tekmar 079 Slab Sensor - Manual (Page 3)

3 of 4 © 2007 D 079 - 05/07
Resistance Table Sensor Testing Instructions
A good qualit
y t
e
st me
ter capable of measuring up t
o
5,000 kΩ (1 kΩ = 1
000Ω) is r
equir
ed t
o
measur
e t
he sensor r
esistance. In a
ddition
to
t
h
is, t
he actual t
e
mperatur
e must be measur
ed wit
h eit
her a good qualit
y digital t
hermome
te
r,
or if a t
hermome
ter is no
t a
va
ilable, a
second sensor can be placed alongside t
he one t
o
be t
e
st
ed and t
he r
eadings compar
ed.
F
irst measur
e t
he t
e
mperatur
e using t
he t
hermome
ter and t
hen measur
e t
he r
esistance of t
he sensor at t
he contr
ol. The wir
es fr
o
m t
he
sensor must no
t be connect
ed t
o
t
he contr
ol while t
he t
e
st is per
formed. Using t
he char
t on t
he f
ollo
wing page, estimat
e t
he t
e
mperatur
e
measur
ed b
y
t
he sensor
. The sensor and t
hermome
ter r
eadings should be close. If t
he t
e
st me
ter r
eads a v
e
ry
high r
esistance, t
h
er
e
ma
y be a br
ok
en wir
e, a poor wiring connection or a def
ectiv
e sensor
. If t
he r
esistance is v
e
ry
lo
w
, t
he wiring ma
y be shor
ted,
t
her
e ma
y
be moistur
e in t
he sensor or t
he sensor ma
y be def
ectiv
e. T
o
t
e
st f
o
r a def
ectiv
e sensor
, measur
e t
he r
e
sistance dir
ectly at t
h
e sensor
location. Do no
t apply v
oltage t
o
a sensor at an
y time as damage t
o
t
he sensor ma
y r
esult.
T
e
mperature
R
esistance
T
e
mper
ature
R
esistance
T
e
mperature
R
esis
tance
T
e
mperature
R
esistance
°F
°C
Ω
°F
°C
Ω
°F
°C
Ω
°F
°C
Ω
-50
-46
490,8
13
20
-7
46,2
18
90
32
7,334
1
60
7
1
1,689
-45
-43
405,7
1
0
25
-4
39,9
13
95
35
6,532
1
6
5
74
1,538
-40
-40
336,606
30
-1
34,558
1
0
0
3
8
5,828
17
0
7
7
1,403
-35
-3
7
280,2
79
35
2
29,996
1
0
5
41
5,2
1
0
17
5
7
9
1,28
1
-30
-34
2
34,
196
40
4
26,099
11
0
4
3
4,665
18
0
8
2
1,
17
2
-25
-32
196,358
45
7
22,7
63
11
5
4
6
4
,1
84
18
5
8
5
1,0
7
3
-20
-29
1
65,
18
0
5
0
1
0
19,900
12
0
4
9
3,7
60
19
0
8
8
983
-1
5
-26
139,402
55
13
17
,436
12
5
5
2
3,383
19
5
9
1
903
-1
0
-23
11
8,0
18
60
1
6
15,3
11
13
0
5
4
3,050
200
93
829
-5
-2
1
1
00,22
1
6
5
18
13,4
74
13
5
5
7
2,7
54
205
96
7
6
3
0
-1
8
85,362
70
2
1
11
,883
14
0
6
0
2,490
2
1
0
9
9
703
5
-1
5
7
2,9
18
7
5
2
4
1
0,50
1
145
63
2,255
2
15
1
02
648
1
0
-1
2
62,465
80
2
7
9,299
15
0
6
6
2,045
220
1
0
4
598
15
-9
53,658
85
29
8,250
15
5
6
8
1,85
7
225
1
0
7
553