WILKERSON INSTRUMENT CO., INC.

SR2700 Frequency Input Field Rangeable
Two-Wire Transmitter

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SR2700

SR2700
Frequency Input
Field Rangeable
Two-Wire Transmitter

$220.00

This product is available to OEM manufacturers and for Private Labeling.

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The following information must be entered to complete your order:
See "Specifications" below for Input range limits.

Input: Turn Down
  Full Scale Frequency Range

Quantity:

 

     Additional Range Cards

 

Don't Forget Your Accessories
DMP2000 DIN-Rail Mounting Plate $15.00
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Specifications
TSH-A6L NEMA-4 Aluminum Connection Head (SR, SF, TW3) $60.00
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Specifications
XJAY Explosion Proof Housing $140.00
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DR1 DIN-Rail, 35mm Symmetrical, 39 inches (1 meter) $20.00
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Specifications
 
  • Features
  • Description
  • Specifications
  • Dimensions
  • Connections
  • 4/20mA Output Proportional to Frequency Input
  • Range is Established by Plug-In Range Card
  • 10 Cards Provide Continuous Cover From 12.5Hz to 12800Hz Full Scale
  • 20 : 1 Dynamic Range Below Full Scale - Useable to 0.6Hz
  • 10 : 1 Range Cards Available For Faster Response - Useable to 1.25Hz
  • Special Range Card Filters Available
  • Test Points - Monitor Current Without Breaking Loop - .08" Probes
  • Reverse Polarity Protected (when meter is connected to test points)
  • Surge Protector On Power Input

The SR2700 is a flexible frequency input two-wire transmitter for Head or DIN rail mounting. It provides a 4 to 20 mA output proportional to the frequency of the input signal.

The input circuit is capacitor coupled so an AC signal imposed on a DC voltage can be measured. Sine or square wave AC signals may also be measured.

A pull-up resistor is provided so the input can be derived from a switch, contact closure, or an open collector NPN transistor such as an optical isolator.

A plug-in range card determines the operating frequency of the unit. 10 cards are available which cover the range from 12.5Hz to 12800Hz full scale. Each card covers a 2 to 1 range (i.e. 12800 to 6400 Hz). Full scale can be any frequency in the range of the card.

Filtering of the Frequency to DC converter signal allows a 20 to 1 dynamic range below the Range Card’s lowest Full Scale frequency. (RC-20)

Range cards are also available with a 10 to 1 dynamic range below the Range Card’s lowest Full Scale frequency. These Range cards provide a faster response time. (RC-10)

Optional special filters can be provided with a custom dynamic range below a selected Full Scale frequency. The filtering circuits are in the Range Card.

The Zero and Span controls are available on the top of the case.

Test points on the top of the case allow measuring the output current without breaking the loop.

The SR2700 is enclosed in an extruded aluminum case with an aluminum back plate. An optional clip is available for mounting the SR2700 on a DIN rail.

TYPICAL APPLICATIONS
Turbine flow meters
Paddle wheel flow meters
Rotating machinery speed
Conveyor speed.
Wind mill rotational speed
Frequency of AC from a generator

INPUT SIGNAL RANGE
AC Voltage Amplitude 
30mV rms to 50V rms AC Voltage Imposed On DC Voltage
Amplitude
DC Voltage + Peak of AC Voltage is limited to 100V

Pull-Up Resistor
10Kohm to +5V

INPUT IMPEDANCE
> 350K For Inputs < 10V P-P
150K Ohms For Inputs > 10V P-P

OUTPUT
4 TO 20mA Current Limited 22mA

LINEARITY
± 0.01% of Full Scale

ACCURACY
± 0.1% of Span

USEABLE RANGE (Range Card Dependent)
Full Scale - Any Range of Range Card Dynamic Range
FS / 20 or FS / 10
* See Note 1

RIPPLE & RESPONSE TIME
See Chart Below

MAX LOAD RESISTANCE
RLoad = (PS - 10V) / .02 Ohms

OPERATING TEMPERATURE
-25C to 70C -13F to 158F

TEMPERATURE STABILITY
±0.004% / Deg C

POWER
10 to 36VDC Polarity Protected **

Note 1
The useable range is a level where ripple on the output reaches a level of 5mV P-P. The range can be greater and is only limited by the amount of ripple which can be tolerated.

The filter is a 3 pole RC filter built into the Range Card.

Optional special filters are easy to implement and can be provided.

** Reverse polarity not protected when meter is connected to test points.

 

STANDARD
RANGE CARDS

LOWEST USABLE
FREQUENCY
@ 5mV P-P Ripple

TIME TO REACH 95% OF
NEW VALUE FOR A STEP
CHANGE IN FREQUENCY

Full Scale
Frequency Ranges

Dynamic Range
20 / 1                    10 / 1

Dynamic Range
20 / 1                         10 / 1

       12.5Hz to 25Hz
          25Hz to 50Hz
          50Hz to 100Hz
        100Hz to  200Hz
        200Hz to  400Hz
        400Hz to  800Hz
        800Hz to  1600Hz
      1600Hz to  3200Hz
      3200Hz to  6400Hz
      6400Hz to  12800Hz

0.6Hz                    1.25Hz
1.25Hz                     2.5Hz
2.5Hz                      5Hz
5Hz                      10Hz
10Hz                     20Hz
20Hz                     40Hz
40Hz                     80Hz
80Hz                     160Hz
160Hz                   320Hz
320Hz                   640Hz

20S                            6S
5S                             3S
2.6S                           1.5S
1.3S                         640mS
640mS                       320mS
320mS                       160mS
160mS                       80mS
80mS                         40mS
40mS                         20mS
20mS                         10mS

SR2000 Series Dimension Drawing

SR2000 Series Connections Drawing

Specifications    Manual

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