Bacharach Sling Psychrometer User manual

SLING PSYCHROMETER
Configuration  Operation  Maintenance
Part Number: 0012-9015
November 2017, Rev. 7
For Use with Spirit Thermometers
P/N 0012-7012
P/N 0012-7043
(30° to 110° F, Red Spirit)
(–5° to 50° C, Blue Spirit)
Discontinued Mercury Thermometers
P/N 0012-7011
P/N 0012-7013
(30° to 110° F, Mercury)
(–5° to 50° C, Mercury)
CAUTION: Damage to thermometers or
plastic case will result if instrument is
exposed to direct sunlight or excessive
heat for prolonged periods.
WARRANTY
Bacharach, Inc. warrants to Buyer that at the time of delivery this Product will be free from defects in material
and manufacture and will conform substantially to Bacharach Inc.’s applicable specifications. Bacharach’s
liability and Buyer’s remedy under this warranty are limited to the repair or replacement, at Bacharach’s option,
of this Product or parts thereof returned to Seller at the factory of manufacture and shown to Bacharach Inc.’s
reasonable satisfaction to have been defective; provided that written notice of the defect shall have been given
by Buyer to Bacharach Inc. within one (1) year after the date of delivery of this Product by Bacharach, Inc. For
full details concerning this warranty, contact Bacharach Inc.
Product Leadership  Training  Service  Reliability
Sling Psychrometer
Overview
1. Remove cap (B)
then immerse
end of body to
saturate wick
(A).
2. Fill
psychrometer
reservoir with
water. Replace
cap (B).
3. Be sure wick
covers “wet”
bulb. The
other bulb is
dry.
4. Pull body (C)
from tube (E)
until body
hangs free.
5. Use tube
(E) as
handle;
whirl body
(C) about
1-½
minutes.
A.
B.
C.
D.
E.
F.
G.
H.
I.
Wick
End cap
Psychrometer body
Wet bulb thermometer
Tube
Dry bulb thermometer
Screws
Thermometer clips
Roll pin
6. Read wet and dry bulb thermometers;
replace body in tube.
7. Set thermometer readings on upper
two calculator scales.
8. Read % relative humidity as indicated
by arrow.
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0012-9015 Rev 7
Sling Psychrometer
Operation
1. To ensure WICK (A) is saturated with water and covers spirit reservoir on WET BULB
THERMOMETER (D), remove END CAP (B) and immerse PSYCHROMETER BODY (C) up
to the thermometer reservoirs until WICK is thoroughly wetted.
2. Fill END CAP with water and replace; tighten just enough to prevent leakage. Be sure
reservoir on other THERMOMETER (F) is dry.
3. Pull TUBE (E) clear of BODY so BODY can swivel.
4. Holding TUBE, whirl body two to three revolutions per second (120 to 180 RPM).
5. Continue whirling until temperatures stabilize (1-½ minutes is usually ample).
6. Immediately read WET BULB THERMOMETER (D) and then DRY BULB THERMOMETER
(F). (See application instructions.)
7. Set wet and dry bulb temperatures opposite each other on side rule type calculator
scales, sliding BODY into TUBE as required.
8. Read % R.H. (percent relative humidity) indicated by arrowhead on lower scale.
Application
Wet-bulb temperatures should be read first and as quickly as possible for highest
accuracy. Delay in reading may cause error. In addition, the wick must be kept clean,
saturated with water, and whirled long enough to stabilize temperatures.
The range of the psychrometer is from 10% to 100% R.H., for dry-bulb temperatures of
30° to 100°F (–5° to 50°C).
In addition to the above instructions, barometric pressure and other factors will influence
exact relative humidity determinations to a very minor degree. For precise work, use a
psychrometric chart or set of tables such as W.B. No. 235 “Psychrometric Tables for
Obtaining the Vapor Pressure, Relative Humidity, and Temperature of Dew Point,” which
can be purchased from the Superintendent of Documents, United States Government
Printing Office, Washington, D.C. The accuracy of the Psychrometer, however, is
satisfactory for all except the most exacting work.
Maintenance
WICK (A) should be kept clean. When dirty, cut off WICK below WET BULB THERMOMETER
(D) and pull clean section out of END CAP (B) and slide over bulb on WET BULB
THERMOMETER.
A WICK REPLACEMENT KIT may be purchased separately (refer to parts list). One or two
extra WICKS may be kept in END CAP and will help retain moisture longer. Pack WICKS
loosely to allow thorough water saturation and ample water supply to the WET BULB
THERMOMETER.
THERMOMETERS (D) and (F) are replaceable by backing off SCREWS (G) and loosening
THERMOMETER CLIPS (H). To separate BODY (C) and TUBE (E), drive ROLL PIN (I) out of
eye in PLUG AND SWIVEL ASSEMBLY, which then may be slid out back end of TUBE.
0012-9015 Rev 7
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Sling Psychrometer
Parts and Accessories
Part
Number
0012-0180
0012-0176
0012-0007
0002-1740
0002-6858
0006-5456
0012-0012
0012-0194
0012-0018
0012-0006
0012-0019
0012-0266
0012-0327
Part
Number
0012-0011
Description
Plug and Swivel Assembly
Thermometer Clip
Wick
Screw
Roll Pin
Cap
Friction Ring
Body (°F)
Body (°C)
Tube (°F)
Tube (°C)
Thermometer, 30 to 110°F, Red Spirit
Thermometer, –5 to 50°C, Blue Spirit
Description
Wick Replacement Kit containing
Qty per Assembly 0012-xxxx
7011
7012
7013
7043
1
1
1
1
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2
2
2
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1
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2
1
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2
Qty
4 Wicks
Bacharach, Inc.
621 Hunt Valley Circle
New Kensington, PA 15068 USA
Pittsburgh, PA USA | Dublin, IRE | Gloucester, UK | Stanardsville, VA USA | Toronto, CAN
mybacharach.com | [email protected]
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0012-9015 Rev 7