Fieldpiece SRH3 Operator's Manual

Fieldpiece

Quick Start

1. Power on your SRH3 by holding the
ON/OFF button for 1 second.
In-Duct
2. Use the TSH/TEET/NORM button to
select NORMAL mode.
Problem-Solving
3. Press the RH/DP/WB button to cycle
Psychrometer
between relative humidity, dew
point, and wet bulb temperatures.
4. The air temperature will always be
OPERATOR'S
shown in the lower display and the
MANUAL
relative humidity, dew point, or wet
bulb measurement will be displayed
Model SRH3 in the upper display in real-time.
5. Insert sensor probe into duct for
in-duct measurements.
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Certifications

PRESS FOR
AUTO-OFF 1 SECOND
ON/OFF
RH/DP/WB
BATTERY PRESS 1 SEC
CHECK TO CLEAR
UNITS
MAX/MIN/H
ENTER OUTPUT
TSH/TEET/NORM
In-Duct
Diagnostic
Psychrometer
SRH3
01 02
plenum placement of probe. Insert SRH3 probe into

How to Use

the plenum to take the wet bulb measurement.
Press ENTER to lock in the reading.

Normal Mode

3. Take a dry bulb (air temperature) measurement
going into the condensor. Press ENTER to lock in
Normal mode allows you quickly
the reading.
and easily take real-time dry bulb, wet
4. Press OUTPUT to calculate the target superheat.
bulb, dew point, and relative humidity Compare the target superheat to the actual
superheat of the system.
measurements.
5. Seal any holes before leaving the jobsite.
1. Press TSH/TEET/NORM button until NORM is
displayed in lower left corner.
Target Evaporator Exit
2. For upper display measurements, press the RH/DP/
WB button to toggle relative humidity, dew point,
Temperature Mode
or wet bulb temperature measurements.
Note: Dry bulb (air temperature) will always show in
the lower display.
Target Evaporator Exit Temperature
( TEET ), aka temperature drop or

Target Superheat Mode

delta T, is used to determine if the
Perform a simple Target Superheat evaporator is getting the optimum
test to determine what the superheat airflow. A TEET test can be quickly
should be on a fixed restrictor system. per formed by taking two easy
Use the target superheat to compare temperature measurements at the
to the actual superheat to determine return side of the evaporator.
1. Press the TSH/TEET/NORM button until TEET is
if a system is properly charged.
displayed in the lower left of the LCD.
1. Press TSH/TEET/NORM button until TSH is displayed
2. Take a wet bulb measurement inside the return
in the lower left of the LCD.
plenum. Drill or punch a 3/8" hole into the return
2. Take a wet bulb measurement at the inlet of the
plenum. See Figure 1 for recommended return
evaporator. Generally right before the filter is a
plenum placement of probe. Insert SRH3 probe into
good location. Drill or punch a 3/8" hole into the
the plenum to take the wet bulb measurement.
return plenum for a measurment depth of up to
Press ENTER to lock in the reading.
24 inches. See Figure 1 for recommended return
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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 fixed 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
C-Tick (N22675) with laser etched ruling and flattened
edges allows you to locate proper
CE measurement points within a duct and
ensures that your probe is properly
WEEE aligned.
The dual display with a bright
RoHS Compliant backlight, rugged rubber boot with
probe clips, make sure the SRH3 is
ready for any job.
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3. Take a dry bulb measurement at the same place the
previous wet bulb measurement was taken. Press
ENTER to lock in the reading.
AUTO-OFF
4. Press OUTPUT to calculate the target evaporator exit
AUTO-OFF
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.
AVERAGE
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.
WARNING
Do not retract the sensor probe by pulling on the cord.
Doing so may sever the cord from the sensors.
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Display
Auto Power Off 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)
AUTO-OFF Temperature (Celsius)
Hold Display
Maximum Display
Minimum Display
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AUTO-OFF
AUTO-OFF
AUTO-OFF
Figure 1 RECORD MODE
PRESS FOR
HOLD
1 SECOND
PRESS FOR
AVERAGE
1 SECOND
ON/OFF
RECORD MODE
RECORD MODE RECORD MODE
ON/OFF
Recommended Hole
HOLD
Placement for Supply
HOLD
HOLD
Plenum Measurements
AVERAGE
AVERAGE
AVERAGE
RECORD MODE
RECORD MODE
HOLD
HOLD
AVERAGE
UNITS
UNITS
DUCT
DUCT
Recommended
CLEAR DATA
Hole Placement for
CLEAR DATA
Return Plenum
CLEAR DATA
CLEAR DATA
Measurement is
directly before the
evaporator coil. Look behind
MAX/MIN
MAX/MIN
MAX/MIN
the panel before drilling and make
MAX/MIN
sure you do NOT drill a hole through any critical HVAC compo-
nents.
ENTER
ENTER
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Controls

Hold 1 second to toggle power on/off.
ON/OFF
Toggle Backlight. (Hold while powering
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your SRH3 on to disable APO.)
Toggle display to show relative
humidiy, dew point and wet
RH/DP/WB
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.
Confirm Selection
ENTER
Outputs calculations for Target
Superheat or Target Evaporator Exit
OUTPUT
Temperature
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Toggle to enter Target Superheat,
PRESS FOR
Target Evaporator Exit Temp, or
TSH/TEET/NORM
1 SECOND
Normal modes. 80
ON/OFF
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PRESS FOR
PRESS FOR
PRESS FOR 1 SECOND
1 SECOND
1 SECOND

Specifications

ON/OFF
Telescoping Probe Length: Up to 38 inches (97cm)
ON/OFF ON/OFF
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 Coefficient: 0.1 x (specified 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
UNITS
Auto Power off: after 15 minutes of inactivity if APO
is active.
Battery life: 150 hours typical (alkaline)
DUCT
Low Battery Indication: is displayed when the
UNITS
UNITS
UNITS battery voltage drops below the operating level.
Dimensions: 7.9 in (H) x 2.6 in (W) x 1.4 in (D),
DUCT
[200mm (H) x 66mm (W) x 36mm (D)]
DUCT
DUCT
Weight: Approx. 400g, including battery
Temperature:
ENTER
Sensor type: Precision thermistor
ENTER Operating environment: -4°F to 140°F (-20°C to 60°C)
ENTER
ENTER
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
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Functions

Backlight
1. Press the backlight button to toggle the backlight
on/off at any time during the SRH3's use.
Note: The back light will automatically shut off 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
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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
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display the battery life in percentage.
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Output
1. Press the OUTPUT button to perform calculations
of Target Superheat and Target Evaporator Exit
Temperature after necessary measurements have
been entered.
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Relative Humidity:
Sensor Type: Capacitance polymer film
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
Use the RCONE1 for
hands-free in-duct
measuremesnts.
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