Fieldpiece SDP2 User Manual

Fieldpiece

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Displa

y

!

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Dual In-Duct
Psychrometer

OPERATOR'S
MANUAL

Model SDP2

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-time return and supply.)

3. Press the PARAM button to cycle

between dry bulb, relative humidity,
wet bulb, dew point, and enthalpy.

4. Insert sensing probes into duct or

plenum for in-duct measurements.

80

80

5. Hold SYNC to pair and send all

measurements to Fieldpiece model
HG3 or SMAN4 Analyzers.

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 dierence between
the actual and target. Enthalpy (BTU/
LBM) and Dew Point can also be dis­played.

Certifications

C-Tick (N22675)

The TEET takes into consideration
the latent heat used to condense
water from the air, while a simple 20°

CE

temperature split ignores latent heat.
TEET, developed by Fieldpiece, is an

WEEE

intuitive test allowing you to aim for
a target value rather than a target

FCC

RoHS Compliant

01 03 0602 0504

dierence between two values.

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, 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.

Display

Auto Power O 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
Δ Display (Return-Supply)
Top Display Shows Return
Bottom Display Shows Supply

or the dierence between actual and target

values for TEET and ΔT.

Controls

Hold 1 second to toggle power on/o.
Press to toggle backlight.

Cycle through dry bulb, wet bulb, dew

PAR A M

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, Dierence (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-O (APO).

Press to cycle between Target

Evaporator Exit Temp,

TE E T/ΔT

Target Delta T and Normal

modes.

Press both to toggle between

PAR AM

for 3 min when any button is pressed. A quick press of

SYNC

Fahrenheit or Celsius and BTU/

+

LBM or KJ/KG.

BACKLIGHT NOTE: The timer is automatically reset

toggles backlight.

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 nd the
TEET. Insert the Supply probe to moni-

07 09 1208 1110

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 airow 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 Temp­Split) 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

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 Δ 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 nd 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 Δ 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.

Figure 1

Recommended hole
placem ent for SUPPLY
measurement.

Look be hind the
panel be fore drilling
and make su re you
do NOT dril l a hole
throug h any critical
components.

Recommended hole
placem ent for RETURN
measurement.

Figure 2

Use the RCONE1 for

hands-free in-duct

measuremesnts.

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 wire-

less transmitter to sync ODDB and view real-time

target superheat while you charge outside.

INPUT FORM
SET 01
Set ID:Indoor Temp
Measurement: 72.8
SET 02
SET ID:Comp Amps
Measurement: 23.6

CustomerID: __JONES123

Input

Evaporator

Exit Temp

Data
Logger

Service

Light

Clear

Target

Sync

CFM

SETUP

SubcoolingCombustion

Recall

HVAC Guide

Fieldpiece HG3

Enter

CheckMe!

Display

Superheat

Save

Output

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 ll.

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.

Specifications

80

STA2

UNITS

CLEAR DATA

RECORD MODE

PRESS FOR

1 SECOND

In-Duct
Hot Wire
Anemometer

DUCT

ON/OFF

ENTER

HOLD

AVERAGE

MAX/MIN

AUTO-OFF

APO MAXMIN HOLD SET

CO

2

EA

MAX

°F %

%

°C

ENTER

AUTO-OFF

°F

°C

TEMP CAL

PRESS FOR

1 SECOND

SOX3

Combustion
Check

Excess Air,
%CO

2

and %O

2

Natural

Gas

Oil#2PropaneCustom

EXHAUST

CLEAR

SET CUSTOM

ON/OFF

FUEL

MAX/MIN

MEASURE/HOLD

SC54

AUTO OFFTRUE RMS

CAT III

600V

TEMP

K-TYPE

30V

MAX

O

F
F

SEL

HOLD

HOLD

MAX
MIN

MAX
MIN

SYNC

MAX
MIN

Ω

VDC

VAC

µADC

HZ

MFD

400m

400

Auto

4000m

1000

400

°C

°F

NCV

MAX
MIN

TRUE RMS

BACKLIGHT

NON-CONTACT VOLTAGE

HS36

AC

80

AAT3

In-Duct
Psychrometer
& Air Velocity
Head

ON

LO BATTAVG

ENGLISH

ENGLISH METRIC

RH%

Ft/min

°F

RH%

M/s

°C

METRIC

DRY BULB
WET BULB

DEW POINT

AVG

NORMAL

AUTO OFF

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 coecient: 0.1 x (specied 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 30 minutes of inactivity if APO

is active.
Battery life: Approx. 120 hours standard use (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. 570g, 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 hysteresis: ±1%RH typical (Excursion of 10% to

90% to 10%RH)

Wireless:

Frequency range: 910MHz ~ 920MHz
FCC ID: VEARF915
Range: 100 feet
Minimum Wireless Range: 1 foot (30cm)

Error Codes

You may see an error code in TEET
or Target Delta T mode. Usually it
means probes are swapped or a bad
sensor (model RSDP2).

Err 01: Return wet bulb is higher than dry bulb.
Err 02: Return wet bulb is extremely low.
Err 03: Supply dry bulb is higher than return dry bulb.
Err 04: Return values are outside calculating range.
Err 05: Supply values are outside calculating range.
Err 06: Both the return and supply values are outside

Sensor Care

When not in use, protect the sen-

sors with the black vinyl slip covers.

Extreme conditions or exposure to
solvent vapors may oset the relative
humidity sensor. If this happens, place
the exposed sensor in a controlled
environment of 75%RH and between
68°F - 86°F for a period of 24 hours.

To create a 75%RH environment
moisten a small amount of table salt,
in an open container such as a clean
2 liter bottle cap.

Place the container with the salt
solution and the SDP2 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
permanently damage the sensor.

calculating range.

(Err 04, 05, 06 supersedes Err 01, 02, 03)

13 15 1814 1716

A/C Basics

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 responding
to the indoor heat load.

After the restrictor, refrigerant enters
the evaporator at a low temperature
and pressure, and boils (evaporates)
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.

The highly superheated gas enters
the condenser and rejects heat into
the outside air. The refrigerant con­denses back into a liquid. Once 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

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L

P

r

e

s

s

u

r

e

r

FLOW

e

S

i

d

e

e

d

i

S

THROTTLE

VALVE

REFRIGERANT

H

i

g

h

P

r

e

s

s

u

OUTDOOR AIR HOT AIR

CONDENSER

COMPRESSOR

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 verication 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,

For Service

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
repaired or replaced, at the option of
Fieldpiece, and returned via least cost
transportation. Outside of the USA,
please visit www.fieldpiece.com for
service contact information.

More Great
Products from
Fieldpiece

including but not limited to implied
warranties of merchantability and
fitness 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.

tions or exclusions may not apply to
you.

19 21 2420 2322

State laws vary. The above limita-

www.fieldpiece.com

© Fieldpiece Instruments, Inc 2013; v12

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