IDEAL INDUSTRIES 61-685 operating instructions Emissivity

Operating the Thermometer

To measure temperature, aim the thermometer at an object and pull the trigger key. Be sure to consider the distance to spot size ratio. The laser is used for aiming only.

Display		6	5	4	3
1.	°F / °C Symbol -					2
		7
	Fahrenheit / Celsius	8			HI
2.	Hi alarm and low		HOLD LOCK
					LOW
	alarm symbol	9			C	1
3.	Low battery symbol				F
4.	Measuring	10				11
	temperature symbol

5.Lock mode for continuous reading

6.Backlight “on” symbol

7.Laser “on” symbol

8.Holds and displays last temperature measured

9.Current temperature value

10.Function mode icons for MAX, MIN, DIF, (), AVG, HAL, LAL, PRB, E,E

11. Temperature values for MAX, MIN, DIF, ( ), AVG, HAL, LAL, PRB and emissivity values for E

Optical Resolution

Ratio of the distance from the measured object vs. the spot size of the measurement area.

Spot

D =	12	1” @ 12”
		3” @ 36”
S	1	5” @ 60”
		Distance

Emissivity

Emissivity is the ratio of infrared energy emitted from an object versus the infrared energy emitted by a black body. The emissivity of the perfect black body is 1. All other materials have an emissivity ratio between 0.1 (highly reflective) to 1.0 (Ideal black). Emissivity is determined primarily by the material from which an object is con- structed and its surface finish.

The thermometer allows emissivity adjustment for the type of surface being measured. Refer to the following emissivity table.

Emissivity Table

1.00	= Reference source	0.77	= Cotton cloth
0.98	= Carbon filed surface	0.76	= Sand
0.98	= Frost crystals	0.75	= Unglazed silica
0.98	= Skin human	0.74	= Oxidized iron
			at 100°C
0.97	= Slate
		0.73	= Coating No. C20A
0.96	= Water distilled
		0.72	= Basalt
0.96	= Ice smooth
		0.71	= Graphitized carbon
0.95	= Soil saturated with
			at 500°C
	water
		0.70	= Red Rust
0.95	= Carbon candle soot
		0.69	= Iron sheet heavily
0.94	= Glass polished plate
			rusted
0.94	= Paint, oil
		0.67	= Water
0.93	= Brick red
		0.66	= Black Loam
0.93	= Paper white bond
		0.65	= White cement
0.92	= Concrete
		0.64	= Iron cast oxidized
0.92	= Soil dry
		0.63	= Lead oxidized
0.91	= Plaster rough coat
			at 1100°F
0.90	= Wood planed oak
		0.62	= Zirconia on inconel
0.90	= Glazed earthenware
		0.61	= Cu-Zn, brass
0.89	= Snow, granular
			oxidized
0.88	= Glazed Silica	0.58	= Inconel sheet
0.87	= Cuprous Oxide		at 760°C
	at 38°C	0.56	= Smooth white marble
0.86	= Emery Corundum
		0.55	= Al anodized chromic
0.85	= Snow		acid
		0.21	= Iron cast polished
0.85	= Stainless oxidized
	at 800°C	0.20	= Brass rubbed 80
			grit emery
0.84	= Oxidized Iron
		0.16	= Stainless steel
	at 500°C
			18-8 buffed
0.83	= Cuprous Oxide
		0.09	= Aluminium as
	at 260°C
			received
0.82	= Snow, fine particles
		0.07	= Steel polished
0.81	= Brass, unoxidized
		0.05	= Aluminium polished
0.80	= Glass, convex D
			sheet
0.79	= Steel oxidized
		0.05	= Copper polished
0.78	= Copper heavily
		0.03	= Brass highly polished
	oxidized

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