Fisher Scientific Isotemp 500 Series User manual

Instruction Manual
Fisher Scientific
IsotempâEconomy Incubators
500 Series
Model 525D (Small)
Cat. No. 11-690-525D & -526D
Model 537D (Medium)
Cat. No. 11-690-537D & -538D
Model 550D (Large)
Cat. No. 11-690-550D & -551D

Table of
Contents
Introduction...................................................................... 1
Installation
Selecting a Location............................................... 2
Unpacking .............................................................. 2
Preparing the Incubator......................................... 3
Power Switch ......................................................... 3
Convenience Outlet .................................................3
Controls............................................................................. 4
Safety Precautions............................................................ 5
Operation .......................................................................... 5
Limit Alarms .................................................................... 6
Calibration........................................................................ 7
Service .................................................................................9
Replacing the Glass Door ......................................10
Accessing the Electronics Compartment ...............11
Replacing the Heater..............................................12
Replacing the Controller ........................................13
Replacing the Control Thermocouple....................14
Troubleshooting ...............................................................15
Replacement Parts ...........................................................16
Performance Characteristics ..........................................17
Specifications ....................................................................18
Electrical Schematic.........................................................19

Page 1 Isotemp Economy Incubators
Introduction Fisher Isotemp 500 Series Economy Incubators are available in three
sizes: small (Model 525D), medium (Model 537D) and large (Model
550D). All models provide analog, on/off control at operating
temperatures ranging from 30 °C (86°F) to 75 °C (167 °F).
Inlet air enters through a port located under the incubator floor. Heat
generated convection then gently moves the air in a vertical circulation
pattern. Exhaust air is vented through a port at the incubator top.
The Model 525D accommodates a maximum of five shelves. The Model
537D holds eight shelves, while the 550D holds up to eleven.
Isotemp incubators incorporate a variety of safety features. A safety
backup is built into the controller: if the primary heater control fails, the
Backup will maintain control at 3 °C above the set point. An alarm LED
Then indicates that the backup controller is operating the incubator. A
circuit breaker protects the incubator from power surges.
The glass door is designed to meet specification without a door gasket to
provide maximum viewing of the interior.

Isotemp Economy Incubators Page 2
Installation
Selecting a
Location Choose a location for the incubator which will provide an area
approximately 2 ft x 2 if. The bench selected must be capable of
supporting at least 120 lbs for the Model 525D, 130 lbs for the Model
537D, or 135 lbs. for the Model 550D. Appropriate electrical power must
be available. Locate the incubator within three feet of the power outlet so
that no extension cord is required.
Unpacking Fisher Isotemp®incubators are shipped in a single carton. After
unpacking, locate each item shown in the list below. Report any missing
items, by name and part number, to your Fisher branch. In the event of
shipping damage, retain the shipping material and file a claim with the
final carrier.
Item
Incubator Assembly
Model 525D (small)
Cat.# 11-690-525D 120 V, 50/60 Hz
Cat. # 11-690-526D 240 V, 50/60 Hz
Model 537D (medium)
Cat.# 11-690-537D 120 V, 60/50 Hz
Cat.# 11-690-538D 240 V, 50/60 Hz
Model 550D (large)
Cat.# 11-690-550D 120 V, 60/50 Hz
Cat.# 11-690-551D 240 V, 50/60 Hz
Shelves
Models 525D & 537D (one provided)
Model 550D (two provided)
Shelf Supports
Models 525D & 537D (two provided)
Models 550D (four provided)
Instruction Manual

Page 3 Isotemp Economy Incubators
Preparing the To prepare the incubator for operation, perform the following
Incubator procedures:
1. Install the shelf.
2. Make certain all packing material has been removed from incubator
chamber.
3. Connect the line cord to an appropriate electrical outlet.
Caution: See data plate on incubator for voltage, current and line
frequency specifications. Check that the power
requirements of the incubator will not overload the circuit
to which it will be connected.
4. The incubator is now ready for operation. No preliminary adjustments
or calibrations are required. Depending on the customer application
and customer laboratory procedures, an initial calibration may be done
at this point.
Power
Switch The 500 Series incubators feature a front panel mounted power switch
which is a combination power switch and circuit breaker, eliminating the
need for separate fusing. The circuit breaker will interrupt power in the
event of a heater malfunction.
Press the I (upper) half of the rocker-type power
switch to the in position to turn the incubator on. Press the
O (lower) half to the in position to turn off incubator
power. To reset the breaker, first place the switch to
the off position, then return it to the on position.
___________________________________________________________
Convenience
Outlet The 500 Series incubators feature a convenience electrical outlet located
inside the incubator, at the lower right of the back panel. This outlet is
rated at the same voltage as the incubator itself and is limited to a
maximum current of 5A for all models. If the current limit is exceeded,
the circuit breaker will trip. For safety, the integrity of the electrical
ground should always be maintained.

Isotemp Economy Incubators Page 4
Controls The 500 Series controller features three LED’s which indicate,
respectively, that power is being applied to the incubator heaters, an
alarm condition exists or that incubator power is on. A temperature dial,
marked in five degree increments, serves to set the incubator temperature.
Temperature Sets the incubator operating temperature in degrees
Dial Celsius (°C).
Heat Indicator Lights when power is being supplied to the incubator
heater.
Alarm Indicator Lights if the actual incubator temperature exceeds the
alarm temperature. The alarm temperature is
factory-adjusted to be 3 °C above the set temperature.
Power Indicator Lights when the power is on.

Page 5 Isotemp Economy Incubators
Safety
Precautions Before Operating the oven, always observe the
following Safety Precautions:
This unit is not explosion proof, do not use in the presence of
flammable or combustible materials; fire or explosion may result. Unit
contains components, which may ignite such materials.
Fumes and spillage from acidic solutions cause corrosion of the
stainless chamber. Care should be taken to maintain a neutral pH at all
times.
•Wear insulated gloves.
•Use tongs.
•Never stand in front of an open oven.
•Use safety goggles.
Operation The 500 Series incubators maintain a set temperature until that set
temperature is changed.
To achieve a set temperature, perform the following:
1. Rotate the temperature dial full counter-clockwise.
2. Place the power switch in the ON position. The Power indicator will
come on.
3. Rotate the temperature dial to the desired set temperature. The Heat
indicator will then come on.
4. When the actual temperature approaches the set temperature, the
Heat indicator will cycle on and off, maintaining the set temperature.
NOTE: 1. After controlling at a given temperature, if the
temperature dial is rotated CCW, the alarm indicator will
come on. This is normal operation.
2. Since this is an analog control with 5 degree
increments. The user may choose to add a thermometer
and make minor adjustments to reach a more precise
temperature setting.

Isotemp Economy Incubators Page 6
Limit The 500 Series controllers feature a deviation alarm which alerts the
Alarms operator and interrupts heater power whenever the actual incubator
temperature differs from the set temperature by more than 3 °C. This set
limit cannot be adjusted by the operator.
If the actual temperature exceeds the alarm limit, the alarm indicator LED
will light.
The reference point for the alarm is the set temperature. Any change in the
set temperature will cause a corresponding shift in the alarm temperature.
Example:
If the set temperature is 40 °C, the alarm will trip at 43 °CC. If the set
temperature is changed to 50 °C, the alarm will follow the set temperature
and trip at 53 °C.
Changing the set temperature to a value more than 3 °C below the present
incubator temperature will trip the alarm. Power is removed from the
heaters when an alarm condition occurs.