Campbell Manufacturing CR10 User Manual

Parameter 2 is the voltage range to use when
making the measurement.  The output of a type
T thermocouple is approximately 40 microvolts
per degree C difference in temperature
between the two junctions.  The 

±

2.5 mV scale

will provide a range of +2500/40 = +62.5 

o

C

(i.e., this scale will not overrange as long as the
measuring junction is within 62.5 

o

C of the

panel temperature).  The resolution of the 

±

2.5

mV range is 0.33 µV or 0.008 

o

C.

Parameter 3 is the analog input channel on
which to make the first, and in this case only,
measurement.

Parameter 4 is the code for the type of
thermocouple used.  This information is located
on the Prompt Sheet or in the description of
Instruction 14 in Section 9.  The code for a type
T (copper-constantan) thermocouple is 1.

Parameter 5 is the Input Storage location in
which the reference temperature is stored.
Parameter 6 is the Input Storage location in
which to store the measurement (or the first
measurement; e.g., if there are 5 repetitions
and the first measurement is stored in location
3, the final measurement will be stored in
location 7).  Parameters 7 and 8 are the
multiplier and offset.  A multiplier of 1 and an
offset of 0 outputs the reading in degrees C.  A
multiplier of 1.8 and an offset of 32 converts the
reading to degrees F.

In this example, the sensor is measured once a
minute, and the day, time, and average
temperature are output every hour.  Once a day
the day, time, maximum and minimum
temperatures and the times they occur will be
output.  

Final Storage data will be sent to Storage
Module.  Remember, all on-line data output to a
peripheral device is accomplished with
Instruction 96 (Sections 4.1 and 12).

The first example described program entry one
keystroke at a time.  This example does not
show the "A" key.  Remember, "A" is used to
enter and/or advance (i.e., between each line in
the example below).  This format is similar to
the format used in EDLOG.

It's a good idea to have both the manual and
the Prompt Sheet handy when going through
this example.  You can find the program
instructions and parameters on the Prompt
Sheet and can read their complete definitions in
the manual.

To obtain daily output, the If Time instruction is
again used to set the Output Flag and is
followed by the Output Instructions to store time
and the daily maximum and minimum
temperatures and the time each occurs.

Any Program Control Instruction which is used
to set the Output Flag high will set it low if the
conditions are not met for setting it high.
Instruction 92 above sets the Output Flag high
every hour.  The Output Instructions which
follow do not output every hour because they
are preceded by another Instruction 92 which
sets the Output Flag high at midnight (and sets
it low at any other time).  This is a unique
feature of Flag 0.  The Output Flag is set low at
the start of each table (Section 3.7).

When editing an existing program in the CR10,
entering a new instruction inserts the
instruction; entering a new parameter replaces
the previous value.

To insert an instruction, enter the program table
and advance to the position where the
instruction is to be inserted (i.e., P in the data
portion of the display) key in the instruction
number, and then key A.  The new instruction
will be inserted at that point in the table,
advance through and enter the parameters.
The instruction that was at that point and all
instructions following it will be pushed down to
follow the inserted instruction.

An instruction is deleted by advancing to the
instruction number (P in display) and keying #D
(Table 4.2-1).

To change the value entered for a parameter,
advance to the parameter and key in the
correct value then press A.  Note that the new
value is not entered until A is keyed.