Thin Film Platinum RTDs
HEL-700 Series
Datasheet
Thin Film Platinum RTDs
The HEL-700 Series Thin Film Platinum RTDs (Resistance Temperature Detectors) are designed to monitor or control critical
temperatures in industrial applications. They provide a linear change in resistance versus temperature, combining high
linearity, stability, accuracy, and wide temperature range in a small, fast-response package.
The HEL-700 Series is designed to measure temperatures from -75
°C
to 540
°C
[-100
°F
to 1000
°F]
with high accuracy.
These fully-assembled elements are ready-to-use in probe assemblies, without the need for fragile splices to extension
leads.
These products are manufactured using a thin layer of platinum deposited on an alumina substrate and are laser trimmed
to a resistance interchangeability of a standard ±0.2% (±0.5
°C
accuracy) or optional ±0.1% (±0.3
°C
accuracy). The sensor
chip is then glassed, wired and potted or ceramic fired to result in a cylindrical alumina package with either TFE Teflon
®
- or
fiberglass-insulated lead wires.
Key Features
•
•
•
•
•
•
•
•
•
•
Wide temperature range
Interchangeable
Accurate
Linear resistance vs temperature
Fast response
Laser trimmed
Ceramic case material
TFE Teflon
®
or fiberglass leadwires
Multiple small sizes
Ready-to-use, fully assembled elements
Potential Applications
Temperature sensing for monitoring, compensation and regulation in:
InduStrIaL
•
•
•
•
•
•
•
•
HVAC equipment
Instrument and probe assemblies
Process control
Motor windings and bearings
Battery packs
Environmental chambers
Ovens and kilns
Drill holes in large objects
MEdICaL
•
Autoclaves
aErOSPaCE/dEFEnSE
•
•
Aircraft
Space vehicles
Wide temperature range • interCHangeaBLe • aCCurate
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Thin Film Platinum RTDs, HEL-700 Series
table 1. Specifications
Characteristic
Alpha:
R
0
= 1000 Ω
R
0
= 100 Ω
Temperature range:
TFE Teflon
fiberglass
Temperature accuracy:
R
0
±0.2% trim (standard)
R
0
±0.1% trim (optional)
Base resistance and interchangeability, R
0
±∆R
0
:
R
0
±0.2% trim (standard)
R
0
±0.1% trim (optional)
Linearity:
-40 °C to 125 °C
-75 °C to 540 °C
Time constant
Operating current
Stability
Self heating
Insulation resistance
Construction/material:
case
Teflon -insulated leads
fiberglass-insulated leads
®
Condition
0 °C
Parameter
0.00375 Ω/Ω/°C
0.00385 Ω/Ω/°C
-70 °C to 260 °C [-94 °F to 500 °F]
-75 °C to 540 °C [-100 °F to 1000 °F]
±0.5°C or 0.8% of temperature, whichever is greater
±0.3°C or 0.6% of temperature, whichever is greater
1000 Ω ±2 Ω
1000 Ω ±1 Ω
±0.1% of full scale
±2.0% of full scale
<0.5 s for 0.086 in O.D.
<1.0 s for 0.086 in O.D.
2 mA max. minimal self heating errors of 1 °C;
1 mA recommended
<0.25 °C /year; 0.05 °C /5 years
<15 mW/°C typ. for 0.086 in O.D.
>50 MΩ
—
—
0 °C
—
water at 3 ft/s
still water
—
occupied environments
—
50 Vdc at 25 °C
—
high purity alumina
nickel-coated stranded copper, epoxy potting
nickel-coated stranded copper, ceramic potting
table 2. Constant Values (β = 0 and C = 0 for t > 0 °C)
Constant
Alpha α
(°C
-1
)
Delta
δ
(°C)
Beta
β
(°C)
A (°C
-1
)
B (°C
-2
)
C (°C
-4
)
1000 Ω
0.00375 ±0.000029
1.605 ±0.009
0.16
3.81 x 10
-3
-6.02 x 10
-7
-6.0 x 10
-12
100 Ω
0.003850 ±0.000010
1.4999 ±0.007
0.10863
3.908 x 10
-3
-5.775 x 10
-7
-4.183 x 10
-12
Where:
R
T
= Resistance (Ω) at temperature T (°C)
R
0
= Resistance (Ω) at 0 °C
T = Temperature (°C)
A = α
+ αδ B
=
-αδ
C
T<0
=
-αβ
100
4
100
100
2
Functional Behavior
R
T
= R
0
(1 + AT + BT
2
- 100CT
3
+ CT
4
)
CAUTION
PRODUCT DAMAGE
•
Ensure proper ESD (Electrostatic Discharge) precautions
are followed when handling this product.
Failure to comply with these instructions may result in
product damage.
sensing.honeywell.com
3
Thin Film Platinum RTDs, HEL-700 Series
table 3. accuracy vs temperature
tolerance
temperature
(°C)
Standard trim
(±0.2%)
±∆r
1
(Ω)
2.9
2.0
2.9
5.6
8.2
11.0
12.5
15.1
±∆t
(°C)
0.8
0.5
0.8
1.6
2.4
3.2
4.0
4.8
Optional trim
(±0.1%)
±∆r
1
(Ω)
2.4
1.0
2.2
4.3
6.2
8.3
9.6
10.4
±∆t
(°C)
0.6
0.3
0.6
1.2
1.8
2.5
3.0
3.3
1
table 4. nISt Calibration
temperature
(°C)
-100
0
100
200
300
400
500
600
Standard temperature Point
(±∆t (°C))
1
0.5
0.03
0.4
0.8
1.2
1.6
2.0
2.6
2
0.27
0.03
0.11
0.02
0.33
0.5
0.8
1.2
3
0.15
0.03
0.07
0.08
6.2
8.3
9.6
10.4
-100
0
100
200
300
400
500
600
1
1000 Ω RTD. Divide ∆ by 10 for 100 Ω RTD.
NIST-traceable calibration provides resistance readings at 1, 2 or 3
standard temperature points to yield a resistance versus temperature
curve with 10x better accuracy.
Figure 1. resistance vs temperature
3500
350
300
250
RTD Resistance ( )
3000
2500
2000
1500
1000
500
0
100
RTD Resistance ( )
1000 , 375 alpha
100 , 385 alpha
200
150
100
50
0
HEL-700 Series
Temperature (°C)
Thin Film RTDs Product Nomenclature
-100
0
100
200
300
1000
400
500
600
Figure 2. nomenclature and Ordering Guide
For example, a
HEL-705-U-0-12-C1
part number defines an HEL-700 Series Thin Film RTD with two, 28 gauge
TFE Teflon
®
insulted leadwires, an alpha of
1000
: 0.00375
/ /°C, a standard ±0.2% trim resistance, 12 inch leadwires, and a NIST calibration report at 0 °C.
HEL-
Product Series
HEL-700
Series
Thin Film
Platinum RTDs
705-
Leadwire Insulation Material,
Gauge and Number
®
705
TFE Teflon , 28 gauge;
U-
Resistance and
Alpha
0-
Resistance
Trim
12-
Leadwire
Length
C1
NIST Calibration Report
1000
: 2-wire, 100
: 2-wire
U
1000 : 0.00375 / /°C
T
(DIN Standard)
100
: 0.00385
/ /°C
0
Standard: ±0.2%
1
Optional: ±0.1%
12
12 inches
00
none
C1
at 0 °C
C2
at 0 °C and 100 °C
C3
at 0 °C, 100 °C and 260 °C
707
1000 : 2-wire, 100 : 2-wire
711
1000 : 2-wire, 100 : 3-wire
712
1000 : 2-wire, 100 : 3-wire
716
1000 : 2-wire, 100 : 3-wire
717
1000 : 2-wire, 100 : 3-wire
fiberglass, 24 gauge;
TFE Teflon
®
, 24 gauge;
fiberglass, 28 gauge;
TFE Teflon
®
, 28 gauge;
fiberglass, 28 gauge;
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sensing.honeywell.com
Thin Film Platinum RTDs, HEL-700 Series
Figure 3. all available Standard Configurations
teflon
®
-Insulated Leadwires
Fiberglass-Insulated Leadwires
HEL-705
2-wire
only
HEL-707
2-wire
only
HEL-711
HEL-712
2
2-wire
2
3-wire
HEL-716
2
2-wire
2
3-wire
HEL-717
2
2-wire
2
3-wire
3
Figure 4. dimensional drawings (For reference only: mm [in].)
HEL-705
4,83
[0.187]
2
2-wire
2
3-wire
305
[12]
2-wire
only
2,29
[0.086]
HEL-707
6,35
[0.25]
305
[12]
2-wire
only
2,29
[0.086]
HEL-711, HEL-712
15,24
[0.60]
305
[12]
2
2-wire
2,79
[0.11]
15,24
[0.60]
305
[12]
2
3-wire
HEL-716, HEL-717
2,79
[0.11]
15,24
[0.60]
305
[12]
2
2-wire
3,30
[0.13]
15,24
[0.60]
305
[12]
2
3-wire
3,30
[0.13
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5
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