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Mattei MHD Series Desiccant Air Dryers
Externally Heated

100 to 3,000 SCFM
Mattei MHD Series are externally heated dryers ideal for providing clean, dry air to -40°F for process applications and where air lines are subject to icing from freezing temperatures. The Heater energy reduces the demand for purge air to 7% of rated capacity.

Mattei MHD Series with (EMS) are designed to prepare the offline desiccant tower for service, and then saving energy by managing the heater and purge air functions to minimize wasted energy.

Mattei MHD Series heated dryers uses an external heater to pre-heat the process purge air stream and uses about 7% of rated capacity to regenerate the offline bed.

Mattei’s Primary Blowdown System is standard on all MHD Series heat reactivated air dryers 1000 scfm and larger. It improves performance and efficiency while increasing desiccant life.
MTP Display
The Control Center is designed to accomodate Mattei’s optional Demand Controller.

The Demand Controller automatically adjusts energy use to actual moisture load. Moisture loading is affected by inlet temperature, pressure, relative humidity, and flow.

At $0.08 per KWH, the Demand Controller would save $6,730 annually when used with a 1000 scfm externally heated dryer operating at 75% load for 8,000 hours, at an average inlet temperature of +80°F (27°C). Digital dew point control provides for additional energy savings by allowing the operator to select higher dewpoints when appropriate. The moisture probe is contained in and protected by a rugged, stainless steel housing with a 80 micron sintered metal guard and a pressure rating of 3000 psi g.
Heatless Twin Tower - Standard Design
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   Model
SCFM
Heater kW
Air Connection
MHD-100-1.0NPT
100
1.5
1" NPT
MHD-135-1.0NPT
135
1.5
1" NPT
MHD-200-1.5NPT
200
3
1-1/2" NPT
MHD-250-1.5NPT
250
3
1-1/2" NPT
MHD-300-1.5NPT
300
4
1-1/2" NPT
MHD-400-2.0NPT
400
6
2" NPT
MHD-500-2.0NPT
500
6
2" NPT
MHD-600-2.0NPT
600
9
2" NPT
MHD-800-2.0NPT
800
9
2" NPT
MHD-1000-3FLG
1000
13
3" Flg
MHD-1200-3FLG
1200
13
3" Flg
MHD-1500-4FLG
1500
18
4" Flg
MHD-2000-4FLG
2000
25
4" Flg
MHD-2600-4FLG
2600
25
4" Flg
MHD-3000-6FLG
3000
30
6" Flg

*Scroll to the right on mobile to see entire chart
   Description
Flow Range @ 100 psi g
(7 bar g)
Dewpoint
Max Operating
Pressure
Min Operating
Pressure
Max Inlet
Temp
Min Inlet
Temp
Electrical
MHD-100 -
MHD-250
100-250 cfm
-40°F (-40°C)
Standard
-100°F (-70°C)
Optional
150 psi g
(10.3 bar g)
80 psi g
(5.5 bar g)
120°F
(49°C)
50°F
(10°C)
240V/1PH/60Hz
MHD-300 -
MHD-1200
300-1200 cfm
-40°F (-40°C)
Standard
-100°F (-70°C)
Optional
150 psi g
(10.3 bar g)
80 psi g
(5.5 bar g)
120°F
(49°C)
50°F
(10°C)
460V/3Ph/60Hz
- Control Power:
115V/1Ph/60Hz
(575V/3Ph/60Hz
Optional)
MHD-1500 -
MHD-8000
1500-8000 cfm
-40°F (-40°C)
Standard
-100°F (-70°C)
Optional
135 psi g
(9.3 bar g)
80 psi g
(5.5 bar g)
120°F
(49°C)
50°F
(10°C)
460V/3Ph/60Hz
- Control Power:
115V/1Ph/60Hz
(575V/3Ph/60Hz
Optional)

1. PowerLoc Demand Control Option is an Energy Management system that adjusts energy use to demand. Features automatic demand control, digital dewpoint readout, 4-20mA analog output (optional) and high humidity alarm with contacts.
2. Above information should be used as a guideline. Flows are at 100 psi g inlet pressure, 100°F inlet temperature and 100°F ambient temperature. For specific applications, please consult mdi.
3. Weight includes desiccant (shipped loose Models MHD 1500 and up).
4. For sizing at other temperatures and pressures, please consult mdi.
* 575V UNITS ARE AVAILABLE FOR THE CANADIAN MARKET IN PLACE OF 460V

Heatless Twin Tower Design with Energy Management System (EMS)
*Scroll to the right on mobile to see entire chart
   Model
SCFM
Heater kW
Air Connection
MHD-100-1.0NPT-EMS
100
1.5
1" NPT
MHD-135-1.0NPT-EMS
135
1.5
1" NPT
MHD-200-1.5NPT-EMS
200
3
1-1/2" NPT
MHD-250-1.5NPT-EMS
250
3
1-1/2" NPT
MHD-300-1.5NPT-EMS
300
4
1-1/2" NPT
MHD-400-2.0NPT-EMS
400
6
2" NPT
MHD-500-2.0NPT-EMS
500
6
2" NPT
MHD-600-2.0NPT-EMS
600
9
2" NPT
MHD-800-2.0NPT-EMS
800
9
2" NPT
MHD-1000-3FLG-EMS
1000
13
3" Flg
MHD-1200-3FLG-EMS
1200
13
3" Flg
MHD-1500-4FLG-EMS
1500
18
4" Flg
MHD-2000-4FLG-EMS
2000
25
4" Flg
MHD-2600-4FLG-EMS
2600
25
4" Flg
MHD-3000-6FLG-EMS
3000
30
6" Flg

*Scroll to the right on mobile to see entire chart
   Description
Flow Range @ 100 psi g
(7 bar g)
Dewpoint
Max Operating
Pressure
Min Operating
Pressure
Max Inlet
Temp
Min Inlet
Temp
Electrical
MHD-100 -
MHD-250
100-250 cfm
-40°F (-40°C)
Standard
-100°F (-70°C)
Optional
150 psi g
(10.3 bar g)
80 psi g
(5.5 bar g)
120°F
(49°C)
50°F
(10°C)
240V/1PH/60Hz
MHD-300 -
MHD-1200
300-1200 cfm
-40°F (-40°C)
Standard
-100°F (-70°C)
Optional
150 psi g
(10.3 bar g)
80 psi g
(5.5 bar g)
120°F
(49°C)
50°F
(10°C)
460V/3Ph/60Hz
- Control Power:
115V/1Ph/60Hz
(575V/3Ph/60Hz
Optional)
MHD-1500 -
MHD-8000
1500-8000 cfm
-40°F (-40°C)
Standard
-100°F (-70°C)
Optional
135 psi g
(9.3 bar g)
80 psi g
(5.5 bar g)
120°F
(49°C)
50°F
(10°C)
460V/3Ph/60Hz
- Control Power:
115V/1Ph/60Hz
(575V/3Ph/60Hz
Optional)

1. PowerLoc Demand Control Option is an Energy Management system that adjusts energy use to demand. Features automatic demand control, digital dewpoint readout, 4-20mA analog output (optional) and high humidity alarm with contacts.
2. Above information should be used as a guideline. Flows are at 100 psi g inlet pressure, 100°F inlet temperature and 100°F ambient temperature. For specific applications, please consult mdi.
3. Weight includes desiccant (shipped loose Models MHD 1500 and up).
4. For sizing at other temperatures and pressures, please consult mdi.
* 575V UNITS ARE AVAILABLE FOR THE CANADIAN MARKET IN PLACE OF 460V

PowerLoc Demand Control Option is an Energy Management system that adjusts energy use to demand. Features automatic demand control, digital dewpoint readout, 4-20mA analog output (optional) and high humidity alarm with contacts.




*Scroll to the right on mobile to see entire chart
Model
Length (in)
Width (in)
Height (in)
Weight (lbs net)
MHD-100
18
31
83
680
MHD-135
22
40
83
720
MHD-200
22
40
85
920
MHD-250
22
40
85
920
MHD-300
27
43
87
1,370
MHD-400
27
47
88
1,400
MHD-500
27
50
89
2,060
MHD-600
28
52
92
2,350
MHD-800
35
63
93
3,035
MHD-1000
41
74
102
4,195
MHD-1200
41
74
113
5,215
MHD-1500
60
78
113
7,765
MHD-2000
60
78
110
8,565
MHD-2600
60
96
112
11,562
MHD-3000
60
96
112
12,002