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Brand: Murphy
Murphy 10705147 Single-Port and 10705146 Dual-Port Exhaust Pyrometer for Diesel Engines
Description
Exhaust gas temperature gauges for single and V-type diesel engines
The Murphy 10705147 single-port pyrometer and the 10705146 dual-port pyrometer monitor exhaust temperatures in all types of engines. The dual-port version can monitor each bank of a V-type engine so the two readings can be compared at all times. Both have an easy-to-read illuminated dial with Fahrenheit and Celsius scales and need no outside power apart from the dial lighting.
Enovation Controls explains that excessive exhaust temperature is a major damaging factor for engines, caused by an upset fuel and air ratio such as over throttling, a dirty air cleaner, different fuels, a malfunctioning fuel system, a change of altitude or an out-of-tune engine. A pyrometer shows the condition before serious damage occurs. The gauges suit stationary or mobile engines, power units, agricultural and construction equipment, and marine and trucking applications.
Technical specifications
Values are from Enovation Controls bulletin 9011.
| Parameter | Specification |
|---|---|
| Dial scale, single (10705147) | 300 to 1300 F (150 to 700 C) |
| Dial scale, dual (10705146) | 300 to 1200 F (150 to 649 C); Celsius-only dials available |
| Dial sweep | 100 degrees, both models |
| Accuracy | 2% of full scale |
| Illumination | Internal, 12 or 24 VDC |
| Bezel | Polished stainless steel; black bezel available as a special order |
| Case | PVC; sealed housing |
| Pointers | Fire orange |
| Calibration | Permanently calibrated at 2/3 scale, with ambient temperature compensation |
| Mounting | Flush type, on any plane |
| Part numbers | 00000956 for 10705147 single pyrometer; 00000819 for 10705146 dual pyrometer |
| Thermocouples | 00000818: grounded type K, 3/8 NPT; 00003488: ungrounded type K, 1/4 NPT |
| Thermocouple construction | Type K (NiCr/Ni) solid wire; fusion welded hot junction; Inconel protecting tube closed by heliarc melt down; Q-glass insulation with stainless steel overbraid |
| Wire lead assembly | 00000817: 14 ft (4.27 m) PVC covered, non-shielded, 18 AWG (1.0 mm2) extension with mating plugs |
Thermocouples, adaptors and installation
The pyrometer is sold as the gauge head, with the type K thermocouples as accessories. A thermocouple can be mounted in the engine manifold or in an exhaust port of 2 to 3-1/2 in (51 to 89 mm) diameter. On turbocharged engines it mounts between the engine and the turbo. Adaptors are listed for 1/8 NPT (00003577), 1/4 NPT (00003450), 3/8 NPT (00003578) and 1/2 NPT (00003579).
The wire lead assembly is a 14 ft extension with mating connections for both thermocouples. The bulletin says the extension can reach 100 ft (30.48 m) using 18 AWG (1.0 mm2) or larger copper wire at the gauge head, with a heat shrinkable sleeve supplied to insulate the terminals after installation.
Choosing single or dual and checking the setup
Use the single-port 10705147 where one exhaust temperature is enough, for example on an in-line engine or at the turbo inlet. Use the dual-port 10705146 on a V-type engine to watch both banks. Note the different top of scale: 1300 F for the single and 1200 F for the dual.
Order the thermocouple type and thread to suit the exhaust manifold, add the lead assembly if the gauge is mounted away from the engine, and state 12 or 24 VDC for the dial light. The bulletin lists benefits such as longer engine life, better fuel economy and less lube oil dilution, but those are manufacturer statements for general use. Enovation Controls lists this product family on its Legacy Products page, which describes those items as less popular or outdated but still available for purchase. Confirm current availability and any replacement part before ordering.
Documents and quotation
The attached bulletin 9011 (revision 2014/11/13) is the source for the values above. Seven Star LLC supplies Murphy products as an independent supplier in Muscat. Send the model, engine type, thermocouple thread and quantity with your enquiry. More gauges are listed under temperature instrumentation.
Datasheets & Documents
- Datasheet Murphy exhaust pyrometers 10705146 and 10705147 bulletin 9011 (rev. 2014/11/13) Download
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About brand
Murphy is an American brand of engine and equipment protection controls that began in 1939 in Tulsa, Oklahoma. Founder Frank W. (Pat) Murphy combined an indicating gauge with a switch that stops an engine on low oil pressure or high coolant temperature, first installed on unattended oilfield engines. That SWICHGAGE remains the brand's best-known product.
Seven Star LLC is an independent supplier in Muscat. We list selected Murphy gauges, switches and controllers for engines, generator sets, pumps and compressors in Oman and the GCC.
Murphy company profile
| Founded | 1939, Tulsa, Oklahoma, USA, by Frank W. (Pat) Murphy |
|---|---|
| First product | The SWICHGAGE, a gauge with a built-in shutdown switch |
| Original market | Unattended engines in oilfields |
| Product families | SWICHGAGE gauges and switches, TATTLETALE annunciators, PowerView displays, engine and compressor control panels, liquid level switches and vibration switches |
Milestones
- 1939: Pat Murphy develops the Murphy safety switch and starts FW Murphy in Tulsa.
- Today: SWICHGAGE gauges are still among Murphy's best-selling products.
Murphy product series
The classic range includes the 20P and 25P pressure Swichgage and the 20T and 25T temperature Swichgage, gauges with built-in switch contacts for alarm and shutdown, B-Series Murphygage gauges, the L150 and EL150K1 level Swichgage, ESPS-100 and ESTS senders and switches, Tattletale annunciators and magnetic switches, the VS2 shock and vibration switch, the MP3298 magnetic pickup and exhaust pyrometers for diesel engines.
Newer products include the PowerCore MPC-20 configurable engine controller and the PowerView 780B 7-inch display with CAN J1939 communication, and the Sentinel 300P battery charger keeps starting batteries charged.
Where Murphy products are used
Gas compressor packages, engine-driven pumps and fire pumps, generator sets, irrigation and dewatering pumps and mobile equipment, where the instruments protect the engine against low oil pressure, high temperature, overspeed and vibration.
Murphy products we list
Ordering Murphy parts: what we need
Send the full model code, range or scale, thread, voltage and any options. Because many Murphy parts are legacy designs, we check configuration and current availability against Enovation Controls documents before quoting.
Facts checked against the Murphy history published by Enovation Controls, October 2026.
Browse Murphy products by category: Pressure Instrumentation, Vibration Monitoring, Controllers & Data Acquisition, Level Instrumentation, Temperature Instrumentation.
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Frequently Asked Questions
What is the difference between the 10705147 and the 10705146?
The 10705147 is a single-port pyrometer with a 300-1300 F dial. The 10705146 is a dual-port pyrometer for V-type engines with a 300-1200 F dial.
Does the pyrometer need power?
Only for the dial light, which is internal 12 or 24 VDC. The temperature reading needs no outside power.
Which thermocouples are used?
Type K thermocouples, 00000818 grounded 3/8 NPT or 00003488 ungrounded 1/4 NPT, with adaptors for 1/8, 1/4, 3/8 and 1/2 NPT.
How accurate is it?
The bulletin states 2% of full scale.
Is it a legacy product?
Enovation Controls lists exhaust pyrometers on its Legacy Products page as still available for purchase.
Reviews
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