Greystone Energy Systems PS-2ADP Series Manual

Hardware Installation Guide
PS-2ADP Series
Low Air Differential Pressure Transmitters, Nema 4X
Figure 1a: PS-2ADP Series (-P models)
Figure 2b: PS-2ADP Series (-X models)
Product Description
The PS-2ADP Series transmitters can be used to measure positive, negative or differential pressure in ranges from 1 “WC to 40 “WC
(250 to 2000Pa). The piezoresistive sensor is ideal for monitoring the pressure of air or other clean inert gases and is limited only
to those media which will not attack polyetherimide, silicon, fluorosilicone, silicone, EPDM, and neoprene seals.
The PS-2ADP Series features field-selectable pressure ranges and output signal types for the most flexible applications. Typical
HVAC applications include monitoring of filter differential pressure or VAV applications. The output signal is factory calibrated and
temperature compensated for highest startup accuracy and trouble-free operation.
General Installation Requirements
For proper installation and subsequent operation of each device, pay special attention to the following recommendations:
- Upon unpacking the product, inspect the contents of the carton for shipping damages. Do not install damaged device.
- Avoid areas where corroding, deteriorating or explosive vapors, fumes or gases may be present.
- Ensure that all equipment is installed according to local, regional, and national regulations.
Personal injury or loss of life may occur if you do not follow a procedure as specified.
Equipment damage or loss of data may occur if you do not follow a procedure as specified.
Do not use in an explosive or hazardous environment, with combustible or flammable gasses, as safety or emergency
stop devices or in any other application where failure of the product could result in personal injury
Take reasonable precautions to prevent electrostatic discharges to the controller when installing, servicing or operating
the controller. Discharge accumulated static electricity by touching one’s hand to a well-grounded object before working
with the controller.

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Mounting Instructions
The transducer mounts on a vertical surface using the two integrated mounting holes. Ensure there is enough space around the unit
to connect the pressure tubing without kinking and to make the electrical connections, avoid locations with severe vibrations or
excessive moisture. The two mounting holes will facilitate a #10 size screw (not supplied). Ensure there is enough space around the
unit to make the electrical connections and that it is within an acceptable distance for the length of remote sensor cable. Drill a hole
in the duct and insert so the probe point is facing into the air flow. The enclosure has a standard opening for a 1/2” conduit and may
be installed with either conduit and a conduit coupler or a cable gland type fitting. See Figure 2.
The two mounting holes will facilitate a #10 size screw (not supplied). See Figure 2. Ensure there is enough space around the unit to
make the electrical connections and that it is within an acceptable distance for the length of remote sensor cable.
Figure 2a: Mounting (-P models)
Figure 2b: Mounting (-X models)
The enclosure has a hinged cover with a latch. Open the cover by pulling slightly on the latch on the right side of the enclosure and at
the same time pulling on the cover, as illustrated in Figure 3.
Figure 3a: Opening (-P models)
Figure 3b: Opening (-X models)
A 1/2" NPT threaded connection hole is provided on the bottom side of the enclosure. Screw the EMT connector or cable gland
connector in until tight. See Figure 4. It is recommended that weatherproof conduit or cable gland fittings be used. The European
models include 1/2" NPT to M16 thread adapter and cable gland fitting. See Figure 4.
Figure 4a: Connecting (-P models)
Figure 4b: Connecting (-X models)
Swing door closed until securely latched. Two security screws are provided which can be installed to help secure the cover once
settings and wiring connections are complete. See Figure 5.

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Figure 5a: Closing (-P models)
Figure 5b: Closing (-X models)
Wiring
The transmitter has standard screw block connectors and easy wire access to facilitate wiring. It is recommended that shielded twisted
pair wiring at least 22 AWG be used for all connections and that the device wires not be run in the same conduit with wiring used to
supply inductive loads such as motors. Disconnect the power supply before making any connections to prevent electrical shock or
equipment damage. Make all connections in accordance with national and local electrical codes.
The device power (24 VAC/DC) is connected to the terminal marked PWR. This terminal is used for the positive dc voltage or the hot
side of the ac voltage. The device is reverse voltage protected and as such will not operate if connected backwards.
For voltage output signal types (3-wire) or for AC power supply operation (3-wire), the common of the power supply is connected to
the terminal marked COM. Note that this device has a half-wave type power supply which means the power supply common is the
same as the output signal common. Therefore, several devices may be connected to one power supply and the output signals all
share the same signal common. Use caution when grounding the secondary of an ac transformer or when wiring multiple devices to
ensure that the circuit ground point is the same on all devices and the controller. This terminal is not used for loop-powered 4-20 mA
output type (2-wire).
The analog output signal is available on the OUT terminal. This signal is switch selectable for either a voltage output or a standard
loop-powered 4-20 mA output signal type. When voltage mode is selected, either 0-5 VDC or 0-10 VDC can also be selected. These
options are clearly indicated on the device circuit board. The analog output signal is typically connected directly to the Building
Automation System. (B.A.S.) and used as a control parameter or for logging purposes.
For voltage type output signal the device has a minimum load that it is able to drive, similarly for current type output signal the device
has a maximum load that it is able to drive with a particular power supply voltage. Observe and follow these ratings in the Specification
section or inaccurate reading may result. The 4-20 mA output signal can easily be converted to a 1-5 VDC signal for controllers
accepting this type of input. Simply insert a 250-ohm (0.1% is best) resistor between the “+” and “-” inputs of the controller. This will
convert the 4-20 mA signal to the desired 1-5 VDC.
Figure 6a: Wiring (-P models)

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Figure 6b: Wiring (-X models)
Configuration
The transmitter is configured with switches located on the circuit board as shown on the PCB drawing. These switches are used to
select the output signal type and the input pressure range. The unit is factory configured to operate in the 4-20 mA output mode. This
can be changed to the voltage mode by moving the switch from the position marked 4-20 mA to the position marked Voltage. Once
the output mode is changed to voltage, the output scale may be changed to either 0-5 VDC or 0-10 VDC. This is done by moving the
switch to the 5V or 10V position marked 5/10 on the five position DIP switch. The pressure range is set with a five position DIP switch.
Switch Setting
PS-2ADP04
PS-2ADP08
PS-2ADP12
PS-2ADP20
PS-2ADP01K
PS-2ADP02K
LOW
1 “WC
3 “WC
6 “WC
10 “WC
0.25" kPa
0.5 kPa
MID
2 “WC
5 “WC
10 “WC
15 “WC
0.5 kPa
1 kPa
HIGH
4 “WC
8 “WC
12 “WC
20 “WC
1 kPa
2 kPa
For example, if the LOW range is selected on the PS-2ADP04 model, the pressure range will be 0-1 “WC. If the 4th DIP switch labeled
(+/) is also set to ON, then the pressure range will be –1 to +1 “WC. This means that each model has six pressure ranges. For the
PS-2ADP20, they will be 0-1, 0-2, 0-4, ± 1, ± 2 and ± 4 “WC.

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Pneumatic Connections
The two pressure ports on the end of the enclosure are labeled High and Low. The output signal reads a positive value when the port
pressure is higher on the High port than the Low port so ensure these ports are connected correctly. Use 0.170” I.D. flexible tubing
for the pressure connections. Arrange the tubing to minimize stress on the connections and ensure there are no kinks in the tubing.
For most accurate measurements, do not leave the Low port open to the atmosphere, run a return line from the Low port to the vicinity
of the point being measured.
Ensure the tubing to be used is clean and do not allow material to fall into the pressure ports as contamination could damage the
sensor. When removing tubing use care to avoid breaking the ports. In some cases, it is better to cut the tubing off rather than pulling
it off but be careful not to cut the fitting or an air leak may occur.
Power-Up Instruction
Before turning on the power, verify all wiring to ensure that it complies with one of the included wiring diagrams and verify that the
output signal type is correctly selected with the switches. Also, review the specifications to ensure the power supply is correct and
that the pressure is within the correct range.
At this time, also inspect the internal pressure tubing that connects the sensor to the external ports to ensure that the tubing did not
get kinked during shipping or installation.
Proper operation can be verified by measuring the output signal. For voltage output configuration, measure the voltage between the
OUT and COM terminals. The voltmeter should read between 0-5 VDC or 0-10 VDC depending on the output range selected. For
current output configuration, insert a mA meter in series with the OUT terminal. The mA meter should read between 4 and 20 mA.
Operation
If the unit is set to a unipolar range such as 0-2 “WC, then the pressure applied to the High port must be higher than the pressure
applied to the Low port. In this case, if the Low port is left open to ambient pressure and the High port is used to measure a positive
pressure, then the output pressure can be calculated as follows:
4-20 mA
Pressure = [(Output current - 4 mA) / 16 mA] x Range
0-5 VDC
Pressure = (Output voltage / 5 V) x Range
0-10 VDC
Pressure = (Output voltage / 10 V) x Range
In the case of 0-2 “WC, 4 mA or 0 V = 0 “WC and 20 mA or 5 V or 10 V = 2 “WC. Since the transmitter is linear, 1 “WC would be 12
mA or 2.5 V or 5 V. If the positive pressure connection is reversed, then the transmitter will always output 4 mA or 0 V.
If the unit is set to a bipolar range such as ±2 “WC, then the pressure applied to the High port should be higher than the pressure
applied to the Low port for a positive output response. In this case, differential pressure can be measured using both ports. If the High
port has a positive pressure with respect to the Low port, then the output indicates a positive pressure. Negative pressure is indicated
if the High pressure is less than the Low pressure. For bipolar ranges, the output pressure can be calculated as follows:
4-20 mA
Pressure = [(Output current - 4 mA) / 16 mA] x 2 x Range - Offset
0-5 VDC
Pressure = (Output voltage / 5 V) x 2 x Range - Offset
0-10 VDC
Pressure = (Output voltage / 10 V) x 2 x Range - Offset
Calibration
All pressure ranges are factory calibrated and no calibration is necessary. The user may adjust the zero point if desired when changing
ranges for example. Make sure the unit is warmed up for at least 10 minutes (1 hour is best) before making a zero adjustment. With
both ports open to the ambient pressure, press and hold the ZERO button for at least 3 seconds. Release the button after at least 3
seconds and the device will calculate and store the new zero point.
Generally, it is not recommended that the span calibration be performed in the field unless a high-quality calibrator with low differential
pressure ranges is available and the temperature of the sensor can be maintained. Contact the factory for information on this type of
calibration.

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Specifications
Pressure Ranges
1) ±4", ±2", ±1", 0-4", 0-2", 0-1 “WC
2) ±8", ±5", 0-8", 0-5", 0-3 “WC
3) ±12", ±10", ±6", 0-12", 0-10", 0-6 “WC
4) ±20", ±15", ±10", 0-20", 0-15", 0-10 “WC
5) ±1000 Pa, ±500 Pa, ±250 Pa, 0-1000 Pa, 0-5000 Pa, 0-250 Pa
6) ±2000 Pa, ±1000 Pa, ±500 Pa, 0-2000 Pa, 0-1000 Pa, 0-500 Pa
(6 per model, switch selectable)
Accuracy
±1% F.S.O.
Measurement Type
Differential (two port), Static, Velocity, & Total Pressure
Response Time
250 ms
Stability
<±0.5% F.S.O. per year
Thermal Effects
<±3% over compensated range
Compensated Range
0 to 50°C (32 to 122°F)
Proof Pressure
40 "WC (100" for 10", 20" & 40” models)
Burst Pressure
60 "WC (200" for 10”, 20" & 40” models)
Operating Conditions
0 to 50°C (32 to 122°F), 10 to 90% RH, non-condensing
Power Supply
20-28 VAC/DC (non-isolated half-wave rectified)
Supply Current
<4 mA for voltage output, 20 mA max for current output
Input Voltage Effect
Negligible over specified operating range
Protection Circuitry
Reverse-voltage-protected and output limited
Output Signal
4-20 mA (2-wire), 0-5 or 0-10 VDC (3-wire), field selectable
Output Drive
Capabilities
Current: 400 ohms max @ 24 VDC Voltage: 10K ohms min
Zero Adjustments
Push-button auto-zero
Wiring Connections
Screw terminal block (14 to 22 AWG)
Pressure Connection
Barbed ports for 5 mm (0.170" ID) exible tubing
Conduit Connection
1/2" NPT conduit or cable gland
Optional Display
31/2" digit LCD, 0.4" digit height
Enclosure
Polycarbonate UL94-V0, IP65 (NEMA 4X)
European models include a thread adapter (1/2" NPT to M16) and cable gland fitting
Approvals
CE, RoHS
Country of Origin
Canada

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Dimensions
Figure 7a: Dimensions (-P models)

©, Distech Controls Inc. 2023 All rights reserved.
While all efforts have been made to verify the accuracy of information in this manual, Distech Controls is not responsible for damages or claims arising
from the use of this manual. Persons using this manual are assumed to be trained HVAC specialist / installers and are responsible for using the correct
wiring procedures and maintaining safe working conditions with fail-safe environments. Distech Controls reserves the right to change, delete or add to
the information in this manual at any time without notice.
Distech Controls, the Distech Controls logo, and Innovative Solutions for Greener Buildings are trademarks of Distech Controls Inc. All other
trademarks are property of their respective owners.
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Figure 7b: Dimensions (-X models)