SLING PSYCHROMETER
Configuration • Operation • Maintenance
Part Number: 0012-9015
February 2013, Rev. 6
For Use with Red Spirit Thermometers
P/N 0012-7012 (30° to 110° F, Red Spirit)
P/N 0012-7043 (–5° to 50° C, Red Spirit)
Discontinued Mercury Thermometers
P/N 0012-7011 (30° to 110° F, Mercury)
P/N 0012-7013 (–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. war-rants to Buyer that at the time of deliv-ery this Product will be free from defects in
material and manufac-ture and will conform substantially to Bacharach Inc.’s applica-ble specifications.
Bacharach’s liability and Buyer’s remedy under this warranty are limited to the repair or replace-ment, at
Bacharach’s option, of this Product or parts thereof returned to Seller at the factory of manu-facture and
shown to Bacharach Inc.’s reason-able 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
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Sling Psychrometer
1. Remove cap (B)
I. Roll pin
3. Be sure wick
Overview
then immerse
end of body to
saturate wick
(A).
2. Fill
psychrometer
reservoir with
water. Replace
cap (B).
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. Wick
B. End cap
C. Psychrometer body
D. Wet bulb thermometer
E. Tube
F. Dry bulb thermometer
G. Screws
H. Thermometer clips
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.
2 0012-9015 Rev 6
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Operation
Sling Psychrometer
1. To ensure WICK (A) is saturated with water and covers red 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 6 3
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Sling Psychrometer
Qty per Assembly 0012-xxxx
0012-0176
Thermometer Clip
2 2 2
2
0006-5456
Cap 1 1 1 1
0012-0006
Tube (°F)
1 1 -
-
Parts and Accessories
Part Number Description
0012-0180 Plug and Swivel Assembly 1 1 1 1
0012-0007 Wick 1 1 1 1
0002-1740 Screw 2 2 2 2
0002-6858 Roll Pin 1 1 1 1
0012-0012 Friction Ring 2 2 2 2
0012-0194 Body (°F) 1 1 - 0012-0018 Body (°C) - - 1 1
0012-0019 Tube (°C) - - 1 1
0012-0266 Thermometer, 30 to 110°F, Red Spirit 2 2 - 0012-0327 Thermometer, –5 to 50°C, Red Spirit - - 2 2
Part Number Description Qty
0012-0011 Wick Replacement Kit containing 4 Wicks
7011 7012 7013 7043
4 0012-9015 Rev 6
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