Minco AH440 User manual

Tel: 763. 571.3121 • Fax: 763. 571.0927 • www.minco.com
AH440 Humidity and Temperature Transmitter
Installation and Operating Instructions

Minco Tel: 763. 571.3121 • Fax: 763. 571.0927 • www.minco.com 2
Description
Model AH440 is humidity / temperature assembly consisting of separate 2-wire temperature compensated
humidity and temperature transmitters, as well as a rugged sensing probe. he assembly utilizes a Honeywell
HIH series monolithic IC humidity sensor, which provides excellent stability and chemical resistivity. he
humidity transmitter converts the humidity sensor’s signal into a 4 to 20 mA DC current, which changes
proportionally from 4 mA at 0% RH to 20 mA at 100% RH. he leads that supply power also carry the current
signal. he additional temperature transmitter provides a second 4 to 20 mA DC output where the current
changes from 4 mA at the lowest temperature of the range, to 20 mA at the top of the temperature range.
he range of the temperature transmitter can be re-scaled via dip-switches. hese transmitters have non-
interacting, field adjustable zero and span pots and are available in duct mount, wall mount, outside air (OSA),
and space mount configurations.
Speci ications
Output(s):
Humidity: 4 to 20 mA DC = 0% to 100% RH.
emperature: 4 to 20 mA DC over specified range.
Sensing Element:
Humidity: Capacitive monolithic IC.
emperature: 1000 ohm platinum; 2 lead R D.
Ambient Temperature:
Operating:
Room: -10 to 150°F (-23 to 65°C), non-condensing.
Duct/Wall/OSA: -10 to 185°F (-23 to 85°C), non-condensing.
Storage:
Room: -58 to 150°F (-50 to 65°C), non-condensing.
Duct/Wall/OSA: -58 to 185°F (-50 to 85°C), non-condensing.
Supply voltage:
9.5 to 35 VDC, non-polarized.
Voltage e ect:
.001% of span/volt from 9.5 to 35 VDC.
Loop resistance:
he maximum allowable resistance of the signal-carrying loop, including
extension wires and load resistors, is given by this formula: R
loopmax
= (V
supply
-
9.5)/0.02 AMPS. For example, if supply voltage is
24 VDC, the loop resistance must be less than 725Ω.
Accuracy:
Includes temperature, linearity, hysteresis, repeatability, and voltage effects.
Humidity:
±1% from 10% to 80% RH @ 25 to 35°C or ±2% from 0% to 90% RH @ 25°C.
(±3% from 0% to 90% RH @ 15 to 50°C).
(±5% from 0% to 90% RH @ 0 to 82°C).
Temperature:
± 0.75% of span for 32 to 122°F ambient
± 1.5% of span for -13 to 185°F ambient
Adjustments:
Zero and Span field adjustments, non-interacting.
Time Constant:
50 seconds in slow moving air.
Connections:
Screw terminals (22-14 AWG wire).
Weight:
1.77 lb (0.81 kg).
Minimum output current:
3.5 mA.
Maximum output current:
23 mA.

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Installation Do’s and Don’ts
Do:
•Check the label and verify the model number of the unit.
•Confirm the required power and signal wires are available at installation site.
•Avoid electrical interference with other signals by using twisted pair wiring. Do not run signal leads
near or parallel to line voltage or other power leads.
•Mount the unit on an interior wall located away from air drafts coming from forced air heating/cooling
vents, within the wall and/or the wiring conduit.
Don’t:
•Do not touch or manipulate the sensors.
•Do not expose the sensor to direct light during installation. his causes a false reading. Should this
occur, shade the sensor. It will self-adjust and yield an accurate reading in less than two minutes.
•Do not expose the sensor or transmitter to static electricity. his device incorporates CMOS
components which are vulnerable to damage via static charges.
Mounting
Installation of the AH440 consists of mounting the transmitter and connecting it to power.
Duct/Wall/OSA Mounting: Models AH440D… AH440O… AH440W
1. For the duct mount model AH440D only, drill ½” hole into sheet metal of duct. (Probe is 3/8” in
diameter.)
2. Remove the rubber cap from the end of the probe.
3. Using the fold-out tabs on bottom of housing, mount housing to sheet metal.
4. Remove transmitter cover and connect power wires to the transmitter by 2 screw terminals located
near the edge of the circuit board (Figure 2). Power supply must not exceed 35 VDC.
5. Re-install cover.

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Humidity Transmitter Wiring Diagram
Figure 1
Temperature Transmitter Wiring Diagram
Figure 2

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Power Supply
DC power supply requirements are determined by the humidity and temperature transmitter’s minimum
voltage requirement and voltage drop across the load resistor and installation lead wires.
Example: he transmitter requires 9.5 Volts minimum. A typical 250 ohm load resistor drops 5.0 Volts @ 20 mA.
Allowing a margin of 0.5 Volts for the supply permits 25 ohms of lead wire resistance for remote installation.
otaling these, we get a minimum power supply requirement of 15.0 VDC.
Using a 24 VDC power supply will take care of nearly all installations, but the AH440 will operate at voltages up
to 35 VDC.
Humidity Transmitter Calibration
Calibration of the humidity transmitter can be done in a number of ways; comparison to another calibrated RH
instrument, using saturated salts, or in a controlled environment using a humidity chamber. he humidity and
temperature transmitters have non-interacting zero and span pots for field calibration.
Comparison method
o compare the calibration of the AH440 to another calibrated RH instrument, both sensors should be within
2” to 3” of each other with a fan blowing on both sensors for at least 10 minutes. his will equalize the
temperature of both sensors and emulsify the moisture content of the air. If adjustment is needed, adjust the
humidity zero (HZ) pot only. Refer to wiring diagrams 1-4 for location of the adjustment pots. Do not adjust
the span control.
Saturated Salts
Calibration is accomplished using saturated salt calibration cells as humidity standards. he cells are designed
for field use in constant temperature conditions. Various types of cells and their respective relative humidity
values are available. he cells must accept a 3/8” diameter probe. If adjustment is needed, and you’re
performing a single point calibration, adjust the humidity zero (HZ) pot only. For 2 point calibrations, use the
humidity zero (HZ) pot to adjust the low humidity calibration point and the humidity span (HS) pot to adjust
the high humidity calibration point.
Humidity Chamber
Follow the instructions of the humidity chamber for simulating humidity and temperature under controlled
conditions. If adjustment is needed, and you’re performing a single point calibration, adjust the humidity zero
(HZ) pot only. For 2 point calibrations, use the humidity zero (HZ) pot to adjust the low humidity calibration
point and the humidity span (HS) pot to adjust the high humidity calibration point. If the humidity span (HS)
pot is adjusted, go back and verify that unit is still within calibration at the low humidity calibration point.
Temperature Transmitter Calibration
emperature Chamber/bath
Follow the instructions of the temperature chamber or bath simulating temperature under controlled
conditions. If adjustment is needed, and you’re performing a single point calibration, adjust the temperature
zero ( Z) pot only. For 2 point calibrations, use the temperature zero ( Z) pot to adjust the low temperature
calibration point and the temperature span ( S) pot to adjust the high emperature calibration point. If the
temperature span ( S) pot is adjusted, go back and verify that unit is still within calibration at the low
temperature calibration point.

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Warranty
Items returned within one year from the date of sale, transportation prepaid, which Minco Products, Inc. (the
“seller”) reasonably determines to be faulty by reason of defective materials or faulty workmanship will be
replaced or repaired at the seller’s discretion, free of charge.
his remedy is to be the sole and exclusive remedy available to the buyer in the event of a breach by the seller.
Items that show evidence of mishandling or misapplication may be returned by the seller at the customer’s
expense.
Furthermore, the seller is not to be held responsible for consequential damages caused by this product except
as required under Minnesota Statutes, Section 336.1-719 (3).
his warranty is in lieu of any other expressed warranty or implied warranty of merchantability or fitness for a
particular purpose, and of any other obligations or liability of the seller or its employees or agent.
How to Order AH440
AH440 Model Number:
AH440 – Dual Board Humidity / emperature ransmitter
D
Enclosure:
D = Duct mount, 8” probe length
O = Outside Air/Wall mount, 4” probe length with shield,
weather resistant enclosure
W
=
Wall mount, 4” probe length, weather resistant enclosure
1
Output: 4 to 20 mA DC
N10
Calibration Accuracy: (Humidity ransmitter)
N10 = ±1% from 10% to 80% (25 to 35°C) with NIS certificate
N20 = ±2% from 0% to 90% (25°C) with NIS certificate
S20 = ±2% from 0% to 90% (25°C)
S
emperature ransmitter range:
EN =
-20°F
to
140°F
S =
0°F
to
100°F
A =
20°F
to
120°F
BI =
30°F
to
130°F
KK =
30°F
to
180°F
N =
32°F
to
122°F
H =
40°F
to
90°F
Consult factory for other possible ranges.
1
Sensing Element Cover (omitted on “S” space mount models)
0 = Sintered stainless steel; pressed on cover
1 = Sintered stainless steel; screw on cover
2 = Slotted stainless steel; screw on cover (not available on “O” outside air models)
AH440D1N10S 1
←
Sample part number

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Dimensions
Duct
OSA
Wall
4.5 REF 4 ±.12
2.3
REF
7/8 HEX
Ø1.250
GASKET
4.5 REF
WEATHERPROOF
CONNECTION BOX
MO EL CH317
2.3
REF
4 ±.12
GASKET
Ø0.375
2.175 REF
4.5 REF
Ø0.375
1.0 REF
8 ±.125 2.75 REF
LINE
POWER
SENSING
AREA
GASKET
CRIMP FITTING

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el: 1.763.571.3121
Fax: 1.763.571.0927
www.minco.com
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© Minco 2009
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