Low Temperature Thermometer
RT8B
User Guide
8
4.3 Adjusting the ‘Emissivity’ Setting
To ensure that the AMETEK Land
RT8B
thermometer makes consistent accurate
temperature measurements, an emissivity correction value must be set in the
thermometer which accurately corresponds with the target under observation.
The emissivity value can be set in the range 0.1 to 1.09 in adjustable increments of
0.01. The thermometer is supplied with the emissivity value pre-set to 1.00.
To set the emissivity value:
•
Remove the screw-on cap covering the control switches.
•
Set the emissivity value using the ‘SW1’ and ‘SW2’ switches (see Fig. 7).
Switch ‘SW1’ denotes the
first figure after the decimal point
of the emissivity value.
Switch ‘SW2’ denotes the
second figure after the decimal point
of the emissivity
value.
e.g. for an emissivity value of ‘0.87’, ‘SW1’ should be set to ‘8’ and ‘SW2’ should be set
to ‘7’.
When switch ‘SW1’ is set to ‘0’, this denotes a
‘1’ before and a ‘0’ after the decimal
point
of the emissivity value.
e.g. for an emissivity value of 1.00, ‘SW1’ should be set to ‘0’ and ‘SW2’ should be set
to ‘0’.
•
Refit the screw-on cap covering the control switches.
Fig. 7
RT8B
Thermometer ‘Emissivity’ and ‘Response Speed’ Control
Emissivity
Example = 0.85
Response Speed
Fully anti-clockwise = 1sec (3
t
)
Fully clockwise = 10sec (3
t
)
SW2
SW1
P1
Example settings
Emissivity SW1 SW2
0.10
1 0
0.80
8 0
0.85
8 5
0.92
9 2
1.00
0 0
e
=0.85
