How to Identify and Select Trend & WIKA Bimetal Thermometers
Wika manufactures both Wika and Trend labeled line of thermometers as well as a complete selection of accessories.
This page covers both the Process and the Industrial Bimetal Thermometers. REQUEST QUOTEHow to Identify Trend & WIKA BimetalThermometers
Example of Model Code
30 060 A 0 01 G 4 XX
30 - Basic Model Code, 3" back connected, resettable
060 - Stem Length, 6 Inches
A - Logo, Trend
0 - Scale Type, Dual Scale
01 - Range 50/500 °F & 10/260 °C
G - Crystal, glass
4 - Process Connection ½" NPT
XX - Option Code(s)
Basic Model
Measure the
diameter of the Dial in inches, Also note if there is a screw
or "bolt head" in the back. This determines if it can be adjusted
or "resettable". Also note the mounting of the stem. the choices
are: back, bottom and adjustable angle. You may also find some
with left or right hand mounting, but these are less common.
Select the Model from the following Table.
General Specifications
CLICK ON PICTURES FOR LARGER IMAGE
Model | Dial Size | Connection | Resettable |
---|---|---|---|
20 | 2" | Back | No |
30 | 3" | Back | Yes |
31 | 3" | Bottom | Yes |
32 | 3" | Adjustable | Yes |
33 | 3" | Back | No |
34 | 3" | Bottom | No |
50 | 5" | Back | Yes |
51 | 5" | Bottom | Yes |
52 | 5" | Adjustable | Yes |
53 | 5" | Back | No |
54 | 5" | Bottom | No |
Stem Length
Measure the stem from the top of the threaded connection to the end of the stem. The standard lengths in inches are: 2.5, 4, 6, 9, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72. The length is specified as XXX; 2.5" = 025; 72" = 720
A - Trend
D - Wika
Scale
There
are three types of scales for the dial: Dual Scale, Fahrenheit
only and Celsius (Centigrade). The Dual scale is most common
but some consider it confusing and prefer the single scale.
Use "0" for Dual, "1" for Celsius and "2" for Fahrenheit
CLICK ON PICTURES FOR LARGER IMAGE
Range
Select the two digit range code from the table on the right. Click on the table to see a larger version
Lens
Also know as the window or crystal. The standard
is glass. Although tough it can break and leave fragments. Shatterproof
glass may break but will not shatter into fragments. Acrylic
and Lexan® are plastic lens and may replace the glass. Chemical
fumes may fog the acrylic or Lexan®
A - Acrylic
L - Lexan ® (only on 2" & 3" dial)
S - Shatterproof Glass
G- Glass
Process Connection
By far the most common connection is 1/2" NPT.
This connection has a diameter of approx 27/32 (0.840) inches.
Other connections are: Plain (None), 1/8" NPT, 1/4" NPT, 3/8"
NPT, G 1/2 B or a Union connection.
Click here to see dimensions for pipes
http://www.plumbingsupply.com/pipethreadsizing.html
0 - Plain
1 - 1/8" NPT
2 - 1/4" NPT
3 - 3/8" NPT
4 - 1/2" NPT
5 - G 1/2B
7 - Union Connection
Options
Silicon Fill is normally used where there is severe mechanical vibration. The silicon dampens and lubricates the internal mechanism, reducing oscillation and premature wear. Max Temp: 50/500 °F. Only available on Models: 30, 31,32,50,51,52
Sharp Tip:
The tip of the stem is normally round to flat.
The sharp tip makes it easier to pierce things
MM - Min/Max Pointer
This is a manual indicator that is moved by the temperature indicator
and shows the max. or min temperature reached. It is reset manually.
Only available on Models 30 and 50
Connection Location
Bottom
connected thermometers can be ordered with the connection oriented
to the left (LS), right (RS) or the top (TS)
Heavy Duty If the thermometer is going to be inserted into compost, meat,
etc. then a heavy duty stem is recommended. Option
HD provides a 3/8" heavy duty stem with 2-1/2" x 1/4" OD
sensitive tip, the HA option provide for a 3/8" heavy
duty stem for the entire length and the HS option provides
a 3/8" stem, reduced tip with a sharp point.
EZ-Insertion Handle
The thermometer is shown with the optional EZ-Insertion Handle.
This is recommended where the
thermometer is inserted compost, meat etc. It saves using the
dial as the handle P/N TA600-0163
316 Stainless Steel The case and stem is made of 304 SS. In some cases where a thermowell is not used, 316 SS is available for the wetted parts. Option code SS. This is not available with the heavy duty stem. Please note that a thermowell is recommended for all pressure applications