Fieldpiece SRH3 User Manual
80
Fieldpiece
80
80
80
80
In-Duct
Problem-Solving
Psychrometer
OPERATOR'S
MANUAL
Model SRH3
PRESS FOR
AUTO-OFF
1 SECOND
ON/OFF
RH/DP/WB
PRESS 1 SEC
BATTERY
TO CLEAR
CHECK
UNITS
MAX/MIN/H
ENTER
OUTPUT
TSH/TEET/NORM
In-Duct
Diagnostic
Psychrometer
SRH3
Quick Start
1. Power on your SRH3 by holding the
ON/OFF button for 1 second.
2. Use the TSH/TEET/NORM button to
select NORMAL mode.
3. Press the RH/DP/WB button to cycle
between relative humidity, dew
point, and wet bulb temperatures.
4. The air temperature will always be
shown in the lower display and the
relative humidity, dew point, or wet
bulb measurement will be displayed
in the upper display in real-time.
5. Insert sensor probe into duct for
80
in-duct measurements.
Certifications
C-Tick (N22675)
CE
WEEE
RoHS Compliant
Description
With your purchase of the SRH3 you
now have the ability to take supply/
return temperature, %RH, wet bulb
and dew point measurements from
inside the duct or plenum.
Your SRH3 is a portable, hand held,
diagnostic psychrometer, designed
for the HVAC/R technician.
SRH3 helps you properly charge
a xed restrictor system by quickly
determining the Target Superheat
(TSH). Your SRH3 can also help
determine optimum airflow across
the evaporator by easily performing
a Target Evaporator Exit Temperature
(TEET) test.
The 38"(96cm) telescoping probe
with laser etched ruling and attened
edges allows you to locate proper
measurement points within a duct and
ensures that your probe is properly
aligned.
The dual display with a bright
backlight, rugged rubber boot with
probe clips, make sure the SRH3 is
ready for any job.
01 03 0602 0504
Display
Auto Power O Enabled
Low Battery Indicator
Relative Humidity
Dew Point
Wet Bulb
Dry Bulb
%Relative Humidity
Outdoor
Indoor
Target Superheat
Target Evaporator Exit Tem-
perature
Normal Range
Temperature (Fahrenheit)
Temperature (Celsius)
Hold Display
Maximum Display
Minimum Display
Controls
ON/OFF
Hold 1 second to toggle power on/o.
Toggle Backlight. (Hold while powering
your SRH3 on to disable APO.)
Toggle display to show relative
RH/DP/WB
humidiy, dew point and wet
bulb temperatures
BATTERY
CHECK
Toggle between Fahrenheit and Celcius.
Hold for 2 seconds to display battery
UNITS
percentage.
PRESS 1 SEC
TO CLEAR
Toggles to display Maximum, Minimum,
MAX/MIN/H
or Hold the current reading. Hold for 1
second to exit and clear stored values.
Conrm Selection
ENTER
Outputs calculations for Target
Superheat or Target Evaporator Exit
OUTPUT
Temperature
Toggle to enter Target Superheat,
TSH/TEET/NORM
Target Evaporator Exit Temp, or
Normal modes.
Functions
Backlight
1. Press the backlight button to toggle the backlight
on/o at any time during the SRH3's use.
Note: The back light will automatically shut o after 1
minute to conserve battery life.
Maximum/Minimum/Hold
1. Pressing the MAX/MIN/H button activates the
Max-Min-Hold function, holding the maximum and
minimum measured values until cleared.
2. Once the Max-Min-Hold function has been
enabled, pressing MAX/MIN/H cycles between
displaying maximum (MAX), minimum (MIN) and
freezing the current value.
3. Press and hold the MAX/MIN/H button for 2 seconds
to erases all stored maximum and minimum values
and return to real-time measurements.
Units
1. Press the units button to switch between degrees
Fahrenheit and Celsius.
Battery Check
1. Press and hold the UNIT button for 2 seconds to
display the battery life in percentage.
Output
1. Press the OUTPUT button to perform calculations
of Target Superheat and Target Evaporator Exit
Temperature after necessary measurements have
been entered.
How to Use
Normal Mode
Normal mode allows you quickly
and easily take real-time dry bulb, wet
bulb, dew point, and relative humidity
measurements.
1. Press TSH/TEET/NORM button until NORM is
displayed in lower left corner.
2. For upper display measurements, press the RH/DP/
WB button to toggle relative humidity, dew point,
or wet bulb temperature measurements.
Note: Dry bulb (air temperature) will always show in
the lower display.
Target Superheat Mode
Perform a simple Target Superheat
test to determine what the superheat
should be on a xed restrictor system.
Use the target superheat to compare
to the actual superheat to determine
if a system is properly charged.
1. Press TSH/TEET/NORM button until TSH is displayed
in the lower left of the LCD.
2. Take a wet bulb measurement at the inlet of the
evaporator. Generally right before the lter is a
good location. Drill or punch a 3/8" hole into the
return plenum for a measurment depth of up to
24 inches. See Figure 1 for recommended return
plenum placement of probe. Insert SRH3 probe into
the plenum to take the wet bulb measurement.
Press ENTER to lock in the reading.
3. Take a dry bulb (air temperature) measurement
going into the condensor. Press ENTER to lock in
the reading.
4. Press OUTPUT to calculate the target superheat.
Compare the target superheat to the actual
superheat of the system.
5. Seal any holes before leaving the jobsite.
Target Evaporator Exit
Temperature Mode
Target Evaporator Exit Temperature
(TEET), aka temperature drop or
delta T, is used to determine if the
evaporator is getting the optimum
airflow. A TEET test can be quickly
performed by taking two easy
temperature measurements at the
return side of the evaporator.
1. Press the TSH/TEET/NORM button until TEET is
displayed in the lower left of the LCD.
2. Take a wet bulb measurement inside the return
plenum. Drill or punch a 3/8" hole into the return
plenum. See Figure 1 for recommended return
plenum placement of probe. Insert SRH3 probe into
the plenum to take the wet bulb measurement.
Press ENTER to lock in the reading.
3. Take a dry bulb measurement at the same place the
previous wet bulb measurement was taken. Press
ENTER to lock in the reading.
4. Press OUTPUT to calculate the target evaporator exit
temperature. Compare this calculated target to the
actual evaporator exit temperature.
5. Take a dry bulb measurement inside the supply
plenum to check the actual Evaporator Exit
Temperature. See Figure 1 for recommended supply
plenum placement of probe. Drill or punch a 3/8"
hole into the supply plenum. Press TSH/TEET/NORM
until NORM is displayed.Insert SRH3 probe into
the plenum and read the temperature in the lower
display.
6. Seal any holes before leaving the jobsite.
Note: For both Target Superheat and Target Evaporator
Exit Temperature modes, you can adjust any
temperature measurement after calculations have
been performed by pressing ENTER. This prompts
you to re-take the measurements.
RCONE1 Probe Lock
Use the RCONE1 to lock your sensor
probe in place inside the duct. Using
the RCONE1 and magnet on the SRH3
allows you hands-free in-duct testing.
See Figure 2.
Do not retract the sensor probe by pulling on the cord.
Doing so may sever the cord from the sensors.
WARNING
07 09 1208 1110
Figure 1
Recommended Hole
Placement for Supply
Plenum Measurements
Recommended
Hole Placement for
Return Plenum
Measurement is
directly before the
evaporator coil. Look behind
the panel before drilling and make
sure you do NOT drill a hole through any critical HVAC components.
Specifications
Telescoping Probe Length: Up to 38 inches (97cm)
Probe Tip Diameter: 0.35 inch (9mm)
Storage temperature: -4°F to 140°F (-20°C to 60°C), 0
to 80% RH (with battery removed)
Temperature Coecient: 0.1 x (specied accuracy)/°C
(<18°C or >28°C)
Over range: "OL" or "-OL" is displayed
Power: Single standard 9-volt battery, NEDA 1604, JIS
006P, IEC 6F22
Auto Power o: after 15 minutes of inactivity if APO
is active.
Battery life: 150 hours typical (alkaline)
Low Battery Indication: is displayed when the
battery voltage drops below the operating level.
Dimensions: 7.9 in (H) x 2.6 in (W) x 1.4 in (D),
[200mm (H) x 66mm (W) x 36mm (D)]
Weight: Approx. 400g, including battery
Temperature:
Sensor type: Precision thermistor
Operating environment: -4°F to 140°F (-20°C to 60°C)
Range: -4°F to 140°F (-20°C to 60°C)
Resolution: 0.1°F / 0.1°C
Accuracy: ±(1°F) 32°F to 113°F
±(2°F) -4°F to 32°F, 113°F to 140°F
±(0.5°C) 0°C to 45°C
±(1°C) -20°C to 0°C, 45°C to 60°C
Relative Humidity:
Sensor Type: Capacitance polymer lm
Operating environment: 32°F to 131°F (0°C to 55°C)
Range: 0% to 100%RH
Accuracy: ±(2.5%) 10% to 90%RH
±(5%) <10%RH and >90%RH
Note: Above accuracies stated at 73.4°F (23°C).
Sensor Response Time: 60 seconds typical for 90% of
total range.
Sensor Hystersis: ±1%RH typical (Excursion of 10% to
90% to 10%RH)
Figure 2
PRESS FOR
AUTO-OFF
1 SECOND
ON/OFF
RH/DP/WB
BATTERY
PRESS 1 SEC
CHECK
TO CLEAR
UNITS
MAX/MIN/H
ENTER
Use the RCONE1 for
hands-free in-duct
measuremesnts.
TSH/TEET/NORM
In-Duct
Diagnostic
Psychrometer
SRH3
OUTPUT
A/C Basics
CAT.III
300V
400A
CLAMP
ACH4
AC Current
Clamp
1AAC / 1mVAC
400AAC MAX
!
ET2W
LO BATT
SEND
RECEIVE
ON
AC
DC
Wireless
Transmitter
SYNC
ET2W
LO BATT
SEND
RECEIVE
ON
AC
DC
Wireless
Transmitter
SYNC
ET2W
LO BATT
SEND
RECEIVE
ON
AC
DC
Wireless
Transmitter
SYNC
AUTO OFF
ARH4
Clear
Input
Output
Recall
Enter
Save
Sync
SETUP
Target
Evaporator
Logger
Light
Exit Temp
CFM
Display
Superheat
SubcoolingCombustion
HVAC Guide
CheckMe!
Fieldpiece
HG3
Data
Service
Displa
y
INPUT FORM
SET 01
Set ID:Indoor Temp
Measurement: 72.8
SET 02
SET ID:Comp Amps
Measurement: 23.6
CustomerID: __JONES123
CAT.III
300V
400A
CLAMP
ACH4
AC Current
Clamp
1AAC / 1mVAC
400AAC MAX
!
ET2W
LO BATT
SEND
RECEIVE
ON
AC
DC
Wireless
Transmitter
SYNC
ET2W
LO BATT
SEND
RECEIVE
ON
AC
DC
Wireless
Transmitter
SYNC
ET2W
LO BATT
SEND
RECEIVE
ON
AC
DC
Wireless
Transmitter
SYNC
AUTO OFF
ARH4
MAX 30VDC
24VAC
CONNECT ONLY TO
ACCESSORY HEAD!
PRESS FOR 1 SEC TO EXIT
AUTO-OFF
SEND ONLY
EH4W
DC AC
FUSED
200mA
MAX
FUSED
30V
MAX
WIRELESS
ENABLED
MAX/MIN
SYNCHOLD
CAT.III
MAX
600V
15 SEC FOR
500mV
RANGE
AUTO-OFF
500
600600
50
5000m
500m
500µ
50m
200m
200m
500m
5000m
50m
50
500
500µ
500
750
500
1400
200
2
K
200
20
M
2
K
200
K
20
RECV
Displa
y
T1 T2
Atmospheric
Pressure
Superheat
Subcooling
T1 T2 Direct Saturation
Target
Superheat
CALCAL
CAL CAL
Test
Pressure
AUTO
OFF
Refrigerant
ON/OFF
Enter
Units
Alarm
Digital Manifold + Vacuum Gauge
SMAN3
ODDB
HH:MM:SS
Psig
Kpa
inHg
cmHg
Psig
Kpa
inHg
cmHg
SHT1
VSAT
APO
Microns
HiLo
SetStable
Alarm
IDWB
Target SH
R-
°F°C
SCT2
LSAT
°F°C
°F°C
The Evaporator, Condenser,
Restrictor (Throttling valve) and
Compressor are the four basic
components of an air conditioner.
Following one pound of refrigerant
through the system shows the
function of each component.
Subcooled liquid refrigerant at high
pressure enters the restrictor and is
throttled to saturated refrigerant at a
lower pressure. The restrictor can be
of either a xed or TXV/EXV type. The
xed type must be charged to a target
superheat that varies with indoor and
outdoor conditions. TXV/EXV systems
must be charged to subcooling.
The evaporator capacity varies
with the indoor heat load on a xed
restrictor. The TXV/EXV regulates the
size of the restriction to maintain a
constant superheat. This essentially
adjusts the capacity of the evaporator
into a gas by absorbing heat from the
indoor air. The refrigerant stays at the
same temperature and pressure until
all the refrigerant evaporates into a
gas. After the refrigerant becomes a
gas, it will continue to absorb heat
and become superheated at which
point its temperature will change. The
Superheat measurement is the best
indication of refrigerant charge level
in a fixed restrictor system. A TXV/
EXV system will keep the superheat
constant. There must be superheat
present to ensure liquid does not
ood the compressor.
Superheat measurements are taken
on the suction line between the
evaporator and compressor.
The compressor takes this low
temperature, low pressure, slightly
superheated refrigerant and
compresses it to a much higher
temperature and pressure.
all of the gas is condensed into a
liquid, additional removal of heat
causes a temperature drop that
is known as subcooling. TXV/EXV
systems are charged to subcooling
since superheat is controlled by
the throttle valve. Subcooling
measurements are taken on the
liquid line between the condenser
and TXV/EXV. Finally, the subcooled
liquid enters the restrictor and the
cycle starts again.
EVAPORATOR
RETURN AIR SUPPLY AIR
w
o
L
P
r
e
s
s
u
r
e
REFRIGERANT
FLOW
e
s
s
u
r
e
S
S
i
d
e
e
d
i
COMPRESSOR
THROTTLE
VALVE
H
i
g
h
P
r
responding to the indoor heat load.
condenses back into a liquid. Once
After the restrictor, refrigerant enters
the evaporator at a low temperature
and pressure and boils (evaporates)
13 15 1814 1716
The highly superheated gas enters
the condenser and rejects heat
into the outside air. The refrigerant
OUTDOOR AIR HOT AIR
CONDENSER
Maintenance
Clean the exterior with a dry cloth.
Do not use liquid.
Sensor Care
When not in use it is best to protect
this sensors with the vinyl slip cover
included with the SRH3.
Extreme conditions or exposure to
solvent vapors may oset the RH%
sensor. If this happens, place the
sensor in a controlled envrionment of
75%RH and between 68°F - 86°F for a
period of 24 hours.
To create a 75%RH environment
moisten a small amout of table salt,
in an open container such as a clean
2 liter bottle cap.
Place the container with the salt
solution and the SRH3 probe in a
sealable plastic bag, and leave the bag
in a room temperature location where
it will not be disturbed for 24 hours.
Note: It is important that the salt
solution does not come in direct
contact with the sensor, as this may
permenantly damage the sensor.
Battery ReplacementWhen
the meter displays the battery
should be replaced. Turn your SRH3
o and replace with 9V battery.
Auto Power O
Your SRH3 powers o automatically
after approximately 15 minutes to
lengthen battery life. To disable
"Auto O," hold the button while
powering on your SRH3. When
disabled, APO will not display in upper
left of LCD.
Limited Warranty
This meter is warranted against
defects in material or workmanship
for one year from date of purchase.
Fieldpiece will replace or repair the
defective unit, at its option, subject
to verication of the defect.
This warranty does not apply
to defects resulting from abuse,
neglect, accident, unauthorized
repair, alteration, or unreasonable use
of the instrument.
Any implied warranties arising
from the sale of a Fieldpiece product,
including but not limited to implied
warranties of merchantability and
tness for a particular purpose, are
limited to the above. Fieldpiece shall
not be liable for loss of use of the
instrument or other incidental or
consequential damages, expenses, or
economic loss, or for any claim of such
damage, expenses, or economic loss.
State laws vary. The above
limitations or exclusions may not
apply to you.
For Service
Wireless Solutions
In the USA, call Fieldpiece
Instruments for one-price-x-all out of
warranty service pricing. Send check or
money order for the amount quoted.
Send the meter freight prepaid to
Fieldpiece Instruments. Send proof
of date and location of purchase for
in-warranty service. The meter will be
from Fieldpiece
ET2W
with ACH4
ET2W
with ARH4
ET2W
with ACM3
ET2W w/ ARH4
transmitting wirelessly
to EH4W
repaired or replaced, at the option of
Fieldpiece, and returned via least cost
transportation. Outside of the USA,
please visit www.eldpiece.com for
service contact information.
19 21 2420 2322
www.fieldpiece.com
© Fieldpiece Instruments, Inc 2011; v05
HG3 Multi-Channel
Wireless Receiver
data logging
multiple readings at
the same time
INPUT FORM
SET 01
Set ID:Indoor Temp
Measurement: 72.8
SET 02
SET ID:Comp Amps
Measurement: 23.6
CustomerID: __JONES123
Sync
Recall
Output
Enter
SETUP
CheckMe!
Display
Superheat
SubcoolingCombustion
Save
Input
CFM
Target
Evaporator
Exit Temp
Data
Logger
Service
Light
Clear
HVAC Guide
Fieldpiece HG3
HG3 w/ Multi-
Channel
Wireless
SMAN3 Digital
Manifold w/
Micron Gauge
SMAN3 is the most advanced digital
manifold w/ micron gauge on the
market. Check it out.
LT17AW w/ Built-in Wireless
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