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In a gas grill the only items that can be adjusted (calibrated?) are the air shutters on the venturi of the burner, the regulator pressure and the valve adjustment inside the valve stem.
Without knowing what, why and how you should not do this yourself but have an experienced technician do it for you. In either circumstance you should ignite the burners, turn them all the way to low and then make the adjustments based on the low flame heat. Then before tightening the set screws down, readjust to high and allow the appliance to heat up to make sure nothing unsafe happens.
The dealer you purchased the grill from, should have the Owner's Manual, since he forgot to leave it with you. or you can contact the the manufacturer, the Robert H Peterson Company (800) 332-3973 and they can email you one as an attachment. The heat is adjusted by the burner knob(s) on the front of the grill, once the burner(s) is lighted. It operates very much like a gas range. You'll need the Owner's Manual to calibrate the sensor.
Check with Lowe's. They carry a large number of generic grates for gas and charcoal grills. However you must have the dimensions of the grates or take the old ones with you to the store to match them up.
I could not find a replacement but used 2, 18" weber circular grates, one on each end and they overlap in the middle. It is not and ideal arrangement but it allows me to continue to use this discontinued charcoal grill that I love so much