Watts LFTB User Manual
Series lftb, Lead free, Center back entry bimetal thermometers
For Commercial, Residential and Institutional Applications
ES-LFTB
Series LFTB
Dial Sizes: 1
1
⁄
2
", 2
1
⁄
2
", 3”, 4” (40, 65, 80, 100mm)
Series LFTB Center Back-Entry Bimetal Lead Free* Thermom-
eters are used in commercial, residential, and institutional
HVAC applications. These thermometers feature zinc plated
steel cases, Kostil Polymer windows. They are furnished with
a
1
⁄
2
" NPT Lead Free* brass thermowells with set screw, and
bimetal spiral spring sensing elements. The LFTB features
Lead Free* construction to comply with Lead Free* installla-
tion requirements. Series LFTB thermometers are available
in various temperature rating scales, probe lengths and dual
reading scale (°F, °C).
Features
• Zinc plated steel case
• Kostil polymer window
• Furnished with
1
⁄
2
" NPT Lead Free* brass
thermowells with set screw
• Bimetal spiral spring sensing element
Approvals
Certified by The Northern Certification Society of Italy
(Det Norske Verita Italia S.r.l.)
Standards
ISO 9002 quality standard
LFTB
LEAD FREE
*
Job Name –––––––––––––––––––––––––––––––––––––––––––
Contractor ––––––––––––––––––––––––––––––––––––––––––––
Job Location –––––––––––––––––––––––––––––––––––––––––
Approval –––––––––––––––––––––––––––––––––––––––––––––
Engineer –––––––––––––––––––––––––––––––––––––––––––––
Contractor’s P.O. No. ––––––––––––––––––––––––––––––––––
Approval –––––––––––––––––––––––––––––––––––––––––––––
Representative ––––––––––––––––––––––––––––––––––––––––
Temperature
Differs According to Model
Working Temperature Range: -22°F to 248°F
(-30°C to 120°C)
Materials
Case:
Zinc plated steel
Window:
Kostil polymer
Thermowell:
Lead Free* Brass
Sensing Element: Bimetal spiral spring
Dimensions — Weights
Size
Model
Scale
Probe Size
diMenSionS
Weight
A
B
C
D
E
in.
˚F
C°
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
lbs
kgs
1
⁄
2
1
⁄
2
LFTB-1
1
⁄
2
-132-176
32 – 176
0 – 80
1
25
1
1
⁄
2
40
1
9
⁄
16
40
1
3
⁄
8
35
3
⁄
8
10
7
⁄
16
11
0.4
0.18
1
⁄
2
1
⁄
2
LFTB-2
1
⁄
2
-232-140
32 – 140
0 – 60
2
51
2
1
⁄
2
63
2
3
⁄
8
60
1
15
⁄
16
49
1
25
7
⁄
16
11
0.4
0.18
1
⁄
2
1
⁄
2
LFTB-2
1
⁄
2
-4 32-248
32 – 248
0 – 120
3
76
2
1
⁄
2
63
2
3
⁄
8
60
1
15
⁄
16
49
1
25
7
⁄
16
11
0.4
0.18
1
⁄
2
1
⁄
2
LFTB-2
1
⁄
2
-232-248
32 – 248
0 – 120
4
102
2
1
⁄
2
63
4
3
⁄
8
111
3
15
⁄
16
100
2
15
⁄
16
75
7
⁄
16
11
0.4
0.18
1
⁄
2
1
⁄
2
LFTB-3-2-144
-22 – 122
30 – 49
2
51
3
80
2
5
⁄
8
67
1
15
⁄
16
49
1
25
7
⁄
16
11
0.4
0.18
1
⁄
2
1
⁄
2
LFTB-3-2 32-248
32 – 248
0 – 120
2
51
3
80
2
9
⁄
16
64
1
15
⁄
16
49
1
25
7
⁄
16
11
0.4
0.18
1
⁄
2
1
⁄
2
LFTB-3-4 32-140
32 – 140
0 – 60
4
102
3
80
4
9
⁄
16
126
3
15
⁄
16
100
2
15
⁄
16
75
7
⁄
16
11
0.8
0.36
1
⁄
2
1
⁄
2
LFTB-4-2 32-248
32 – 248
0 – 120
2
51
4
100
2
5
⁄
8
67
1
15
⁄
16
49
1
25
7
⁄
16
11
1.2
0.54
d
e
1
⁄
2
" MnPt
b
a
Center Back Entry
LFTB
c
ES-LFTB 1329
© 2013 Watts
USA: Tel: (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com
Canada: Tel: (905) 332-4090 • Fax: (905) 332-7068 • www.watts.ca
A Watts Water Technologies Company
Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements, please contact Watts Technical Service. Watts
reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications
on Watts products previously or subsequently sold.
Center Back Entry Bimetal Thermometers
*The wetted surface of this product contacted by consumable
water contains less than 0.25% of lead by weight.