FW MURPHY SDB500 SDB Series Temperature Gage Instructions
- June 13, 2024
- FW MURPHY
Table of Contents
Installation of Direct Mount Temperature Gage
with Adjustable Limit Switch
sect. 10 00-02-0043
rev. 2020/05/19
- Products covered by this bulletin comply with EMC Council directive 89/336/EEC regarding electromagnetic compatibility except as noted.
SDB500 SDB Series Temperature Gage
SDB Series (For Gas Compressor Cylinder Discharge Temperatures)
The SDB Series are direct-mounting temperature devices. They provide an
accurate direct-reading gage with an adjustable limit switch to activate
alarms and/ or shutdown. A knob on the front of the instrument allows you to
adjust the limit switch trip point. Pointer movement is actuated by a bi-
metallic sensing element.
Models SDB500, SDB501 and SDB500EX have a temperature range of 100° to 500° F
(40° to 260° C). SDB500EX enclosure is explosion-proof and CSA listed for
Class I, Group C and D hazardous locations.
The SDB1000 has a temperature range of 200° to 1000° F (100° to 500° C).
The most common use of the SDB Series is to monitor gas compressor
temperatures. Engine exhaust temperature can also be monitored to indicate
overloading or lean fuel mixtures, or use the SDB to help coordinate loads on
twin-engine installations.
Specifications
Temperature Ranges:
SDB500, SDB500EX, SDB501: 100° to 500° F (40° to 260° C)
SDB1000: 200° to 1000° F (100° to 500° C)
Sensing Bulb Material and Size: 304 stainless steel;
1/2 in. dia. x 4 in. insertion depth (13 x 102 mm)
Maximum Bulb Pressure: 285 psi (1.97 MPa) [19.7 bar] at 625° F (329° C)
NOTE: Use of a thermowell is recommended.
Process Connection : 1/2 NPTF; 3/4 NPT adapter available
Sensing Element: High torque bi-metal element in heliarc welded stainless
steel bulb
Contact Rating: SDB500, SDB501 and SDB1000: 2 A @ 30 VAC
SDB500EX: 2 A @ 120 VAC
Limit Contact Adjustment: By knob through full range
Maximum Unit Temperature:
SDB500, SDB500EX, SDB501: 625° F (329° C)
SDB1000: 1250° F (677° C)
Case Material: SDB501: Die-cast aluminum; SDB500, SDB1000,
SDB500EX: Sand-cast aluminum
Accuracy: ± 3% of full scale;
NOTE: All models are calibrated for use with a thermowell. Specify when a
thermowell is NOT to be used when ordering.
Wire: 18 AWG (1.0 mm2). See Dimensions for lengths.
Dial: Black print on stainless steel Dials are scaled in degrees
Fahrenheit and Celsius.
Approximate Shipping Weight:
SDB501: 1 lb. 4 oz. (0.57 kg)
SDB500 and SDB1000: 2 lb. (1.0 kg)
SDB500EX: 2 lb. 5 oz. (1.05 kg)
Approximate Shipping Dimensions:
SDB501: 8-1/4 x 4-1/4 x 4-1/2 in. (210 x 108 x 114 mm)
SDB500 and SDB1000: 8-1/4 x 4-1/4 x 4-1/2 in.
(210 x 108 x114 mm)
SDB500EX: 9 x 5-1/2 x 6 in. (229 x 140 x 152 mm)
Dimensions
SDB500, SDB500EX and SDB1000
SDB501
Basic Operation
SDB500, SDB501 and SDB1000: When the indicating pointer on the SDB
touches the adjustable switch contact, a one-wire-to-ground circuit is
completed to shut down the equipment and/or actuate audible or visual alarms.
Proper relays or annunciators (with magnetic switches) must be incorporated
into the system.
SDB500EX : When the temperature rises to the preset trip point, the
pointer engages an internal SPDT snap-switch to close/open circuits.
Wiring Diagrams
In order to consistently bring you the highest quality, full-featured
products, we reserve the right to change our specifications and designs at any
time.
FW MURPHY product names and the FW MURPHY logo are proprietary trademarks.
This document, including textual matter and illustrations, is copyright
protected with all rights reserved. (c) 2020 FW MURPHY. A copy of our typical
warranty may be viewed or printed by going to
www.fwmurphy.com/warranty.
Installation
WARNING: Before beginning installation of this FW Murphy product:
- Disconnect ALL electrical power to the machine.
- Make sure the equipment CANNOT operate during installation.
- Follow all safety warnings of the machine manufacturer.
- Read and follow all installation instructions.
IMPORTANT: The preferred mounting for the SDB Series units is with the face dial in the vertical position.
- Thermowell use is recommended – only use FW Murphy thermowells. Install thermowell using pipe sealant, and make sure insertion depth is appropriate for the application.
- Apply a small amount of high temperature, heat transfer grease on the tip of the element (do NOT pack the thermowell with grease) before installing.
- Tighten the SDB using the hex for the wrench only. Do NOT use the housing. Use backup wrench(s) as necessary.
- Anti-seize compound is applied to housing/cover threads of the SDB units, re-apply as necessary.
- Use anti-seize compound on conduit threads.
- Explosion-proof models require explosion-proof conduit seals, for installation refer to NEC and/or applicable codes.
- The SDB is not intended for high cycle applications.
- Do NOT exceed contact ratings.
- Non-explosion-proof models are simple apparatus and can be used with non-incendive or intrinsically safe circuits in hazardous areas, refer to NEC and/or applicable codes.
Optional Thermowells
Thermowells (separable sockets) are available to facilitate maintenance of a temperature instrument and to protect the temperature sensing bulb from extreme amounts of system pressure. For system pressures exceeding 285 psi (1.97 MPa) [19.7 bar] at 625° F (329° C) an optional thermowell is recommended for use with the SDB series. The thermowell protects the SDB bulb from system pressures up to 3000 psi (20.68 MPa) [206.8 bar] at 300° F (149° C). Two thermowell options are available: 1/2 NPT and 3/4 NPT. Thermowells can be ordered with the SDB Series instrument or ordered separately.
| Part | Model and Description | Notes |
|---|---|---|
| 10000245 | Lens, Assembly SDB500EX | Gage Part |
| 10050025 | Thermowell used with SDB |
Rated 3000 psi @ 300°F (20.7 MPa @ 149 °C)
Material is 304 Stainless Steel
A. 4.800 in. (122 mm) E. 0.660 in. (17 mm)
B. 4.490 in. (114 mm) F. 1/2-14 NPT
C. 3.300 in. (84 mm) G. 1.125 Hex
D. 0.510 in. (13 mm) H. 1/2-14 NPT|
10050311| Thermowell used with SDB
Rated 3000 psi @ 300°F (20.7 MPa @ 149 °C)
Material is 304 Stainless Steel
A. 4.800 in. (122 mm) E. 0.810 in. (21 mm)
B. 4.490 in. (114 mm) F. 3/4-14 NPT
C. 3.300 in. (84 mm) G. 1.125 Hex
D. 0.510 in. (13 mm) H. 1/2-14 NPT|
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