Bacharach 0012-9015 User manual

SLING PSYCHROMETER
Configuration Operation Maintenance
Part Number: 0012-9015
November 2017, Rev. 7
For Use with Spirit Thermometers
P/N 0012-7012 (30° to 110° F, Red Spirit)
P/N 0012-7043 (–5° to 50° C, Blue 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. 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
2 0012-9015 Rev 7
Overview
1. Remove cap (B)
then immerse
end of body to
saturate wick
(A).
A. Wick
B. End cap
C. Psychrometer body
D. Wet bulb thermometer
E. Tube
F. Dry bulb thermometer
G. Screws
H. Thermometer clips
I. Roll pin
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.
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.

Sling Psychrometer
0012-9015 Rev 7 3
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.

Sling Psychrometer
4 0012-9015 Rev 7
Parts and Accessories
Part
Number
Description
Qty per Assembly 0012-xxxx
7011
7012
7013
7043
0012-0180
Plug and Swivel Assembly
1
1
1
1
0012-0176
Thermometer Clip
2
2
2
2
0012-0007
Wick
1
1
1
1
0002-1740
Screw
2
2
2
2
0002-6858
Roll Pin
1
1
1
1
0006-5456
Cap
1
1
1
1
0012-0012
Friction Ring
2
2
2
2
0012-0194
Body (°F)
1
1
-
-
0012-0018
Body (°C)
-
-
1
1
0012-0006
Tube (°F)
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, Blue Spirit
-
-
2
2
Part
Number
Description
Qty
0012-0011
Wick Replacement Kit containing
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
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