Page 1
STRATUS
INSTALLATION
PROPER INSTALLATION IS IMPORTANT. IF YOU NEED ASSISTANCE, CONSULT A CONTRACTOR, ELECTRICIAN
OR TELEVISION ANTENNA INSTALLER (CHECK WITH YOUR LOCAL BUILDING SUPPLY, OR HARDWARE STORE
FOR REFERRALS). TO PROMOTE CONFIDENCE, PERFORM A TRIAL WIRING BEFORE INST TION.ALLA
1
Remove the cover of the Humidity sensor to gain
access to the holes on the upper left and lower
right side of the sensor. Mount the sensor to the
wall with two wood screws. The sintered bronze
sensor house should face toward the ground.
Select a location that is protected from direct
sunlight. (A northern exposure about six feet
off the ground with good air flow will give the
best results.)
SENSOR
CAULK
WOOD SCREWS
COVER
AC
ADAPTER
INDICATOR
BRASS
NUTS
TEST POINT 1
1
2
Test
Point:
3
8"
MIN
2
BRONZE
SENSOR
HOUSE
Form a drip loop with the wire that
CABLE
CLIP
is at least eight inches below the
exit point of entry. Anchor any
exposed wire with insulated cable
clips. Run the wire through the
building to the location where the
DRIP
LOOP
indicator will be located. Caulk any
holes when done
3
Feed the AC adaptor’s cord to the rear of the indicator.
Connect the two wires of the AC adapter cord to the
indicator using the brass nuts supplied in the hardware
pack. The polarity does not matter.
30 Barnet Boulevard
New Bedford, MA 02745
(508) 995-2200
Page 2
STRATUS
INSTALLATION (CONT.)
4
Connect the three wires from the Humidity sensor. Connect
the wire to post #1, the wire to post #2, and the
RED
GREEN
GREEN
wire to post #3. Do not plug the adapter in until all of
the connections have been checked.
BLACKRED
INDICATOR
RED WIRE
RED
BLACK WIRE
BLACK
1
TEST POINT1
Test
Point:
2
3
GREEN WIRE
GREEN
WALL
CABLE-HOLE
CABLES
WOOD
PANEL
FEED-THRU-HOLE
SCREW
5
SCREW
Mount the brass instrument directly over the cable hole
used to route the power and sensor wires to avoid crimping
the wire under the lip of the case. We recommend mounting
the brass instrument on one of our pre-drilled and centered
wood panels. Plug the AC adapter into a 110 VAC power
outlet.
30 Barnet Boulevard
New Bedford, MA 02745
(508) 995-2200
Page 3
STRATUS
OPERATION
It can take 12-24 hours for the humidity sensor to
acclimate to its surroundings and reflect accurate
readings. Before reading your Hygrometer, you
should tap the case with your finger. A tap change
of 1-2% is a common occurrence with any slow
moving precision meter movement.
The trend register needle can be set by
turning the center knob on the indicator
dial.
30 Barnet Boulevard
New Bedford, MA 02745
(508) 995-2200
Page 4
STRATUS
INFORMATION ON HUMIDITY
DEW POINT
Dew point is the temperature at which a parcel of air reaches its saturation point and can no longer
hold water in the vapor state. When the dew point falls below freezing it is called the frost point.
This is the point at which water vapor no longer
creates dew, but instead creates frost.
Dew point formula:
This formula will give you a good approximation
of Dew Point.
Dew point =Air temp -
(100 - R.H.)
5
Dew points above 70 F are very uncomfortable.
Dew points between 60 F and 70 F are sticky.
Dew points between 50 F and 60 F are
comfortable.
Dew points below 50 F feel dry.
90%
85%
80%
75%
70%
65%
60%
55%
50%
RELATIVE HUMIDITY
45%
40%
35%
30%
20
18
17
16
15
13
12
11
-2
-6
30
28
26
25
24
22
20
19
9
17
6
15
4
13
1
11
Dew Point Chart:
AIR TEMPERATURE ( F)
40
50
37
47
36
45
34
44
33
42
31
40
30
38
29
36
25
34
23
31
21
29
18
26
16
13
23
20
8
4
60
70
80
DEW POINT ( F)
57
67
77
55
65
75
54
63
73
52
62
71
50
60
68
47
57
66
45
55
64
43
53
61
40
50
59
37
47
56
35
43
52
31
40
48
28
36
44
90
87
84
82
80
78
76
73
70
67
64
61
57
52
100
97
95
93
91
88
85
83
80
77
73
69
65
61
110
107
104
102
100
96
93
92
89
86
82
78
74
69
120
117
113
110
108
105
103
101
98
94
91
87
83
77
HEAT INDEX
The Heat Index combines air temperature and relative humidity for an apparent temperature feeling
on the human body.
If the heat index is 80 F-90 F fatigue is possible
with prolonged exposure and activity.
If the heat index is 89 F-105 F sunstroke, heat
cramps, and heat exhaustion are possible.
If the heat index is 105 F-130 F sunstroke, heat
cramps, and heat exhaustion are likely.
If the heat index is over 130 F heat stroke, and
sunstroke are very likely with continued activity.
40%
45%
50%
55%
60%
65%
70%
75%
80%
RELATIVE HUMIDITY
85%
90%
95%
100%
80
82
HEAT INDEX-TEMPERATURE FEELS LIKE ( F)
80
81
80
82
81
83
81
84
82
84
82
85
83
86
84
88
84
89
85
90
86
91
86
93
87
95
Heat Index Chart:
AIR TEMPERATURE ( F)
88
88
89
91
93
95
98
100
103
106
110
113
117
121
90
91
93
95
97
100
103
105
109
113
117
122
127
132
84
83
84
85
86
88
89
90
92
94
96
98
100
103
86
85
87
88
89
91
93
95
97
100
102
105
108
112
92
94
96
99
101
105
108
112
116
121
126
131
94
97
100
103
106
110
114
119
124
129
135
96
101
104
108
112
116
121
126
132
98
105
109
113
117
123
128
134
100
109
114
118
124
129
136
102
114
119
124
130
137
30 Barnet Boulevard
New Bedford, MA 02745
(508) 995-2200
Page 5
1
Unplug the
AC Adapter.
STRATUS
TROUBLESHOOTING
2
Remove the
instrument from
the wall.
3
Disconnect the AC adapter from the indicator and connect it
to an AC voltmeter. Plug the AC adapter back in. If working
properly, the AC adapter will deliver 11.5 to 18VAC. If not
working properly please contact Maximum. If the Adapter is
working properly, continue to step 4.
Unplug the AC adapter and reconnect it to the indicator.
4
Plug the adapter back into a 110V outlet.
TEST POINT 1
Test
Point:
1
2
3
30 Barnet Boulevard
New Bedford, MA 02745
(508) 995-2200
Page 6
JUMPER
WIRE
TEST POINT 1
1
2
Test
Point:
STRATUS
TROUBLESHOOTING (CONT.)
INDICATOR
5
Use a jumper wire to connect across the test point
terminal and terminal #1. The calibration test point
has been hand-written on the back of the indicator.
3
6
If the indicator is in proper working order it will read within 2%
of the calibration test point. We recommend that you re-mount
the instrument in this mode for several hours and observe it
periodically. This will help identify intermittent problems. If the
indicator registers within 2% of the test point then the problem
is in the sensor or wire.
TEST POINT 1
7
Test
Point:
1
2
3
To test the sensor connect a DC voltmeter to terminals
#2 and #3. Terminal #2 is the ground terminal and #3
the positive of the meter. Use this chart to identify that
the voltage output of the sensor is correct.
%RH
Voltage
10
.9V
20
1.1V301.4V
40
1.6V501.9V
60
2.1V702.4V
80
2.6V902.9V
100
3.12V
30 Barnet Boulevard
New Bedford, MA 02745
(508) 995-2200
Page 7
IMPORTANT ADDITIONAL INFORMATION
Components: Along with the indicator, the following components are included with this instrument:
AC Adaptor: This instrument requires its own AC Adaptor. Due to the various power
requirements of each Maximum instrument, attempting to run more than one instrument on a single
adaptor could cause improper operation and/or damage to the instrument(s) thereby voiding your
5-year warranty.
Brass Case: Your brass case is solid brass A70-30 Holloware quality, with a durable lacquer
finish. It is in fact a piece of jewelry and should be treated as such. It should be cleaned at least
once a week to keep airborne pollutants (dust, etc…) and any moisture from collecting on the case
thereby attacking the lacquer. At no time should you use an abrasive cleaner or cloth on the brass
case. Simply use a soft cloth or soft paper towel with a mild glass cleaner to wipe the case clean.
If your instruments are in a summer home, and you are not able to clean them regularly, simply lay
a small cloth or towel across the top two-thirds so that dust cannot settle on the finish.
Specifications: All instrumentation or measuring devices have accuracy tolerances and
specifications. Making comparisons between different pieces of equipment is appropriate provided
the specified accuracies of both are known.
Measurement Range Guaranteed Accuracy
Relative Humidity (Indicator) 0 to 100% ± 2%
Relative Humidity (Sensor) 0 to 100% ± 4%
Page 8
Electrical Damage – Common Causes & Recommended Prevention
Electrical damage can be caused by many different factors. Below are some of the more common causes and
some suggested methods of minimizing potential problems.
Common Causes:
Storm Activity – lightening in your area can do damage to your instruments in different ways. The obvious
way is due to a direct or nearby strike. In addition, lightening storms, dust storms, dry snowstorms and
strong dry winds can all cause static electricity to build up on and around your external sensors. Rega rdless
of the cause, this built up electricity can discharge itself through the cable connecting the external sensors to
the instrument.
Power Surges – A surge may come from the electric company’s switching generators or power grids, from
local industries or after power interruption when accumulated power suddenly surges back through AC lines.
Even the on-and-off switching of large electrical appliances, such as refrigerators or clothes dryers can
create damaging fluctuations. This is especially true with sensitive weather recording devices.
Yourself – Are you constantly giving and/or receiving a shock every time you touch a doorknob or another
person? If so, you have a great deal of static electricity in your environment. Depending on where you live,
static electricity may be a year round problem or only a seasonal problem. In either case, it is possible for a
person to carry enough of a charge to damage an instrument.
Recommended Prevention:
Use Surge Protectors – For the AC adapter, a UL 1449 rated surge protector with EMI/RFI filtering is
recommended. This rating will be clearly listed on the packaging of all good qualit y surge protector.
Discharge Yourself – If the instruments are located in an environment where static electricity is a proble m ,
make sure that you discharge yourself before touching the instrument(s). The shock that you get from
touching a doorknob or another person can often be sufficient to damage an instrument.
30 SAMUEL BARNET BOULEVARD NEW BEDFORD, MASSACHUSETTS 02745 U.S.A.
TEL. 508.995.2200 WWW.MAXIMUM-INC.COM FAX 800.989.2580
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