Omega OS137 - Manual (Page 9)

Operation 3
4
3.2 – Ambient Temperature
The transmitter can operate in an ambient temperature of 0 to 70°C (32 to 158°F)
without any water cool jacket. It can operate from 0 to 200°C (32 to 392°F) with
the water cool jacket accessory, OS137-WC (Fig 3-6 & 3-7). It can operate up to
110°C (230°F) with air cooling.
There is a warm up period of 1 to 2 minutes after power up. After the warm up
period, temperature measurement can be made.
When the ambient temperature around the transmitter changes abruptly, the sensor head
goes through a thermal shock. It takes a certain amount of time for the sensor head to get
stabilized to the new ambient temperature. For example, it takes about 30 minutes for the
transmitter to stabilize from the 25°C to 50°C (77°F to 122°F) ambient temperature.
3.3 - Atmospheric Quality
Environments with smoke, dust, and fumes dirty up the optical lens, and cause
erroneous temperature readings. To keep the surface of the optical lens clean, the
air purge collar accessory is recommended, OS137-AP (Fig 3-4).
The following figures show the Mounting Bracket (OS137-MB), Air Purge Collar
(OS137-AP), Stainless Steel Housing and Water/Air Cool Jacket (OS137-WC),
with built-in air purge collar.
Figure 3-3. Mounting Bracket, OS137-MB
DIMENSIONS mm (in)
57.2
(2.25)
12.7
(0.50)
95.3
(3.75)
90
90
17.4
(0.687)
19.8
(0.78)
3.2
(1/8)
3.2
(1/8)
17.4
(0.686)
INSERT
OS137 HEAD
INTO THE HOLE
98.8
(3.89)
96.5
(3.80)
53.3
(2.10)
25.4
(1.0)
50.8
(2.0)
25.9 (1.020) DIA.
4.3 (0.170) DIA.
4.3
(0.170)
15.2
(0.6)
32.5
(1.28)
28.6
(1.125)