Dwyer Series TDMT User manual
- Category
- Measuring, testing & control
- Type
- User manual
Please read carefully: No liability can be accepted for damage
caused by improper use of the TDMT.
The Series TDMT Flow Meter is for use in industrial applications, and can be
easily installed virtually non-intrusively into any pipe. This non-intrusive installation
allows flow-sensing without obstruction of the pipe diameter. It is completely
encapsulated in epoxy resin and is compact, rugged, shock and vibration resistant.
It provides proven reliability and long-term stability, even under the harshest
environmental conditions. The TDMT is made of stainless steel with a titanium
option making it resistant to aggressive media. In addition to its small and compact
size, the TDMT also comes with a choice of a 1˝ unit with 1˝ NPT union nut or a 1-
1/4˝ unit with 1-1/4˝ union nut, as well as available extensions that can be used for
pipes sized up to 10˝ in diameter. With an optional temperature output, this meter
provides the user with a very broad range of usage. When trying to decide on the
correct length, use the 1/7th law (the TDMT’s probe length needs to be 1/7th of the
pipe diameter).
PRINCIPLES OF OPERATION
The TDMT operates according to a new calorimetric principle, allowing for a wide
measuring range. This meter also provides a very short integration time, even at
low flow rates, making it ideal for quick control loops. Its measurement accuracy at
low flow rates is considerably better than all other competing measurement
devices.
Series TDMT Thermal Dispersion Meter
Specifications - Installation and Operating Instructions
Bulletin F-TDMT
TM
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
UNPACKING
Remove the TDMT from the shipping carton and inspect for damage. If damage is
found, notify the carrier immediately.
INSTALLATION
Insure that the process fluid is compatible with the wetted materials.
Do not exceed the maximum device ratings.
Insure that the system is properly installed BEFORE removing this device
or other objects from the system.
SPECIFICATIONS
Service: Water, oil, compatible liquids, paste, glue, sludge and grease.
Wetted Materials: 316 SS, optional titanium.
Flow Range:
Min: 0 to 0.66 ft/s (0 to 20 cm/s);
Max: See model chart.
Temperature Range: (For optional output only) 32 to 212°F (0 to 100°C).
Accuracy: <3% of full range.
Repeatability: <1%.
Response Time: 10 seconds.
Temperature Limits:
Process: 14 to 176°F (-10 to 80°C);
Ambient: 14 to 140°F (-10 to 60°C).
Pressure Limits: 435 psi (30 bar).
Process Connections:
1˝ unit: 1˝ NPT union nut;
1-1/4˝ unit: 1-1/4˝ NPT union nut.
Output Signal: 4 to 20 mA for flow, optional 4 to 20 mA for temperature.
Power Requirements: 24 VDC ±10%.
Resistive Load: 0 to 600 Ω.
Current Consumption: Approx. 100 to 200 mA (max. flow).
Electrical Connection: 6.5 ft (2 m) moulded oilflex cable with three 21 AWG (0.5
sq mm) wires.
Enclosure Rating: NEMA 4X (IP65).
Shipping Weight:
1˝ unit: 5.6 oz (158.76 g);
1-1/4˝ unit: 13.4 oz (379.88 g).
TOP
UNION NUT
(INCLUDED)
SIDE
ZERO POINT
POTENTIOMETER
INDICATING
LED
MEASUREMENT RANGE
POTENTIOMETER
Example
Series
Base Type
Wetted Material
Range
Fitting
Extension
Output
TDMT
TDMT
W
W
L
S
S
T
1
1
2
3
1
1
2
0
0
1
1
1
2
TDMT-WS-1101
Thermal Dispersion Flow Meter
Water
Oil
316 SS
Titanium
0 to 6.56 ft/s (0 to 2 m/s)
0 to 9.84 ft/s (0 to 3 m/s)
0 to 13.12 ft/s (0 to 4 m/s)
1˝ unit with 1˝ NPT union nut
(up to 4˝ inner pipe diameter)
1-1/4˝ unit with 1-1/4˝ NPT union nut
(4˝ to 10˝ inner pipe diameter)
None
+7.87˝ (+ 200 mm)
1 flow output
1 flow output plus 1 temperature output
(only available with 1˝ NPT unit)
4-5/16
[109.50]
1-17/64
[32.00]
1-1/2
[38.00]
35/64
[14.00]
F-TDMT:SSS-1000 8/9/10 11:53 AM Page 1
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
©Copyright 2010 Dwyer Instruments, Inc. Printed in U.S.A. 7/10 FR# 443842-00
INSTALLATION
Union nut: 1-1/4˝ NPT / 1˝ NPT
Spanner gage: 2˝ / 1.5˝
Potentiometer, 18 turn, endless
Figure 2
POSITIONING
Rear view of TDMT
Figure 3
CONNECTION DIAGRAM
Figure 4
ADDITIONAL TEMPERATURE OUTPUT CONNECTION DIAGRAM
Figure 5
1.0 Items delivered
1.1 Thermal Dispersion Meter: TDMT
1.2 Union nut: 1-1/4˝ NPT / 1” NPT SS
1.3 O-ring: 1-1/4˝ NPT / 1” NPT
1.4 Miniature flathead screwdriver for adjustment
2.0 Installation Instructions
2.1 Installation depth: 1/7x inner pipe diameter with a minimum of 0.2” (5 mm).
2.2 Orientation to flow: See Figure 3.
2.3 Fitting position: Preferably in vertical pipes with ascending flow or in
horizontal pipes with TDMT in horizontal position. For optimal flow, straight pipes
should be 5 to 7x inner diameter of the pipe before, and 3 to 5x inner diameter of
the pipe after the TDMT.
2.4 Mounting: Push O-ring over the sensing surface and housing to the flange.
Insert TDMT into the fitting, which is welded onto the pipe and hold in place with
the union nut. Ideal sealing is achieved by a fitting of a 0.16 to 0.2” (4 to 5 mm) wall.
2.5 Initial operation: Connect TDMT to 24V DC according to connection diagram
Figure 4, and wait approximate 2 minutes before starting adjustment. The TDMT
has been preset under test pipe conditions to a flow range specified to each model
(see model chart). A customer's plant signal may vary depending on individual
mounting and medium conditions. Output current is 4 to 20 mA. If re-adjustment is
required, please refer to point 3.
3.0 Adjustment Procedure
3.1 Zero point adjustment in stationary medium: Adjust zero point
potentiometer after 2 minutes, so that Ia ≈ 4 mA, i.e:
at Ia > 4 mA turn potentiometer to the left,
at Ia < 4 mA turn potentiometer to the right.
3.2 Measuring range adjustment at maximum flow: Measuring range is
adjustable from 0 to 0.66 ft/s (0 to 20 cm/s) to calibrated range according to the
model (see model chart). Accelerate flow of the medium to a point, where the TDMT
should give an output signal of 20 mA and wait a minimum of 2 minutes. Turn range
potentiometer until Ia = 20 mA (to the left Ia will be greater, to the right Ia will be
smaller). The color of the LED will change from green (Ia ≤ 20 mA) to red
(exceeding measuring range).
3.3 Fine adjustment of zero point: After at least 3 minutes of flow standstill, turn
zero point slightly, so that Ia is just 4 mA (turning direction as in 3.1).
3.4 Repeat adjustment according to 3.2 and 3.3 until the zero point (4 mA) or
maximum range setting (20 mA) remains constant.
MAINTENANCE & REPAIR
Inspect and clean wetted parts with water or damp cloth at regular intervals.
Disassembly or modifications made by the user will void the warranty and could
impair the continued safety of the product. If repair is required obtain a Return
Goods Authorization (RGA) number and send the unit, freight prepaid, to the
address below. Please include a detailed description of the problem and conditions
under which the problem was encountered.
Dwyer Instruments, Inc.
Attn: Repair Department
102 Indiana Hwy 212
Michigan City, IN 46360
FLOW DIRECTION
ZERO POINT
POTENTIOMETER
INDICATING LED
MEASUREMENT RANGE
POTENTIOMETER
+
-
4-20 MA CURRENT OUTPUT
1 BROWN
3 BLACK
2 BLUE
LOAD MAX. 600
TDMT
V
+
-
4-20 MA CURRENT OUTPUT
1 BROWN
3 BLACK FLOW
2 BLUE
EACH
LOAD
MAX. 600
TDMT
4 WHITE TEMP.
VDC
F-TDMT:SSS-1000 8/9/10 11:53 AM Page 2
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Dwyer Series TDMT User manual
- Category
- Measuring, testing & control
- Type
- User manual
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