Humidity Controllers | McMaster-Carr

	Voltage Voltage

	Relative Humidity Accuracy Relative Humidity Accuracy

±5%

±1%

	Wire Connection Type Wire Connection Type

Screw Terminals

Wire Leads

Screw-Clamp Terminals

	For Use With For Use With

Humidifiers

Heaters

Dehumidifiers

	Mounting Location Mounting Location

	Electrical Connection Type Electrical Connection Type

Hardwire

Plug

	Actuation Point Adjustability Actuation Point Adjustability

Adjustable

Nonadjustable

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Overall Height Overall Height

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Relative Humidity Relative Humidity

	Width Width

	For Area For Area

	Overall Width Overall Width

	Overall Depth Overall Depth

	Housing Material Housing Material

	Desiccant Material Desiccant Material

Silica Gel

Aluminosilicate

	Desiccant Type Desiccant Type

Bag

Canister

	Specifications Met Specifications Met

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	Maximum Operating Temperature Maximum Operating Temperature

122° F

158° F

	Current Current

	Removal Capacity Removal Capacity

Up to 32% of desiccant
weight

Up to 30% of desiccant
weight

Up to 22% of desiccant
weight

Up to 25% of desiccant
weight

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55 Products

Panel-Mount Humidity Controllers

The sensor monitors relative humidity and triggers the controller to turn equipment on or off. Sensor and controller are sold separately.

Controller is SPDT (single pole, double throw). It can be set to turn one circuit from off to on (normally open) or from on to off (normally closed). Set the actuation point with the keypad.

Sensor

Relative Humidity
Range	Accuracy	Max. Operating Temp., °F	Wire Connection Type	Wire Lead Lg.	Cable Lg., ft.	Ht.	Wd.	Housing Material	Fasteners Included		Each
20% to 90%	±5%	122°	Wire Leads	1/16"	4	2 3/8"	31/32"	Plastic	No	00000000	000000

Controller

Relative Humidity			For Panel Cutout		No. of
Range	Accuracy	Max. Operating Temp., °F	Ht.	Wd.	Actuation Points	Circuits Controlled	Wire Connection Type	Voltage	Ht.	Wd.	Dp.	Housing Material		Each
10% to 100%	±1%	158°	1 9/64"	2 13/16"	2	1	Screw Terminals	120V AC	1 11/32"	3"	2 3/8"	Plastic	00000000	0000000

Enclosure Humidistats

Nonadjustable

Adjustable

Reduce the humidity in your enclosure to prevent condensation that can cause corrosion and short circuits. These humidistats switch your heater on when the enclosure reaches the relative humidity setting. Once the humidity falls by 5%, the heater switches off. To install, clip humidistats to a DIN rail.

Nonadjustable humidistats work for most applications. They keep humidity below 65%, which is when condensation is most likely to form. Since they aren’t adjustable, the humidity setting can’t be tampered with or accidentally changed. For critical components, use adjustable humidistats to set the relative humidity you need in your enclosure. Use a lower humidity setting in damp environments and places with frequent temperature changes. Condensation is more likely in these situations.

CSA Certified, CSA-US Certified, CE Marked, and VDE Certified, these humidistats meet American, Canadian, and European safety standards. They also meet UL 94 V-0, so if they catch fire, they self-extinguish within 10 seconds and won’t spread the fire by dripping.

Relative Humidity						Overall
Setting	Difference	Tolerance	Voltage	Current, A	For DIN Rail Height, mm	Height	Width	Depth	Environmental Rating	Specifications Met		Each
Nonadjustable
65%	5%	±1%	120V AC	16	35	2 1/2"	1 5/8"	1 1/2"	IP20	CE Marked; VDE Certified; CSA Certified; CSA-US Certified; UL 94 V-0	0000000	000000
65%	5%	±1%	240V AC	16	35	2 1/2"	1 5/8"	1 1/2"	IP20	CE Marked; VDE Certified; CSA Certified; CSA-US Certified; UL 94 V-0	0000000	00000
Adjustable
40% to 90%	5%	±1%	120V AC	16	35	2 1/2"	1 5/8"	1 1/2"	IP20	CE Marked; VDE Certified; CSA Certified; CSA-US Certified; UL 94 V-0	0000000	00000
40% to 90%	5%	±1%	240V AC	16	35	2 1/2"	1 5/8"	1 1/2"	IP20	CE Marked; VDE Certified; CSA Certified; CSA-US Certified; UL 94 V-0	0000000	00000

Humidistats

For Humidifiers

For Humidifiers and Dehumidifiers

Turn the dial to control humidity equipment.

Humidistats for humidifiers and dehumidifiers mount to a surface-mount outlet box.

					Overall
Voltage	Current	Relative Humidity	Switch Type	Color	Ht.	Wd.	Dp.	Mounting Location	Mounting Fasteners Included		Each
For Humidifiers
24V AC-30V AC	1A	10-75%	SPDT	White	3"	4 3/4"	1 3/4"	Duct, Wall	Yes	0000000	000000
For Humidifiers and Dehumidifiers
120V AC/208V AC/240V AC	6A/3.5A/3A	0-70%	SPDT	Beige	4 3/4"	3"	3"	Outlet Box	Yes	0000000	000000

Humidifiers

Connect this humidifier to a water supply, and an electrical heater boils water to generate steam. This humidifier releases humidity directly into a room or connects to a duct.

		Overall			For Duct		For Water Supply Line Tubing
Output Capacity, gal./day	For Area, cu. ft.	Ht.	Wd.	Dp.	Wd.	Ht.	Size	Material	Housing Material	Voltage	Current	Plug Type	Cord Lg., ft.	Mounting Hardware Included	Specifications Met		Each
13	11,300	19"	13"	18 1/2"	12"	12"	1/4"	Copper	Stainless Steel	120V AC	14A	Three Prong	5	Yes	UL Listed	0000000	000000000

Duct-Mount Humidifiers

Attach to your forced-air system return duct or mount through a wall to release humidity directly into a room. This humidifier spins water at high speeds to produce a fine atomized mist that rapidly evaporates.

		Overall		For Water Supply Line Tubing
Output Capacity, gal./day	For Area, cu. ft.	Dia.	Ht.	Size	Material	Drain Tubing ID	Housing Material	Electrical Connection Type	Voltage	Current	Mounting Hardware Included		Each
6	7,000	10 1/2"	12"	1/4"	Copper	1/2"	Plastic	Hardwire	120V AC	0.4A	Yes	0000000	0000000

Wall-Mount Humidifiers

Connect this humidifier to a water supply, and an electrical heater boils water to generate steam. A built-in blower distributes humidity directly into a room.

Requires a humidistat (not included).

		Overall			For Water Supply Line Tubing		Housing
Output Capacity	For Area	Ht.	Wd.	Dp.	Size	Material	Material	Color	Electrical Connection Type	Current	Specifications Met		Each
11.5 gal./day @ 120 V AC 23 gal./day@ 208 V AC to 240 V AC	16,000 cu. ft. @ 120 V AC 32,000 cu. ft. @ 208 V AC to 240 V AC	21 3/8"	11 3/8"	6 7/8"	1/4"	Copper	Plastic	Gray, White	Hardwire	12.7A	UL Listed	0000000	000000000

Required Humidistat	0000000	Each	0000000
Replacement Residue Collector	0000000	Each	000000

Large-Space Office Humidifiers

With an output capacity that's six times the output of our standard office humidifiers, this humidifier adds cool moisture to the air in a larger area. Fill the reservoir with water as necessary to reach daily output.

			Overall
Output Capacity, gal./day	For Area, cu. ft.	Reservoir Capacity, gal.	Ht.	Wd.	Dp.	Housing Material	Voltage	Current	Plug Type	Cord Lg., ft.	Specifications Met		Each
12	21,600	3 1/2	20 1/2"	21 1/2"	14 1/2"	Plastic	120 V AC	0.8A	Two Prong	5	ETL Listed	0000000	0000000

Bacteria Treatment (32-fl. oz. Jug) — Cannot be sold to AL, FL, HI, MS, Outside United States	0000000	Each	00000
Replacement Filter	0000000	Each	00000

Office Humidifiers

Add fine moisture to the air. Fill the reservoir with water as necessary to reach daily output.

			Overall
Output Capacity, gal./day	For Area, cu. ft.	Reservoir Capacity, gal.	Ht.	Wd.	Dp.	Housing Material	Voltage	Current	Plug Type	Cord Lg., ft.	Specifications Met		Each
2	6,000	1 1/4	12 1/2"	9 1/2"	10"	Plastic	120V AC	0.3A	Two Prong	5	ETL Listed	0000000	000000

Dehumidifying Cabinets

Store and protect 3D printer filaments, optical equipment, and other sensitive material in a humidity-controlled environment. Also known as dry boxes and desiccator cabinets, these cabinets prevent moisture-sensitive 3D printer filaments, such as nylon, ABS, and polycarbonate, from becoming brittle, discolored, or broken. They also keep sensitive electrical and optical equipment, such as microscopes and lenses, free from mold and fungus. Their moisture-absorbing desiccants recharge automatically, so you don't have to remember to charge them yourself or worry about the humidity rising unintentionally.

Standard cabinets are sized to store small equipment, such as flasks and lenses, as well as small filament spools. The desiccants recharge every 20 minutes to keep relative humidity below 30%. Although you cannot set the humidity to a specific level, a humidity meter on the door lets you check the reading.

Designed with 3D printing in mind, cabinets with filament feed ports are large enough to hold up to four 12"-dia. filament spools. They also have four filament feed ports, so you can keep filament dry while still feeding a printer, ensuring the filament doesn't go bad in the middle of a longer job. These cabinets can lower relative humidity to less than 20%; set and monitor the level using the analog display.

Standard Cabinets

Standard

Overall				Shelf
Ht.	Wd.	Dp.	Cap., lbs.	Type (No. of)	Cap., lbs.	Ctr.-to-Ctr. Adjustments	Relative Humidity	Desiccant Material	Material	Plug Type	Cord Lg., ft.		Each
Assembled
12 1/2"	13 1/2"	16 1/2"	80	Adjustable (2)	40	4"	<30%	Silica Gel	Plastic	Two Prong	8	0000000	000000000
20 1/2"	13 1/2"	16 1/2"	120	Adjustable (3)	40	4"	<30%	Silica Gel	Plastic	Two Prong	8	0000000	00000000

Cabinets with Filament Feed Ports

Filament Feed Ports

With Filament Feed Ports

Overall				Shelf
Ht.	Wd.	Dp.	Cap.	Type (No. of)	Cap.	Ctr.-to-Ctr. Adjustments	Relative Humidity	Desiccant Material	For Filament Dia., mm	Material	Window Material	Plug Type	Cord Lg., ft.	Features		Each
Assembled
21 7/8"	15 3/4"	16"	Not Rated	Adjustable (1)	Not Rated	1"	<20%	Aluminosilicate	1.75-4.76	Painted Steel	Glass	Two Prong	6	Analog Humidity Control and Display	0000000	0000000

Dehumidifiers

8 gal./day Removal Capacity

13 gal./day Removal Capacity

Use for more demanding jobs such as water damage restoration work.

Removal capacity is based on 80° F and 60% relative humidity.

	Overall									Drain Hose
Removal Capacity, gal./day	Ht.	Wd.	Dp.	Housing Material	No. of Speeds	Voltage	Current	Plug Type	Cord Lg., ft.	Included	Lg., ft.	Temp. Range, °F	Specifications Met		Each
8	29"	20"	19 1/2"	Plastic	One	120V AC	6.4A	Three Prong	25	Yes	40	35° to 100°	UL Listed	0000000	000000000
13	44"	25"	22"	Powder-Coated Steel	Two	120V AC	8A	Three Prong	25	Yes	25	35° to 105°	__	0000000	00000000

Replacement Filters for 8 gal./day Removal Capacity

0000000

Each

000000

Rechargeable Small-Space Dehumidifiers

Place these dehumidifiers in small spaces to protect moisture-sensitive materials such as photo lenses or 3D printing filaments. They absorb moisture with a silica gel that changes color, letting you know when they’re saturated. While they don’t need a battery or power cord during use, you do plug them in to dry them out—unlike other desiccants, they don’t require an oven.

						Reactivation
For Area, cu. ft.	Removal Capacity	Lg.	Wd.	Dp.	Wt., oz.	Method	Time, hrs.	Housing Material	Plug Type		Each
Silica Gel
333	Up to 25% of desiccant weight	6 1/4"	4 3/4"	1 1/4"	24	Plug In	12	Plastic	Two Prong	000000	000000
500	Up to 22% of desiccant weight	8"	5 1/2"	2 1/2"	35	Plug In	15	Plastic	Two Prong	000000	00000

Office Dehumidifiers

A reservoir collects moisture from the air. Empty the reservoir when full or drain directly through a garden hose.

Removal capacity is based on 65° F and 60% relative humidity.

Dehumidifiers cannot be sold to the listed areas due to chemical regulations.

		Overall									Drain Hose
Removal Capacity, gal./day	Reservoir Capacity, gal.	Ht.	Wd.	Dp.	Housing Material	No. of Speeds	Voltage	Current	Plug Type	Cord Lg., ft.	Included	Connection Size	Temp. Range, °F	Specifications Met	Cannot Be Sold To		Each
2 3/4	3/4	19 11/16"	15 3/16"	10 1/4"	Plastic	Two	120V AC	2.2A	Three Prong	6	No	3/4	41° to 90°	C-UL Listed, UL Listed	CA	0000000	0000000
4 1/2	1 1/2	24 1/4"	15 7/16"	11 1/8"	Plastic	Two	120V AC	3.3A	Three Prong	6	No	3/4	41° to 90°	C-UL Listed, UL Listed	CA	0000000	000000
6	1 1/2	24 1/4"	15 7/16"	11 1/8"	Plastic	Two	120V AC	4.8A	Three Prong	6	No	3/4	41° to 90°	C-UL Listed, UL Listed	CA	0000000	000000

Small-Space Office Dehumidifiers

Warm the air in small rooms to reduce humidity.

For Area, cu. ft.	Overall Wd.	Housing Material	Voltage	Current	Plug Type	Cord Lg., ft.	Specifications Met	Mounting Hardware Included		Each
95	18"	Aluminum	120V AC	0.1 A	Two Prong	10	UL Listed	Yes	0000000	000000
130	24"	Aluminum	120V AC	0.1 A	Two Prong	10	UL Listed	Yes	0000000	00000
190	36"	Aluminum	120V AC	0.2 A	Two Prong	10	UL Listed	Yes	0000000	00000
320	48"	Aluminum	120V AC	0.3 A	Two Prong	10	UL Listed	Yes	0000000	00000

Desiccant Bags

Remove moisture from sealed containers during shipping and storage.

These desiccants are best when relative humidity is at least 40%. The area covered is calculated at 77° F and 40% relative humidity.

						Small Pack			Large Pack
For Area, cu. in.	Removal Capacity	Lg.	Wd.	Wt., oz.	Bag Material	Pkg. Qty.		Pkg.	Pkg. Qty.		Pkg.
Silica Gel
6	Up to 32% of desiccant weight	1 3/8"	3/4"	0.04	Tyvek	10	0000000	00000	1,000	0000000	000000
24	Up to 32% of desiccant weight	1 3/4"	1"	0.11	Tyvek	10	0000000	0000	400	0000000	00000
235	Up to 32% of desiccant weight	2 3/4"	1"	0.21	Tyvek	10	0000000	0000	250	0000000	00000
1,425	Up to 32% of desiccant weight	6"	1 1/2"	1	Tyvek	5	0000000	0000	300	0000000	000000
2,850	Up to 32% of desiccant weight	6"	5"	2	Tyvek	5	0000000	00000	150	0000000	000000
5,700	Up to 32% of desiccant weight	7 1/8"	5"	4	Tyvek	2	0000000	00000	100	0000000	000000
11,425	Up to 32% of desiccant weight	8 1/2"	5"	8	Tyvek	2	0000000	00000	50	0000000	000000
22,850	Up to 32% of desiccant weight	9 1/4"	7 1/2"	16	Tyvek	1	0000000	00000	30	0000000	000000

Indicating Desiccant Bags

Know when it's time to change these desiccants—they turn from blue to pink after absorbing 8% of their weight. Use to remove moisture from sealed containers during shipping and storage.

These desiccants are best when relative humidity is at least 40%. The area covered is calculated at 77° F and 40% relative humidity.

The bags have a monitoring window to check for desiccant color change.

						Small Pack			Large Pack
For Area, cu. in.	Removal Capacity	Lg.	Wd.	Wt., oz.	Bag Material	Pkg. Qty.		Pkg.	Pkg. Qty.		Pkg.
Silica Gel
6	Up to 30% of desiccant weight	1 3/8"	7/8"	0.04	Tyvek	10	0000000	00000	1,000	0000000	0000000
18	Up to 30% of desiccant weight	1 3/4"	1"	0.11	Tyvek	10	0000000	0000	400	0000000	00000
36	Up to 30% of desiccant weight	2 5/8"	1"	0.21	Tyvek	10	0000000	0000	300	0000000	00000
85	Up to 30% of desiccant weight	3 1/8"	1 1/2"	0.5	Tyvek	10	0000000	00000	115	0000000	00000