IDEAL INDUSTRIES 61-685 User Manual

Page 2

HOLD

LOCK

LOW

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
1. °F / °C Symbol -
Fahrenheit / Celsius
2. Hi alarm and low
alarm symbol
3. Low battery symbol
4. Measuring
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.

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.

1” @ 12”

3” @ 36”

5” @ 60”

Distance

Spot

D 12

S 1

1.00 = Reference source
0.98 = Carbon filed surface
0.98 = Frost crystals
0.98 = Skin human
0.97 = Slate
0.96 = Water distilled
0.96 = Ice smooth
0.95 = Soil saturated with

water

0.95 = Carbon candle soot
0.94 = Glass polished plate
0.94 = Paint, oil
0.93 = Brick red
0.93 = Paper white bond
0.92 = Concrete
0.92 = Soil dry
0.91 = Plaster rough coat
0.90 = Wood planed oak
0.90 = Glazed earthenware
0.89 = Snow, granular
0.88 = Glazed Silica
0.87 = Cuprous Oxide

at 38°C

0.86 = Emery Corundum
0.85 = Snow
0.85 = Stainless oxidized

at 800°C

0.84 = Oxidized Iron

at 500°C

0.83 = Cuprous Oxide

at 260°C

0.82 = Snow, fine particles
0.81 = Brass, unoxidized
0.80 = Glass, convex D
0.79 = Steel oxidized
0.78 = Copper heavily

oxidized

Emissivity Table

0.77 = Cotton cloth
0.76 = Sand
0.75 = Unglazed silica
0.74 = Oxidized iron

at 100°C

0.73 = Coating No. C20A
0.72 = Basalt
0.71 = Graphitized carbon

at 500°C

0.70 = Red Rust
0.69 = Iron sheet heavily

rusted

0.67 = Water
0.66 = Black Loam
0.65 = White cement
0.64 = Iron cast oxidized
0.63 = Lead oxidized

at 1100°F

0.62 = Zirconia on inconel
0.61 = Cu-Zn, brass

oxidized

0.58 = Inconel sheet

at 760°C

0.56 = Smooth white marble
0.55 = Al anodized chromic

acid

0.21 = Iron cast polished
0.20 = Brass rubbed 80

grit emery

0.16 = Stainless steel

18-8 buffed

0.09 = Aluminium as

received

0.07 = Steel polished
0.05 = Aluminium polished

sheet

0.05 = Copper polished
0.03 = Brass highly polished