Models 3940 and 3949 _____________________________________________________________________________Service
6 - 1
4. Using a clamp-on ammeter, establish that current is
flowing in the blue wire going to the heater connectors.
Refer to Figure 5-2.
5. Proper current is about 3.6 amps. If the current is not
flowing and the humidity indicator is on, rotate the small
slotted screw in the shaft of the safety thermostat coun-
terclockwise, using a jeweler’s screwdriver, until the
current flows to the heaters.
6. Allow the steam generator to operate for about 30 min-
utes continuously. If the heaters cycle off due to the
safety thermostat, rotate the small slotted screw further
counterclockwise to maintain the heater’s operation.
7. After 30 minutes, turn the small slotted screw clockwise
very slowly until the heaters shut off.
8. Turn the slotted screwdriver 1-1/2 turns counterclock-
wise. The thermostat is now properly adjusted.
9. Replace the cabinet top and return the incubator to serv-
ice.
Section 6 - Specifications
Temperature
Control
±0.1°C @ +37°C (98.6°F)
Range
0°C (32°F) to +60°C (140°F)
Sensor
RTD
Controller
Digital electronic proportional
Setpoint
Digital
Display
Digital LED
Readability
0.1°C
Setability
0.1°C
Uniformity
±0.3°C at 25°C to 37°C with six
shelves installed*
Shelves
Standard
6
Maximum
19
Dimensions
30.62”W x 25.81”F-B
(77.78 cm x 65.56 cm)
Construction
Solid stainless steel reinforced
Surface Area
5.4 sq. ft. (.51 sq. m) per shelf
Max. Per Chamber
104.3 sq. ft. (9.69 sq. m)
Clearance
Adjustable on 3” (7.62 cm) centers
Loading
35 lbs. (16 Kg) (slide in and out)
50 lbs. (23 Kg) (stationary)
Construction
Volume
29 cu. ft. (823 liters)
Interior
304 2B stainless steel
Exterior
Cold rolled steel
Insulation
2” (5.1cm) Foamed urethane
Outer Door Gasket Four sided vinyl compression
Finish
Powder coated. Salt spray tests
exceed 1000 hrs. per ASTM
Standard B117-85
Weight
Net
800 lbs. (363 Kg)
Shipping
Motor
850 lbs. (386 Kg)
Air
940 lbs. (476 Kg)
Ocean
985 lbs. (447 Kg)
Temperature Alarm
Sensor
Thermostat
Controller
Thermostat
Setpoint
Analog reference dial
Alarm
Audible/visual
