eyc-tech PHM330 Differential Pressure Transmitter Instruction Manual
- June 12, 2024
- eyc-tech
Table of Contents
Operation Manual
eyc-tech PHM330
Differential Pressure Transmitter
PHM330 Differential Pressure Transmitter
Differential Pressure
Differential Pressure Transmitter
Security considerations
Please read this Specification carefully, prior to use of this, and keep the
manual properly, for timely reference.
Solemn Statement：
This product can not be used for any explosion-proof area.
Do not use this product in a situation where human life may be affected.
eyc-tech will not bear any responsibility for the results produced by the
operators！
Warning!
- Installation and wiring must be performed by qualified personnel in accordance with all applicable safety standards.
- This product must be operated under the operating conditions specified in manual to prevent equipment damages.
- Please using the product under the ordinary pressure, or it will influence safe problem.
- This product must be operated under the operating condition specified in this manual to prevent equipment damages.
- This product must be operated under the normally atmospheric condition to prevent equipment damages.
- To prevent products damage, always disconnect the power supply from the product before performing any wiring and installation.
- All wiring must comply with local codes of indoor wiring and electrical installation rules.
- Please use crimp type terminal.
- To prevent personal injury, do not touch the moving part of product in operation.
- It may cause high humidity atmosphere during the product was breakdown. Please take safety strategy.
Dimension
Connection Diagram
DIP Switch
( Function)
1. Activate / deactivate DIP switch
3∼4. Switch measuring range-1
5. Switch measuring range-2
6. Linear/ Square root, output switching
7. Filtering On / Off
Switch 1: Activate / deactivate DIP switch
The function of DIP switch_3 … 7 is only effective while DIP switch_1 is
toggled to “On”. Switch 3 & 4: Switch measuring range-1
User can switch measuring range by toggling switch_3&4 according to the table
below.
Please note that when switch_3&4 are both toggled to “On”, the measuring range
is set as factory default or the range set in user software by user. (unit:
Pa)
DIP switch 3| DIP switch 4| Range (10)| Range (20)|
Range (30)
---|---|---|---|---
| | 50| 300| 1000
| | 100| 500| 1500
If user switch measuring range by DIP switch, the accuracy is for reference
only.
Switch 5: Switch measuring range-2
User can toggle switch_5 to choose unidirectional or bidirectional of
measuring.
Ex: When the maximum measuring value is 300 Pa
Switch_5 “On”: unidirectional, 0…300 Pa
Switch_5 “Off”: bidirectional, -300…300 Pa
| STATUS | 0…100% | -100…100% |
|---|---|---|
| DIP switch 5 |
Switch 6: Linear / Square root, output switching
Square root output is for air velocity application. With proper instrument,
air velocity can be calculated from the square root of differential pressure.
| STATUS | √ | LINEAR |
|---|---|---|
| DIP switch 6 |
The following formulas are used to convert linear signal to a square root
extraction type:
For 4…20 mA output:
OutputSqRt = 4mA + (4 x √ (OutputLinear – 4mA))
For 0 … 10 V output:
OutputSqRt = √ 10 x √ OutputLinear
Switch 7: Filtering On/Off
User can toggle switch_7 to turn on / off signal filtering function. When
turned on, filtering function will follow setting in user software.
| STATUS | On | Off |
|---|---|---|
| DIP switch 7 |
Analog Output setting
User can choose 4 … 20 mA or 0 … 10 V for analog output by placing jumper to
the corresponding places shown in the table below. 
* User must do a power cycle after changing jumper
placement.
Autozero
This button allows user to set the current pressure to zero point. It is
required to press the button about 5 seconds, and user can see LED2 will turn
on. Then user can release this button and will see the LED2 flashing, and the
new zero point has been set.
This button also allows user to restore factory default setting. It is
required to press the button about 10 seconds, user will first see LED2 turn
on then off. Then user can release this button and will see the LED2 flashing,
and the new zero point has been set.
RS-485 and Modbus
PHM330 integrate a RS-485 interface for digital communication as a option
feature.
Based on Modbus protocol makes the general convenience on PLC, HMI and PC
connection. For Modbus protocol information please attached the file from
website to download. Besides the PLC, HMI application, the user software
provide the device setting and data logging function, it also can free
download from website
Technical Data
- Max. network size: 32 transmitters
- Communication: with COM-Port (serial interface) of PC
- Max. network expansion: 1200m (3937ft) total length at 9600 baud
- Transmission rate: 9600, 19200, 38400, 57600, 115200 Baud
- Parity: None, Even, Odd
- Data length: 8 bit
- Stop bit: 1 or 2 bit
- Factory default Station address = 1, Data format= 9600, N81
User Software
-
Hardware connection: Connect the PHM330 to PC by USB to RS-485 converter.
-
Check the COM port number from Computer Management
-
Open the PHM330 UI, go to function “Interface”, click item “Config” and then setting COM port, BAUD rate and data format, pressed “Scan” bottom for scan devices and “Apply” for connection.
-
Setting on Analog Output
i. Quantity: Pressure
ii. Filter (sec): 0, 5, 10, 20, 25 seconds
iii. Signal: Linear / Square root extraction
– LCD shown the √ mark on left-low side and red green of LED2 flash slowly while the square root extracted function has active.
iv. Upper Range, Lower Range: Range for Span of Upper and Lower
-
Setting on RS-485 and offset adjustment
i. Station ID: 1~247
ii. Baud Rate: 9600 / 19200 / 38400 / 57600 / 115200
iii. Data Frame: None-8Bit-1Stop / None-8Bit-2Stop / Even-8Bit-1Stop / Even- 8Bit-2Stop / Odd-8Bit-1Stop / Odd-8Bit-2Stop /
iv. Pressure Offset adjustment, unit available in Pa only
v. Multiple: The multiple factor of measuring value, from 0.01 to 100
vi. Temperature (℃): gas temperature
vii. Relative Humidity (%): gas humidity
viii. Air Pressure (mBar): gas pressure
ix. K Coefficient: Pitot tube flow coefficient
x. Area (m2): pipe cross-sectional area
xi. Unit of Velocity Rate
xii. Unit of Volume Rate if Area mode or display label if Span mode
xiii. Calculation method of volumetric rate: Selecting Span means the volume flow rate is calculated according to the upper and lower points of the volume range, and selecting Area means the volume flow rate is calculated by multiplying the converted flow velocity by the flow coefficient and the pipe cross-sectional area.
xiv. Upper Range, Lower Range: Volume Span of Upper and Lower
-
Unit setting, data display and data logging
i. Pressure unit: mbar, Pa, hPa, kPa, mmH2O, mmWS, inH2O, mmHg, mmAq
ii. Export file: *.CSV
-
Transmitter information
www.eyc-tech.com
eyc-tech Measuring Specialist
enhance your capability with sensor technology
Air flow | Humidity | Dew point | Differential pressure | Liquid flow
Temp. | Pressure | Level | Air quality | Signal meter
Tel.：886-2-8221-2958
Web：www.eyc-tech.com
e-mail：info@eyc-tech.com