Temperature
Range:
35ºC to 40ºC
Control
Type:
Proportional DC
Analogue
Output:
20mV / ºC
Probe
Diameter Rigid:
1.6 mm (0.06")
Probe
Diameter Flexible: 3mm (0.125")
The Harvard
Apparatus Homeothermic Blanket
System is a simple body
temperature controller. Offered
in a lightweight package with
improved electronic circuitry
and Analogue Output.
The
homoeothermic blanket system
consists of three parts: a
probe, a control unit, and a
blanket.
The flexible
probe is a precision thermistor
encapsulated in a bead of epoxy
resin at the top of a flexible
hollow plastic tube. The 2 mm
diameter probe is 100 mm (4 in)
long and has a 2 m (6 ft) long
cable with plug for attachment
to the control unit. It is
suitable for a wide range of
laboratory animals from adult
mice to large dogs.
The rigid probe is a stainless
steel shaft with a diameter of
1.6 mm and has a 2 m (6 ft)
cable with a plug that connects
to the control unit. It is
suitable for use with mice,
rodents, rabbits, cats and dogs.
The output of the temperature
sensing probe is used by the
control unit to proportionally
control the regulated,
low-voltage DC supply to the
blanket. This method of control
alleviates the interference
problems associated with that of
non-proportional control, such
as switching contacts, thus
enabling the system to be used
in conjunction with high-gain
recording systems.
The control temperature is
preset at 37°C (98.6°F) at the
factory, but can be adjusted
within the range of 35° to 40°C
(95° to 104°F) by means of a
control on the front panel. An
LCD display on the control unit
continuously displays the probe
temperature.
A horizontal
LED bar graph indicates the
level of power being delivered
to the blanket. When core
temperature is substantially
below the desired temperature
the bar graph will indicate
maximum power being delivered.
The blanket
consists of a highly flexible
insulated heating element, which
can be folded without risking
internal damage.
It is
electrically floating, with
respect to ground however; one
end of the heating element can
be grounded by a switch on the
front panel of the control unit.
The system operates
satisfactorily whether or not
the blanket is grounded.
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