User Guide User Guide
Page 5PP307 Page 5PP307
Note
• SNR1 ratio thermometers have an internal heater that needs to warm
up before a valid temperature readings can be produced, typically 2
to 3 minutes at room temperature. A further stabilisation
time of 2 to 3 minutes will be required before a fully stable reading
will be produced following the initial warming period.
• The instrument indicates ‘Obscuration’ and the temperature output
is either held under range or over range whilst warming up, depending
on the user’s setting for either upscale or downscale drive under
conditions of signal obscuration.
• At ambient temperatures of 50°C or above the instrument will produce
a valid output immediately, but will still require 2 to 3 minutes settling
time.
• In a cold environment, at the lower end of the ambient operating
temperature range, the warm up time required may be over 10 minutes
at the nominal 24V power supply voltage. A longer
period may be required if the power supply voltage is below the
nominal value. In cold environments and in applications where the
process is frequently powered-down, e.g. overnight, or if rapid process
restart is required it is recommended that the power is kept applied
to SNR1 installations.
Note
• SNR1 ratio thermometers have an internal heater that needs to warm
up before a valid temperature readings can be produced, typically 2
to 3 minutes at room temperature. A further stabilisation
time of 2 to 3 minutes will be required before a fully stable reading
will be produced following the initial warming period.
• The instrument indicates ‘Obscuration’ and the temperature output
is either held under range or over range whilst warming up, depending
on the user’s setting for either upscale or downscale drive under
conditions of signal obscuration.
• At ambient temperatures of 50°C or above the instrument will produce
a valid output immediately, but will still require 2 to 3 minutes settling
time.
• In a cold environment, at the lower end of the ambient operating
temperature range, the warm up time required may be over 10 minutes
at the nominal 24V power supply voltage. A longer
period may be required if the power supply voltage is below the
nominal value. In cold environments and in applications where the
process is frequently powered-down, e.g. overnight, or if rapid process
restart is required it is recommended that the power is kept applied
to SNR1 installations.
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