SAFETY INSTRUCTIONS
1. Depressurize and vent system prior to installation or removal.
2. Confi rm chemical compatibility before use.
3. Do not exceed maximum temperature/pressure specifi cations.
4. Wear safety goggles or faceshield during installation/service.
5. Do not alter product construction
6. If this equipment is used in a manner not specifi ed by the manufacturer, the protection provided
by the equipment may be impaired.
7. This device is not approved for use or installation in hazardous locations.
Signet 2537 Paddlewheel Flowmeter
3-2537.090
3-2537.090 Rev C 06/09 English
English
Specifi cations
General
Wetted Materials
Model Suffi x Sensor Body Rotor Pin O-ring
-P0, -P1 glass-fi lled PP PVDF, Black Titanium FPM
-T0 PVDF, Natural PVDF, Natural PVDF, Natural FPM
Case: PBT, yellow
Inside cover: Valox, black
Wiring ports ½ in. NPT threads; liquid-tight
connector accepts cables 7-10 mm od
(0.275-0.394 in.)
Power requirements
Pulse, Flow Switch
With dry-contact relay: 24 VDC nominal
(21.6 VDC min. to 26.4 VDC max.)
30 mA max current
With solid-state relay: 5 to 24 VDC nominal
(5.0 VDC min to 26.4 VDC max.)
30 mA max current
Digital (S
3
L): 5 VDC nominal
(5.0 VDC min to 6.5 VDC max.)
30 mA max current (1.5 mA nominal)
4-20 mA: 12 VDC to 32 VDC nominal
(10.8 VDC min to 35.2 VDC max.)
400 mV max ripple voltage
30 mA max current
Reverse Polarity and short circuit protected: Up to 40V, 1 hour
Over-voltage protection: +60 VDC, -50 VDC
Paddlewheel sensor performance specifi cations
Pipe Size Range: DN15 to DN 200 (½ in. to 8 in.)
Min. Reynolds Number: 4500
Paddlewheel Frequency: 49 Hz per m/s nominal
(15 Hz per ft/s nominal)
Operating Range: 0.1 m/s to 6 m/s (0.3 ft/s to 20 ft/s)
Linearity: ±1% of max. range @ 25°C (77°F)
Repeatability ±0.5% of max. range @ 25°C (77°F)
Electronics performance specifi cations
Input Frequency Range: 1 Hz to 1000 Hz
System Response: 100 ms update rate nominal
Environmental Requirements
Enclosure rating: NEMA 4X/IP65
Storage Temperature: -10°C to 75°C
Ambient Temperature: 0°C to 65°C
Relative Humidity: 0 to 90% RH, non-condensing
Altitude: 2000 m (6562 ft.)
Pollution Degree: 2
Output specifi cations
Signal Averaging: Programmable 0 to 100 seconds
Sensitivity Response: Programmable 0 to 9 scale
Pulse divider/Total pulse output
Pulse Divider Setting: 1.0000 to 99999
Maximum pulse rate: 300 Hz
Maximum pulse width: 50 ms
Flow switch output
Relay Modes: Low, High
Time Delay: 0.0 to 6400.0 seconds
Hysteresis: Adjustable in Engineering Units
Relay Specifi cations
Mechanical SPDT: 5A @ 30 VDC, 5A @ 250VAC
Solid-State Relay: 100mA @ 40VDC, 70 mA @ 33 VAC
Digital (S
3
L) output
Type: Serial ASCII, TTL level 9600 bps
Maximum cable length: See S
3
L specifi cations
Current output (Passive 4 to 20 mA)
Loop Accuracy: ±32 μA (@ 25°C @ 24 VDC)
Loop resolution: 5 μA
Temp. drift: ±1 μA per °C max.
Power supply rejection: ±1 uA per V
Maximum cable: 300 m (1000 ft.)
Max Loop Resistance: 600Ω @ 24 VDC, 1KΩ @ 32 VDC
Standards & Approvals
• UL
• CE
• ISO 9001 and ISO 14001
Description
The 2537 Paddlewheel Flowmeter Series offer low fl ow, low power and high resolution with various output options such as a fl ow
switch, pulse divider, Digital (S
3
L), or 4-20 mA. This unit can be confi gured on-site directly through the built-in user interface.
• The Digital model provides a digital (S
3
L) output for use with the Signet 8900 Multi-Parameter Controller.
• The 4-20 mA model provides a blind current loop output.
• The Flow Switch Model uses a single relay (mechanical or solid state) for Hi or Lo alarm operation.
• The Pulse model uses a single relay (mechanical or solid state) and has two selectable operating modes:
• The Divider mode scales the paddlewheel frequency down to accommodate low frequency input devices.
• In Total mode, the Pulse Model becomes a traditional pump pulser, able to output one pulse per a set volume of fl uid.
A small LCD enables the 2537 to be programmed without any external equipment. During normal operation the display is not visible.
China RoHS (Go to www.gfsignet.com for details)
