DISPLACEMENT
DCTH Series DC to DC LVDT Displacement Transducer
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High cycle life
Stainless steel
High accuracy
High resolution
Voltage / 4-20mA output
These transducers are for displacement / position measurement. They make an accurate position
measurement of the movement of the armature (the sliding part) relative to the body of the displacement
transducer.
This transducer uses the Linear Variable Differential Transformer (LVDT) principle which means that it is
probably the most robust and reliable position sensor type available. The strength of the LVDT sensor's
principle is that there is no electrical contact across the transducer position sensing element which for the user
of the sensor means clean data, infinite resolution and a very long life.
Our DC to DC LVDT transducer has all of the benefits of the LVDT sensor principle with the added
convenience of built-in LVDT electronics enabling a dc supply and dc output. As an option we can offer a 420mA 2 wire connection to the transducer on some models.
This series of displacement transducer is available as either an unguided, captive or spring return version.
Captive guided version.
20.6mm
23mm
M5x0.8 / 11mm
D3
L
Type
Range
DCTH500C
DCTH1000C
DCTH2000C
DCTH3000C
DCTH4000C
DCTH6000C
DCTH8000C
DCTH10000C
DCTH15000C
DCTH18500C
±12.5mm
±25mm
±50mm
±75mm
±100mm
±150mm
±200mm
±250mm
±375mm
±470mm
20141105
0
-
+
Our captive guided displacement
transducer has bearings to guide the
armature inside the measurement
sensor. Captive LVDTs are for position
measurement applications where
guidance may be poor and end bearings
may be required.
M5x0.8
TF
X
Linearity error (%
F.S.)
<±0.5/±0.25/±0.1
<±0.5/±0.25/±0.1
<±0.5/±0.25/±0.1
<±0.5/±0.25/±0.1
<±0.5/±0.25/±0.1
<±0.5/±0.25
<±0.5/±0.25
<±0.5/±0.25
<±0.5
<±0.5
L
X
D3
194mm
222mm
336mm
448mm
494mm
684mm
875mm
1067mm
1473mm
1740mm
38mm
63mm
76mm
114mm
127mm
178mm
254mm
305mm
406mm
508mm
4.75mm
4.75mm
4.75mm
4.75mm
4.75mm
4.75mm
4.75mm
4.75mm
4.75mm
6.00mm
1/3
Total
weight
340g
398g
511g
625g
767g
1.0kg
1.4kg
1.7kg
2.2kg
2.6kg
TF
15mm
15mm
15mm
15mm
15mm
15mm
32mm
27mm
19mm
27mm
Inward overtravel
10mm
13mm
10mm
24mm
8mm
12mm
22mm
34mm
13mm
5mm
Outward overtravel
12mm
10mm
14mm
15mm
14mm
17mm
25mm
35mm
13mm
33mm
www.rdpe.com/ex/dcth.pdf
Unguided version.
DCTH100 to DCTH400
0
-
+
20.6mm
2.0mm
2.54mm
L
M3x0.5
TF
2mm
On our unguided LVDTs the armature
assembly is a separate component, to
make a measurement the user must
guide the armature inside the body
without touching the sides. Unguided
position measurement transducers are
appropriate where external guidance is
available and give truly non-contact
operation
X
DCTH500 to DCTH8000
9mm
0
-
+
20.6mm
5.97mm
6.8mm
L
Type
Range
DCTH100
DCTH200
DCTH300
DCTH400
DCTH500
DCTH1000
DCTH2000
DCTH3000
DCTH4000
DCTH6000
DCTH8000
±2.5mm
±5mm
±7.5mm
±10mm
±12.5mm
±25mm
±50mm
±75mm
±100mm
±150mm
±200mm
M5x0.8
TF
4.75mm
X
Linearity error (%
F.S.)
<±0.5/±0.25/±0.1
<±0.5/±0.25/±0.1
<±0.5/±0.25/±0.1
<±0.5/±0.25
<±0.5/±0.25/±0.1
<±0.5/±0.25/±0.1
<±0.5/±0.25/±0.1
<±0.5/±0.25/±0.1
<±0.5/±0.25/±0.1
<±0.5/±0.25
<±0.5/±0.25
L
X
Total weight
64mm
64mm
64mm
64mm
175mm
203mm
317mm
430mm
475mm
666mm
856mm
33mm
33mm
33mm
33mm
43mm
69mm
81mm
119mm
132mm
183mm
259mm
74g
74g
74g
74g
213g
270g
369g
497g
625g
852g
1.3kg
Spring return version.
DCTH100AG to DCTH400AG
0
+
20.6mm
-
L
Armature
weight
1.4g
1.8g
1.8g
1.9g
17g
23g
37g
55g
71g
100g
140g
TF
18mm
18mm
18mm
18mm
15mm
15mm
15mm
15mm
15mm
15mm
29mm
Inward overtravel
11.6mm
9.0mm
6.5mm
3.9mm
16mm
22mm
16mm
29mm
16mm
16mm
27mm
Our spring displacement transducer has
bearings to guide the armature inside
the measurement sensor and a spring
which pushes the armature to the fully
out position. Spring return LVDTs are
appropriate where it is not possible to
connect the transducer armature to the
moving component being measured.
4.0mm
8.0mm
36mm
X
DCTH500A to DCTH3000A
9mm
20.6mm
-
0
+
4.75mm
L
Type
Range
DCTH100AG
DCTH200AG
DCTH300AG
DCTH400AG
DCTH500A
DCTH1000A
DCTH2000A
DCTH3000A
±2.5mm
±5mm
±7.5mm
±10mm
±12.5mm
±25mm
±50mm
±75mm
20141105
X
Linearity error (%
F.S.)
<±0.5/±0.25/±0.1
<±0.5/±0.25/±0.1
<±0.5/±0.25/±0.1
<±0.5/±0.25
<±0.5/±0.25/±0.1
<±0.5/±0.25/±0.1
<±0.5/±0.25/±0.1
<±0.5/±0.25/±0.1
L
X
64mm
64mm
64mm
64mm
182mm
210mm
324mm
436mm
12mm
13mm
18mm
22mm
38mm
63mm
75mm
114mm
2/3
Total
weight
83g
83g
83g
83g
227g
284g
398g
511g
Spring
force at X
1.0N
1.0N
1.5N
1.8N
1.3N
2.0N
1.8N
6.0N
Spring
Inward
Outward
rate
over-travel over-travel
0.9N/cm
2.2mm
1.3mm
0.8N/cm
0.3mm
1.3mm
0.6N/cm
1.4mm
1.3mm
0.8N/cm
1.3mm
1.3mm
0.2N/cm
1.0mm
13mm
0.3N/cm
3.0mm
10mm
0.2N/cm
8mm
14mm
0.4N/cm
15mm
15mm
www.rdpe.com/ex/dcth.pdf
Specification
V output
4-20mA output (>=±12.5mm)
Both outputs
Supply voltage (dual)
Supply voltage (single, must be floating)
Change in output for change in supply
Output load
Output ripple
Electrical output bandwidth
Output impedance
Operating temperature range
Supply voltage
Max loop resistance
Output ripple
Electrical output bandwidth
Operating temperature range
Temperature coefficient (zero)
Temperature coefficient (span)
Electrical termination
Output details (outputs 1 and 2 selected using different connections)
Option code
Note
- position
Standard
Output 1
0V
Standard
Output 2
-5V (+0% - 5%)
TM0627
Output 1
10V (+0% - 5%)
TM0627
Output 2
+5V (+0% - 5%)
TM0321A
>=±12.5mm
4mA
TM0321B
>=±12.5mm
20mA
±12V to ±20V dc, 30mA
24V to 40V dc, 30mA
5mV/V
10kOhms
30mV (peak-to-peak)
200Hz
2 Ohms
-40°C to 80°C
12V to 36V dc
(Supply voltage-11) x 50 Ohms
50uA (peak-to-peak)
200Hz
-10°C to 70°C
±0.01% F.S. /°C (typical)
±0.03% F.S. /°C (typical)
2m (integral cable) Longer available to order.
0
5V
0V
5V
0V
12mA
12mA
+ position
10V (+0% - 5%)
+5V (+0% - 5%)
0V
-5V (+0% - 5%)
20mA
4mA
All dimensions and specifications are nominal.
Due to our policy of on-going development, specifications may change without notice. Any modification may affect some
or all of the specifications for our equipment.
USA & Canada
RDP Electrosense
2216 Pottstown Pike
Pottstown, PA 19465
USA
Tel: 610-469-0850
Tel: 800-334-5838
Fax: 610-469-0852
Email: [email protected]
20141105
Rest of the world
RDP Electronics Ltd
Grove Street, Heath Town
Wolverhampton, West Midlands, WV10 0PY
United Kingdom
Tel: +44 1902 457512
Fax: +44 1902 452000
Email: [email protected]
URL: www.rdpe.com
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www.rdpe.com/ex/dcth.pdf