A Barksdale Inc. Company
Instruments & Controls for Rotating Equipment in Demanding Applications


- 监视器和扫描仪
- 数字转速表
- 有源磁传感器
- 无源可变磁阻



Since 2007




Dynalco SST-7400 Digital Speed Switch
Dynalco SST-7400 数字速度开关

Dynalco SST-7400是一款PC可编程的、安装在导轨上的速度开关,配有4个标准继电器,通过提供可靠的欠速/超速保护来保护旋转设备不受故障的影响。SST-7400 is a PC-programmable, DIN rail mounted speed switch with 4 standard relays to protect your rotating equipment from failure by providing reliable under/over speed protection.

Dynalco SST-7400 Digital Speed Switch
SST-7200 / 7200D / 7400 / 7400D Data Sheet
SST-7200/7400 Manual

Product Code: SST-7400

Dynalco SST-7400 Digital Speed Switch数字速度开关



SST-7200, SST-7400 SST-7200D & SST-7400D Product Data Sheet

Instrumentation & Controls Speed Switch / Transmitter

- Accepts 2 or 3-wire speed sensors
- 0 - 50 KHz input frequency range
- 4 – 20 mA output (isolated)
- 0 – 5 / 0 – 10 VDC linear output
- 50 msec relay response time
- 2 or 4 SPDT relays
- Failed (open) pickup sensing
- Square wave repeater output
- 10 – 36 VDC input supply power
- Available input isolation transformer
- PC programmable over USB port
- Front Keypad programmable (for models with LCD Display)
- –I suffix:
Isolated RPM input from the power supply
ground by more than 300V peak
- –AC suffix (for models with LCD Display):
AC supply voltage to use for the VAC L / VAC N terminals (see Electrical specifications)


SST-7200D和SST-7400D接受脉冲输入,并提供4-20mA输出,该输出非常精确和稳定,温度变化代表本地面板仪表或PLC模拟输入卡的旋转机械速度。它们还提供2个“SST-7200(D)”和4个“SST-7400(D)”快速继电器对超速/低速条件的响应。应用范围包括工业发动机、涡轮机械和泵的速度测量和超速保护。SST-7200(D) & SST-7400(D) accept a pulsed input and provide a 4-20 mA output that is very accurate and stable with temperature changes representing speed of rotating machinery for a local panel meter or PLC analog input card. They also provide 2 “SST-7200(D)” and 4 “SST-7400(D)” quick relay responses to over/under speed conditions. Applications include speed measurement & overspeed protection of industrial engines, turbomachinery and pumps.



Supply Voltage: 10 – 36 VDC, maximum 5 Watts (standard)
–AC suffix: Only for models with LCD Display.
AC (and DC) supply voltage on terminals VAC L & VAC N.
115 to 280 VAC & 115 to 400 VDC, with maximum 10 Watts.
Input Types: 2-wire magnetic pickup (variable reluctance)
3-wire Hall-Effect
3-wire amplified VR type
–I suffix: Isolated RPM input from the power supply ground by more than 300V peak
Input Sensitivity: 25 mV min – 50 VRMS max
Proportional Output: Fully isolated 4 – 20 mA (sourced)
Plus 0 – 5 VDC or 0 – 10 VDC
0-1 mA linear output for instrument display
Relays: SPDT contacts rated 6 Amps at 28 VDC or 115 VAC

Display Information:

RPM, Alarms, Settings (RPM signal, setpoints / relay logic, analog input,security, relay test, setpoint log, and display)

DIN rail mount (standard 35 mm)

Operating temperature range
-40°C to +70°C
Storage temperature range
-40°C to +80°C


Specify part number as follows:

2 setpoints
SST-7200 with LED
SST-7200D with Display
SST-7200-I with LED, Isolated RPM input
SST-7200D-I with Display, Isolated RPM input
SST-7200D-AC with Display, VAC supply power
SST-7200D-I-AC with Display, VAC supply power & Isolated RPM input

4 setpoints
SST-7400 with LED
SST-7400D with Display
SST-7400-I with LED, Isolated RPM input
SST-7400D-I with Display, Isolated RPM input
SST-7400D-AC with Display, VAC supply power
SST-7400D-I-AC with Display, VAC supply power & Isolated RPM input

Authorized Distributor: CNMEC Technology (Beijing) Co., Ltd Add: Rm2115, C Building T1 Tower,Wangjing SOHO,Chaoyang Dist, Beijing
Phone:010-8428 395,139 1096 2635 Email: sales@cnmec.biz Web: http://www.cnmec.biz/dynalco.htm




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