Bench Oven Specs

Analog and Digital General Specifications Model 21-250 Model 21-350 Model 31-350 Model 51-550
Int. Dimensions
Inches WxHxD
CM WxHxD

25.5x20x24
64x50x60

25.5x20x24
64x50x60

25.5x30x24
64x76x60

25.5x20x22.5
64x50x57
Ext. Dimensions
Inches WxHxD
CM WxHxD

33x24x35.5
83x60x90

33x24x35.5
83x60x90

33x34x35.5
83x86x90

33x24x35.5
83x60x90
Capacity
Cubic Feet
Liters

7
198

7
198

10.6
300

6.60
186
Max Temperature
°Farenheit
°Celcius

300°F
150°C

450°F
232°C

450°F
232°C

550°F
287°C
Shelves
Max Per Unit
Max Pounds/Shelf

11 Shelves
80 Pounds/Shelf

11 Shelves
80 Pounds/Shelf

17 Shelves
80 Pounds/Shelf

11 Shelves
80 Pounds/Shelf
Electrical
Volts/Amps
Watts
Plug/Nema

115/9.2
1050
5-15P*

120/16
1920
5-20P*

120/16
1920
5-20P*

230/12.5
30000
6-20P
Weight
Shipping
Stand Alone

185 Pounds
165 Pounds

185 Pounds
165 Pounds

225 Pounds
200 Pounds

195 Pounds
170 Pounds

*230 Volt optional on models 21 & 31 for an additional fee.

Digital Control Performance Characteristics

Performance Characteristics Model 21-250/ER Model 21-350/ER Model 31-350/ER Model 51-550/ER
Control Sensitivity
@ 100°C
@ 200°C

+/- 2.0/0.2°C
NA

+/- 2.0/0.3°C
+/- 2.5/0.5°C

+/- 2.5/0.5°C
+/- 3.0/0.5°C

+/- 3.0/0.5°C
+/- 3.5/0.5°C
Uniformity
@ 100°C
@ 200°C

+/- 2.5/2.0°C NA

+/- 2.5/2.0°C
+/- 3.5/4.0°C

+/- 3.0/2.0°C
+/- 4.0/3.0°C

+/- 3.5/2.5°C
+/- 5.5/4.5°C
Time to Temp.
Ambient to 100°C
Ambient to Max

15-16 minutes
36-38 minutes

8-9 minutes
30-32 minutes

9-10 minutes
35-38 minutes

3min/6min
40-45 minutes
Recovery @150°C
Door Open 15s
Door Open 30s

4-5 minutes
5-6 minutes

2-3 minutes
3-4 minutes

3-4 minutes
4-5 minutes

1-2 minutes
2-3 minutes
Repeatability @150°C
(Set Point Drift)**

+/- 2.0/0.5°C

+/- 1.0/0.5°C

+/- 1.5/0.5°C

+/- 2.0/0.75°C
Air Changes Max/Hour
@150°C w/No Load

8 to 12

8 to 12

8 to 12

8 to 12
Max Chamber Air Velocity 7 feet/second 7 feet/second 7 feet/second 7 feet/second

*Performance Characteristics for STANDARD VOLTAGE ONLY. Alternate voltage models may vary. ALL tests conducted under controlled laboratory conditions.
**Repeatability or Set Point Drift measured for 24 hrs. with controlled laboratory temperatures not varying more than 2°C & supply voltage by not more than 2%.