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Hydra 798 Iss.10 – 04/18
Instrument Address
The controller has a configurable "address" which is used for PC communications. Each instrument has an address;
this allows several instruments to be connected in parallel on the same communications bus. The default value is 1 for
the controller and 2 for the over/under temperature controller. This address would only need to be changed if more
than one piece of equipment is connected to the same PC port.
To check the Address value press the scroll key until the lower display indicates,
ADDR
The upper display will show the current value that can be modified with the UP and DOWN keys.
MONITORING THE CONTROLLER STATUS
A row of beacons indicate the controllers status as follows,
Output 1 (op1)
Heater – shows when the heater is active, seen to pulse to display heater output
REM
This beacon indicates activity on the PC interface
Output 2 (op2)
(M Only)
Full cooling – When illuminated shows full cooling and the by-pass valve is closed.
When not illuminated, indicates the by-pass valve is open and reduced cooling is
enabled
Output 4 (op4)
Indicates the chiller is enabled and working
Units
The units can be changed from °C. Press the scroll key until the lower displays shows
UNITS
Use the UP and DOWN keys to select the desired display unit. Continue to press the scroll key to access the
following options
Pb
Ti
Td
These controls allow the user more level of control over the bath performance and should only be adjusted if the user
has a full understanding of PID control systems.
