Dwyer 626 Series Industrial Pressure Transmitter Instruction Manual

: June 10, 2024
: Dwyer

Table of Contents

Dwyer 626 Series Industrial Pressure Transmitter
Series 626/628-CB Industrial Pressure Transmitters
Product Installation Instructions
Dimension
SPECIFICATIONS
INSTALLATION
OPERATION
MODEL CHART
MAINTENANCE/REPAIR
WARRANTY/RETURN
DWYER INSTRUMENTS, INC.
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

Dwyer 626 Series Industrial Pressure Transmitter

Dwyer-626-Series-Industrial-Pressure-Transmitter-
product

Series 626/628-CB Industrial Pressure Transmitters

The Series 626/628-CB Industrial Pressure Transmitters are designed to measure pressure in compatible gases and liquids. The wetted materials are made of Type 316L SS, ensuring durability and reliability. There are various pressure ranges available, with maximum pressure limits ranging from 10 psi to 6000 psi. Pressures exceeding the maximum pressure limit may cause damage to the transmitter.

The accuracy of the Series 626/628-CB Industrial Pressure Transmitters is 0.25% FS, 0.20% RSS for the 626 model and 1.0% FS, 0.5% RSS for the 628 model. The power requirements for the transmitter are 10-35 VDC for a 2-wire connection and 13-35 VDC or isolated 16-33 VAC for a 3-wire connection. The output signal for a 2-wire connection is 4-20 mA, while a 3-wire connection has a field-selectable output signal of 0-5, 1-5, 0-10, or 2-10 VDC. The transmitter has a push button inside the conduit enclosure for zero adjustment and has a response time of 300 msec. The loop resistance for current output is 0 to 1000 (max), Rmax = 50(Vps-10), while the minimum load resistance for voltage output is 5 k (0-5, and 1-5 VDC), 15 k (0-10 and 2-10 VDC). The maximum current consumption is 38 mA.

The electrical connections use a removable terminal block and a 1/2 female NPT conduit, while the process connections use a 1/4 female or male NPT or BSPT. The enclosure rating is designed to meet NEMA 4X (IP66) for non-LCD models. The transmitter is not position sensitive and has a weight of 10 oz (283 g). It is compliant with CE standards.

Product Installation Instructions

Location: Choose a location where the temperature of the unit will be between the specified operating temperature range.
Position: The transmitter is not position sensitive, but it is recommended to install it in the position calibrated at the factory for best accuracy.
Pressure Connection: Use a small amount of plumber’s tape or other suitable sealants to prevent leaks. Ensure that the pressure passage inside the port is not blocked.
Electrical Connections: The maximum length of wire connecting the transmitter and receiver should not contribute to more than 10% of the receiver resistance to total loop resistance. For wiring length under 100 feet (30.5 m), wire as small as 22 AWG can be used.

The transmitter has a button to toggle the unit between PSI and BAR on the LCD display and a zero button to zero the gauge.

The Series 626 & 628 Industrial Pressure Transmitters monitors the pressure of compatible gases and liquids with 0.25% full-scale accuracy for 626 models or 1.0% full-scale accuracy for 628 models. The design employs a pressure sensor that can convert a single positive pressure into a standard 4-20 mA output or field selectable voltage output. The terminal block, as well as a zero adjustment button, are easily accessed under the top cover. The Series 626 and 628 are designed to meet NEMA 4X (IP66) construction.

Dimension

Dwyer-626-Series-Industrial-Pressure-Transmitter-fig-1

PRESSURE LIMITS

PRESSURE LIMITS

Range| Maximum Pressure| Over Pressure
0 to 5 psi| 10 psi| 50 psi
0 to 15 psi| 30 psi| 150 psi
0 to 30 psi| 60 psi| 300 psi
0 to 50 psi| 100 psi| 300 psi
0 to 100 psi| 200 psi| 500 psi
0 to 150 psi| 300 psi| 750 psi
0 to 200 psi| 400 psi| 1000 psi
0 to 300 psi| 600 psi| 1500 psi
0 to 500 psi| 1000 psi| 2500 psi
0 to 600 psi| 1200 psi| 3000 psi
0 to 1000 psi| 2000 psi| 5000 psi
0 to 1500 psi| 3000 psi| 5000 psi
0 to 3000 psi| 6000 psi| 7500 psi
Pressures exceeding the maximum pressure limit may cause a calibration shift of up to ±3% of full scale.

SPECIFICATIONS

Service: Compatible gases and liquids.
Wetted Materials: Type 316L SS.
Accuracy: 626: 0.25% FS, 0.20% RSS; 628: 1.0% FS, 0.5% RSS; 626 absolute ranges: 0.5% FS, 0.35% RSS (includes linearity, hysteresis, and repeatability).
Temperature Limits: 0 to 200°F (-18 to 93°C).
Compensated Temperature Limits: 0 to 175°F (-18 to 79°C).
Pressure Limits: See chart.
Thermal Effect: 626: ±0.02% FS/°F; 628: ±0.04% FS/°F (includes zero and span).
Power Requirements: 2-wire: 10-35 VDC; 3-wire: 13-35 VDC or isolated 16-33 VAC (reverse polarity protected).
Output Signal: 2-wire: 4-20 mA; 3-wire: Field selectable 0-5, 1-5, 0-10, or 2-10 VDC.
Zero Adjustment: Push button inside conduit enclosure.
Response Time: 300 msec.
Loop Resistance: Current output: 0 to 1000 Ω (max), Rmax = 50(Vps-10); Voltage output: Minimum load resistance = 5 kΩ (0-5, and 1-5 VDC), 15 kΩ (0-10 and 2-10 VDC).
Current Consumption: 38 mA (max).
Electrical Connections: Removable terminal block; 1/2˝ female NPT conduit.
Process Connections: 1/4˝ female or male NPT or BSPT.
Enclosure Rating: Designed to meet NEMA 4X (IP66) for non-LCD models.
Mounting Orientation: Not position sensitive.
Weight: 10 oz (283 g).
Compliance: CE.

INSTALLATION

Location: Select a location where the temperature of the unit will be between 0 and 175°F (-18 to 79°C). Distance from the receiver is limited only by total loop resistance. The tubing feeding pressure to the instrument can be practically any length required, but long lengths will increase response time slightly.
Position: The transmitter is not position sensitive. However, all standard models are originally calibrated with the unit in a position with the pressure connection downward. Although they can be used at other angles, for best accuracy, it is recommended that units be installed in the position calibrated at the factory.
Pressure Connection: Use a small amount of plumber’s tape or other suitable sealants to prevent leaks. Be sure the pressure passage inside the port is not blocked.
Electrical Connections
- Wire Length – The maximum length of wire connecting the transmitter and receiver is a function of wire size and receiver resistance. Wiring should not contribute to more than 10% of the receiver resistance to total loop resistance. For extremely long runs (over 1000 ft or 305 m), choose receivers with higher resistance to minimize the size and cost of connecting leads. Where wiring length is under 100 feet (30.5 m), wire as small as 22 AWG can be used.

CURRENT (4-20 mA) OUTPUT OPERATION

An external power supply delivering 10-35 VDC with minimum current capability of 40 mA DC (per transmitter) is required to power the control loop. See Figure 1 for connection of the power supply, transmitter, and receiver. The range of appropriate receiver load resistance (RL) for the DC power supply voltage available is expressed by the formula:

RL Max = Vps – 10
- 20 mA DC

Shielded cable is recommended for control loop wiring

Dwyer-626-Series-Industrial-Pressure-Transmitter-fig-2

Electrical connections to the Series 626/628-CB pressure transmitters are made to the terminal block located inside the housing. Remove the screws and lift off the cover. Lift off the terminal block for wiring. Wire as show in Figure 1 or 2. Use Figure 1 for current output connection. Use Figure 2 for current output with optional LCD display. If ordering pre-wired cable, black wire is negative [-] and red wire is positive [+].

M-12 Pin Connector with Current Output

For the optional M-12 4 pin connector, wire to pins as shown in Figure 3.

OPERATION

VOLTAGE (0-5, 1-5, 0-10, or 2-10 V) OUTPUT OPERATION

Dwyer-626-Series-Industrial-Pressure-Transmitter-fig-5

To select the voltage output that is going to be used, configure the DIP switches according to Figure 4 below. Power must be cycled whenever dip switches are changed to select output.

Voltage output with optional LCD

M-12 4 Pin Connector with Voltage Output

For the optional M-12 4 pin connector, wire to pins as shown in Figure 7.

MODEL CHART

Example| 626| -02| -CB| -P1| -E2| -S8| -NIST| 626-02-CB-P1-E2-S8- NIST
Series| 626

628

1.0% FS accuracy

Range| | 06

07

08

09

10

11

12

13

14

22

15

16

18

19

26

0 to 15 psi

0 to 30 psi

0 to 50 psi

0 to 100 psi

0 to 150 psi

0 to 200 psi

0 to 300 psi

0 to 500 psi

0 to 600 psi

0 to 1000 psi

0 to 1500 psi

0 to 3000 psi

0 to 5000 psi

0 to 8000 psi

Housing| | | CB| | | | | Conduit box housing
Process Connection| | | | P1 P2 P3

P4

| | | | 1/4˝ male NPT 1/4˝ female NPT 1/4˝ male BSPT

1/4˝ female BSPT

E9

| | | Cable gland with 3´ prewired cable Cable gland with 6´ prewired cable Cable gland with 9´ prewired cable 1/2˝ female NPT conduit

M-12 4 pin connector (not UL)

Signal Output| | | | | | S1

S8

| | 4-20 mA

Selectable 0 to 5, 1 to 5, 0 to 10, or 2 to 10 VDC

SPCL

| Aluminum tag LCD display

NIST traceable calibration certificate

Special cleaning for oxygen use

*Pressures exceeding the working pressure limit may cause a calibration shift of up to ±3% of full scale.

MAINTENANCE/REPAIR

Upon final installation of the Series 626/628-CB Industrial Pressure Transmitter, no routine maintenance is required. The Series 626/628-CB is not field serviceable and is not possible to repair the unit. Field repair should not be attempted and may void the warranty.

WARRANTY/RETURN

Refer to “Terms and Conditions of Sale” in our catalog and on our website. Contact customer service to receive a Return Goods Authorization number before shipping the product back for repair. Be sure to include a brief description of the problem plus any additional application notes.