The Dwyer HFT-3210 is an in-line flow transmitter that measures water flow from 1 to 10 GPM through a 1/2 in. female NPT 304 stainless steel body. It shows flow rate on an integral direct-reading scale and transmits a proportional 4-20 mA or 0-5 VDC signal from a 12-35 VDC supply, or a 1-5 VDC signal from a 17-35 VDC supply.
The signal goes to a PLC, process control computer, recorder or panel-mount display, so the HFT-3210 serves as the primary input device for recording flow rate. Output type is selected in the field with a programmable jumper and wired through a 4-pin DIN connector. The unit mounts horizontally, vertically or inverted with no inlet or outlet straight-pipe requirement.
Specifications per Dwyer Series HFT catalog page 278 and Bulletin F-HFT, FR# 443343-00 Rev. 4 (9/19). Verified October 13, 2026.
Best For
- Waste water processing
- Process control
- Solar systems
- Drain lines
- Pump testing
- Driving data acquisition devices, meters or analog input cards
Warranty
For warranty coverage on the Dwyer HFT-3210, contact Team Zot at 855-825-2811 or sales@zotsupply.com.
Key Features
Three Analog Output Options
4-20 mA (two-wire) or 0-5 VDC output, selected with a programmable jumper. 1-5 VDC is taken across a 249 Ω resistor on the 4-20 mA loop with a 17-35 VDC supply.
Local Flow Indication
An integral direct-reading scale shows 1 to 10 GPM at the meter, while the electronics transmit the same flow rate to the control system.
Horizontal, Vertical or Inverted Mounting
Installs horizontally, vertically or inverted with no inlet or outlet straight plumbing requirement.
NEMA 4X Enclosure
Capable of outdoor or harsh-environment installation, with a 4-pin DIN connector for the signal wiring.
304 SS Body, 6000 psig
304 SS body rated to 6000 psig (413 bar) and 170°F (76°C), with Buna-N or fluoroelastomer seals, a PTFE coated Alnico magnet and 304 SS internal parts.
Factory-Calibrated Output
Response time under 100 ms, ±2% FS accuracy and ±1% FS repeatability. Outputs are factory calibrated.
ZOT Supply is an authorized distributor of Dwyer products.
Technical Specifications
| Model | HFT-3210 |
|---|---|
| Series | Dwyer Series HFT In-Line Flow Transmitter |
| Service | Compatible gases or liquids |
| Flow Range (Water) | 1 to 10 GPM |
| Process Connection | 1/2 in. female NPT |
| Body Material | 304 SS |
| Seals | Buna-N or fluoroelastomer |
| Magnet | PTFE coated Alnico |
| Other Internal Parts | 304 SS |
| Pressure Limit | 6000 psig (413 bar) |
| Temperature Limit | 170°F (76°C) |
| Viscosity Limit | 500 SSU |
| Accuracy | ±2% FS |
| Repeatability | ±1% FS |
| Response Time | <100 ms |
| Output Signal | 4-20 mA (two-wire); 0-5 VDC; 1-5 VDC (via 249 Ω resistor on the 4-20 mA loop) |
| Power Requirements | 12-35 VDC (17-35 VDC for 1-5 VDC output) |
| Max Loop Resistance (4-20 mA) | Rmax = 50 x (Vs - 12) Ω, where Vs is the supply voltage in VDC |
| Receiver Input Impedance (0-5 VDC) | 100 Ω minimum |
| Recommended Fuse | 0.25 A on the 4-20 mA circuit |
| Electrical Connection | 4-pin DIN connector |
| Enclosure Rating | NEMA 4X |
| Mounting | Horizontal, vertical or inverted; no inlet or outlet straight-run requirement |
| Filtration Requirement | 200 mesh (74 micron) |
| Shipping Weight | 3 lb (1.4 kg) |
Documentation
Frequently Asked Questions
What output signals does the Dwyer HFT-3210 provide?
The HFT-3210 provides a two-wire 4-20 mA signal or a 0-5 VDC signal, selected with a programmable jumper on the signal conditioning board. A 1-5 VDC signal is obtained by configuring the 4-20 mA output and placing a 249 Ω resistor in parallel with the receiver.
What is the flow range of the Dwyer HFT-3210?
The HFT-3210 reads 1 to 10 GPM of water and has a 1/2 in. female NPT process connection.
What power supply does the HFT-3210 require?
The HFT-3210 runs on 12-35 VDC. The 1-5 VDC configuration requires 17-35 VDC. A 0.25 A fuse is recommended on the 4-20 mA circuit even though the signal conditioning circuit has integral over-current protection.
What are the pressure and temperature limits of the HFT-3210?
The 304 stainless steel body is rated to 6000 psig (413 bar), with a temperature limit of 170°F (76°C).
Does the HFT-3210 need straight pipe before or after it?
No. The HFT-3210 has no inlet or outlet straight plumbing requirement and can be mounted horizontally, vertically or inverted.
How much loop resistance can the HFT-3210 drive on 4-20 mA?
Maximum loop resistance is Rmax = 50 x (Vs - 12) Ω, where Vs is the supply voltage in VDC, with a supply between 12 and 35 VDC.
Does the HFT-3210 require filtration?
Yes. Observe the 200 mesh (74 micron) filtration requirement of the flow sensor to keep the internals from jamming.
- Series:
- HFT
- Product Type:
- In-Line Flow Transmitter
- Media:
- Water
- Flow Range:
- 1-10 GPM
- Connection Type:
- Female NPT
- Connection Size:
- 1/2 in.
- Body Material:
- 304 Stainless Steel
- Output Signal:
- 4-20 mA, 0-5 V, 1-5 V
- Supply Voltage:
- 12-35 VDC
- Max Pressure:
- 6000 psig
- Enclosure Rating:
- NEMA 4X
