is a versatile unit!
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1 of 1 people found the following review helpful By S. Parler on June 11, 2014
Verified Purchase
I am an old electrical engineer with a basement that requires occasional dehumidification. My dehumidifier nameplates at 8.5 amps, and does a great job except that it is fail-sauce for turn-on and turn-off times. Enter the WH8040. Its relay is only rated 5 amps, but combined with a 10-amp 250VAC slow-blow ceramic-housing fuse, an inline fuse holder, a power connector, a #16 AWG (13 amp) power cord, a BUD CU-347 aluminum enclosure and an "SSA-25 AA" Chao He solid state relay we can fabricate a nice little controller. All of these items are available at Amazon. It's best to add an aluminum heatsink of at least 30 in˛ to the outside of the enclosure then prime all with self-etching primer (Amazon or local auto parts store) and spray paint the color of your choice. I used flat black. If you don't paint, the radiative emissivity is pretty low for most unanodized aluminum. So paint and radiate!

The result of the assembly is awesome. Should pay for itself in less than 6 months of wasted electricity and wear on the dehumidifier that often gets stuck in the ON state and never turns off, even at 40% RH.

The controller comes with instructions and is a breeze to program for setpoint and hysteresis. A very useful built-in feature is its temperature compensation, which corrects for the inevitable air heating from the power dissipation of the dehumidifier. If the controller didn't have temperature compensation, this heating would mislead it into turning off early due to artificial drop of the RH from temperature increase. This is perhaps associated with the difficulty in getting the original dehumidifier to cut on and off properly.

Best of luck to you fellow hobbyists!
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1 of 1 people found the following review helpful By shane bustin on December 30, 2013
Verified Purchase
I have used this in combination with the STC1000 to control heat and humidity. This unit controls the exhaust fan when humidity reaches a certain point. It comes with the sensors although I wish the cables were longer. I made a custom faceplate out of an outlet cover to mount this in. Easy to configure and use.
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1 of 1 people found the following review helpful By Jacob Rehmann on August 14, 2013
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Great Buy, exactly what I needed to measure relative humidity very rapidly, will order more when I need them for my dryers!
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1 of 1 people found the following review helpful By dp on February 17, 2013
Verified Purchase
Hooked it up and it seems to work as described. It's measured value in the 65-75% range agrees with the reading from my room dehumidifier but reads 8-10% higher than the hygrometer in my weather station. Been using it for the last couple weeks hooked up to an electrostatic humidifier and so far so good.
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