Fieldpiece
Dual In-Duct
Psychrometer
OPERATOR'S
MANUAL
Model SDP2
80
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How to Use
Normal Mode
Measure real-time dry bulb, relative humidity, wet bulb, dew point, or BTU/LBM for each probe.
1.Remove vinyl protective sleeves if covering sensors.
2.Press the PARAM button to cycle dry bulb temperature, relative humidity, wet bulb, dew point, or BTU/LBM.
3.The top display shows Return probe and the bottom display shows Supply probe. The probes are interchangeable.
TEET (Target Evaporator Exit Temperature) Mode
Target Evaporator Exit Temperature, is similar to temperature drop or ΔT. TEET is better than a simple temp-split because it uses a wet and dry bulb temperature on the evaporator coil to determine the coil load and then calculates a corresponding correct exit dry bulb temperature.
Insert the Return probe to find the TEET. Insert the Supply probe to moni-
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Quick Start
1.Power on your SDP2 by holding the 
button for 1 second.
2.Select mode with the TEET/ΔT button: Target Evaporator Exit Temperature, Target Temp Split, or Normal(real-timereturnandsupply.)
3.Press the PARAM button to cycle betweendrybulb, relativehumidity, wet bulb, dew point, and enthalpy.
4.Insert sensing probes into duct or plenum for in-duct measurements.
5.Hold SYNC to pair and send all measurementstoFieldpiecemodel HG3 or SMAN4 Analyzers.
Certifications
C-Tick (N22675)
CE
WEEE
FCC
RoHS Compliant
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tor how close the target temperature is to the actual temperature.
1.Insert the RETURN probe into the return plenum. See Figure 1 for recommended return plenum placement of probe. Drill or punch a 3/8" hole into the return plenum if needed.
2.Press the TEET/ΔT button until TEET is displayed on the top line.
3.Insert the SUPPLY probe into the supply plenum to see how close the target temperature is to the actual temperature. See Figure 1 for recommended
supply plenum placement of probe. Drill or punch a 3/8" hole into the supply plenum if needed.
4.(Actual evaporator temp - target evaporator temp) will be shown on the bottom "SUPPLY" line. A negative number means the actual exit temperature and airflow are both too low. You want to be within ± 3°F (± 1.7°C) of the target for good evaporator performance.
5.Seal any holes before leaving the jobsite.
Target ΔT (Target Temp-
Split) Mode
Temperature split is simple. It is the return temperature minus the supply temperature. Target ΔT uses RETURN wet bulb and dry bulb to measure heat load and automatically calculate
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Description
The two probes each simultaneously measure temperature and RH%. One goes before the evaporator (RETURN) and one goes after the evaporator (SUPPLY). These four measurements can be displayed or used in calculations to display the actual temperature split (delta T), the target temperature split, the actual exit evaporator temperature, or the target exit evaporator temperature (TEET), plus the difference between the actual and target. Enthalpy (BTU/ LBM) and Dew Point can also be displayed.
The TEET takes into consideration the latent heat used to condense water from the air, while a simple 20° temperature split ignores latent heat. TEET, developed by Fieldpiece, is an intuitive test allowing you to aim for a target value rather than a target difference between two values.
The 38"(96cm) telescoping probe with laser etched ruling and flattened
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what the ΔT should be.
Insert the RETURN probe to find the Target ΔT. Switch over to Normal mode, and use both probes to then see what your dry bulb actually is.
1.Insert the RETURN probe into the return plenum. See Figure 1 for recommended return plenum placement of probe. Drill or punch ! a 3/8" hole into the return plenum if needed.
2.Press the TEET/ΔT button until TARGET ΔT is displayed on the top line.
3.Switch to Normal Mode to find the actual ΔT so you can compare the two values.
4.Insert the SUPPLY probe into the supply plenum. See Figure 1 for recommended supply plenum placement of probe. Drill or punch ! a 3/8" hole into the supply plenum if needed.
5.Press PARAM until DB is shown. Press H/Δ/M/M
until is shown.
6. Seal any holes before leaving the jobsite.
RCONE1 Probe Lock
Figure 2. Screw a threaded RCONE1 into the duct or plenum wall to secure a sensing probe. Use the RCONE1s and the magnet on the SDP2 for hands-free in-duct testing.
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edges allows you to locate proper measurement points within a duct and ensures that your probe is properly aligned. The dual display, bright backlight, and rugged rubber boot with probe clips make sure the SDP2 is ready for any job.
! WARNING
Do not retract the sensor probe by pulling on the
cord. Doing so may sever the cord from the sensors. Do not punch or drill holes into an evaporator
without making sure there is not critical system parts behind the hole location.
Maintenance
Clean the exterior with a dry cloth. Do not use liquid.
Battery Replacement
Turn your SDP2 off, remove rubber boot, unscrew battery cover, and replace 9V battery.
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Figure 1
Recommended hole placement for SUPPLY measurement.
Look behind the
! panel before drilling and make sure you do NOT drill a hole through any critical components.
Recommended hole placement for RETURN measurement.
! |
! |
Figure 2
Use the RCONE1 for
hands-free in-duct
10 measuremesnts.
Display
Auto Power Off Enabled
Battery Life
Wireless Signal Strength
Relative Humidity
Dew Point
Wet Bulb
Dry Bulb
Enthalpy
Target Evaporator Exit
Temperature
Target Dry Bulb Temp Split
Temperature
Maximum Display
Minimum Display
Hold Display
Display (Return-Supply)
Top Display Shows Return
Bottom Display Shows Supply or the difference between actual and target values for TEET and ΔT.
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Wireless Sync
The SDP2 can wirelessly send all of its measurements to a wireless Fieldpiece model that accepts them. As of this printing, models HG3 and SMAN4 both can receive measurements.
4-Port Wireless Manifold
Model SMAN4
1.Enter Target Superheat mode.
2.Use arrow keys to select IDWB. (IDWB will blink)
3.Press SYNC on SMAN4 for 1 second.
4.Press SYNC on SDP2 for 1 second to connect and sync real-time indoor wet bulb.
5.Use a temperature accessory head and ET2W wireless transmitter to sync ODDB and view real-time target superheat while you charge outside.
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Controls
Hold 1 second to toggle power on/off.
Press to toggle backlight.
Cycle through dry bulb, wet bulb, dew PARAM point, relative humidity, and Enthalpy.
Hold for 1 second to search for a model HG3 or SMAN4 and send real-time
SYNC measurements.
Cycles through Hold, Difference (Δ), Maximum, Minimum, and Real-time.
H/Δ/M/M Hold for 1 second to exit and clear stored values. Hold while turning ON to toggle Auto-Off (APO).
Press to cycle between Target Evaporator Exit Temp,
TEET/ΔT Target Delta T and Normal modes.
Press both to toggle between PARAM + SYNC Fahrenheit or Celsius and BTU/
LBM or KJ/KG.
BACKLIGHT NOTE: The timer is automatically reset for 3 min when any button is pressed. A quick press of 
toggles backlight.
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INPUT FORM
SET 01
Set ID:Indoor Temp
Measurement: 72.8
SET 02
SET ID:Comp Amps
Measurement: 23.6
CustomerID:__JONES123
Input |
Sync |
Output |
|
|
Enter |
CFM 
SETUP
Target
Evaporator CheckMe!
Exit Temp
Data |
Logge |
Service
Light
Combustion Subcooling
r |
|
|
Clea |
Recall |
Save |
|
|
HVAC Guide
Fieldpiece HG3
HVAC Guide® System Analyzer
Model HG3
1.Select test.
2.Use arrow keys to select a measurement line.
3.Press SYNC on HG3 for 1 second.
4.Press SYNC on SDP2 for 1 second to connect and sync ALL lines of the test that it can fill.
5.Values will be held if OUTPUT is pressed. Going back to INPUT will show the held values. Press SYNC on the HG3 to return to real-time values.
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