K-Patents PR-21-S - Manual (Page 102)

96 PR-21-S instruction manual
10.4 PR-21-S process refractometers in potentially explosive at-
mosphere
The PR-21 refractometer series can be used in locations with potentially explosive
atmosphere with following modifications, made by K-Patents Oy.
The PR-21-...-FM refractometer is certified by Factory Mutual Research Corpora-
tion, Certificate No. 3050975. Equipment Ratings: Nonincendive for use in Class
I, Division 2, Groups A, B, C & D, Hazardous (Classified) Locations. Temperature
identification rating for PR-21-...-FM is T6 (T
amb
= 45 °C).
10.4.1 Equipment
The K-Patents refractometer system (Figure 10.9) for potentially explosive atmos-
phere locations consists of a modified refractometer sensor PR-21-...-FM, a stan-
dard Indicating transmitter DTR, a sensor connector PR-8021-FM and a sensor
cable PR-8230-... The connector has to be secured mechanically by the securing
clamp.
Figure 10.9 Refractometer system PR-21-...-FM