Series 685 Differential Pressure Transmitter

Push-Button Zeroing, Adjustable Pressure Range and Response Time

The Series 685 Differential Pressure Transmitter is used to measure differential pressure and vacuum. The adjustable pressure range and output signal make it the ideal choice for installers and maintenance professionals. It has a user-configurable response time via a jumper and can be mounted in any orientation. Applications include building automation systems, clean room monitoring, valve and flap control, filter monitoring, and air flow control. It has an adjustable pressure range, a single button to zero, and can be reset to factory settings with a long button press. No additional reference pressure sources or separate calibration devices are necessary.

Product Applications

  • Building automation, air-conditioning and clean room technology
  • Valve and shutter control
  • Filter, ventilator and fan monitoring
  • Air-flow control

Models & Ordering

Filter By

Shipping Information

All shipping times are dependent on product availability at time of shipment.

Although we make every effort to ensure a continuous supply of our products, occasional circumstances may force us to temporarily run out of a product, or have shipping delays. Should this occur, customers will be notified soon after placement of any orders for such products and, if applicable, items will be put on backorder. For orders requiring expedited shipment, our customer service team can be contacted to confirm product availability

Model Description Usually Ships* Price Order
685-00
Ships: Same Day
Price: $115.00
Differential pressure transmitter, 0-1" wc, 4-20mA output Same Day* $115.00 Order
685-01
Ships: Same Day
Price: $99.50
Differential pressure transmitter, 0-2" wc, 4-20mA output Same Day* $99.50 Order
685-02
Ships: Same Day
Price: $115.00
Differential pressure transmitter, 0-3" wc, 4-20mA output Same Day* $115.00 Order
685-03
Ships: Same Day
Price: $99.50
Differential pressure transmitter, 0-5" wc, 4-20mA output Same Day* $99.50 Order
685-04
Ships: Same Day
Price: $115.00
Differential pressure transmitter, 0-10" wc, 4-20mA output Same Day* $115.00 Order
685-05
Ships: Same Day
Price: $99.50
Differential pressure transmitter, 0-15" wc, 4-20mA output Same Day* $99.50 Order
685-06
Ships: Same Day
Price: $115.00
Differential pressure transmitter, 0-20" wc, 4-20mA output Same Day* $115.00 Order
685-07
Ships: 3-4 Weeks
Price: $99.50
Differential pressure transmitter, 0-25" wc, 4-20mA output 3-4 Weeks* $99.50 Order
685-08
Ships: Same Day
Price: $115.00
Differential pressure transmitter, 0-40" wc, 4-20mA output Same Day* $115.00 Order
685-09
Ships: Same Day
Price: $99.50
Differential pressure transmitter, 250 Pa, 4-20mA output Same Day* $99.50 Order
685-10
Ships: Same Day
Price: $115.00
Differential pressure transmitter, 750 Pa, 4-20mA output Same Day* $115.00 Order
685-11
Ships: Same Day
Price: $99.50
Differential pressure transmitter, 1250 Pa, 4-20mA output Same Day* $99.50 Order
685-12
Ships: Same Day
Price: $115.00
Differential pressure transmitter, 2500 Pa, 4-20mA output Same Day* $115.00 Order
685-13
Ships: Same Day
Price: $99.50
Differential pressure transmitter, 5000 Pa, 4-20mA output Same Day* $99.50 Order

Specifications

Service:
Air and non-corrosive gases.
Sensor Type:
Piezoresistive pressure sensor.
Output Signal:
2-wire: 4-20 mA; 3-wire: 0-10 V.
Supply Voltage:
2-wire: 18-30 VDC; 3-wire: 18-30 VAC/DC.
Loop Resistance:
2-wire: 500 Ω max; 3-wire: ≥ 1 kΩ (≤ 10 mA).
Maximum Current Draw:
2-wire: 21 mA; 3-wire: 40 mA.
Accuracy*:
≤ ±0.5% RSS (BFSL), ± 1Pa.
Thermal Effects*:
See model-dependent specifications table.
Long-Term Stability*:
≤ ±1% RSS per year.
Temperature Limits:
-4 to 158°F (-20 to 70°C).
Humidity Limits:
0 to 95% RH, non-condensing.
Response Time:
1 s (default) or 200 ms (user selectable).
Pressure Connections:
6 mm hose connection.
Electrical Connection:
Spring connector for cable and leads up to 1.5 mm².
Cable Conduit:
Cap nut conduit, 15 mm (across flats), made of polyamide.
Mounting:
Screw fastening with sheet metal screws.
Housing Material:
ABS.
Housing Dimensions:
Ø 66 x 28 mm.
Enclosure Rating:
IP54.
Weight:
1.6 oz (46 g).
Compliance:
CE, UKCA.

*Accuracy specifications are based on measurements at 73°F (23°C).

Features

  • Cost effective and compact device suitable for OEM applications where space, simplicity, and value are key
  • Single button to zero saves maintenance time
  • Factory restore to defaults with a long button press
  • User-adjustable response time provides versatility for many applications

Accessories

Model Number Description Usually Ships* Price Order
4 A-489 4" 303 SS straight static pressure tip with flange, 1/4" hose barb. Same Day $9.00 Order
100 to 240 VAC/VDC to 24 VDC power supply. SCD-PS 100 to 240 VAC/VDC to 24 VDC power supply. Same Day $36.50 Order
Aluminum DIN rail A-360 Aluminum DIN rail 16-17 Weeks $11.00 Order
303 SS Static pressure tip with mounting flange, for 3/16 A-302F-A 303 SS Static pressure tip with mounting flange, for 3/16" I.D. rubber or plastic tubing. 4" insertion depth, includes mounting screws Same Day $11.75 Order
Plastic static pressure tip. A-480 Plastic static pressure tip. Same Day $2.00 Order
A-685-DIN DIN rail adapter kit for Series 685 Same Day $12.50 Order

Product Literature

Manuals

Catalog Pages

Product Data Sheet

Approvals

Drawings

Product Reviews

Only registered users can write reviews. Please Sign in or create an account