Mid-West Instrument
Tel: (586) 254-6500 · Fax: (586) 254-6509
6500 Dobry Dr., Sterling Heights, Michigan 48314
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Differential Pressure Bourdon Tube Type Gauge & Switch - Model 109
Model 109
Model 109
Literature Links

Product Bulletin Bul109.pdf
Electrical Description BulLLC.pdf

Installation/Operation

IM109.pdf
IMLLC.pdf
Instrument Installation
Recommendations

Install.pdf
 Typical Manifold Installation
The Mid-West Advantage:
  • 5 Year Warranty
  • 30 + Years Hazardous Location product manufacturer.
  • OEM capability
  • Fast on-time Deliveries
  • Friendly Customer Support
  • 3rd Party Certified Quality System
Switch Configuration - Model 109
Common Applications:
  • Pressurized Tank Level Monitoring
  • Stationary- Horizontal or Vertical
  • Tanker Transport
  • Flow Indication
  • Filter Monitoring for Gases
  • Pump Performance Testing
  • Hydraulic Filter Monitoring
  • Heat Exchange Pressure Drop Monitoring
Switch Option Features:
  • 1-2 Independently adjustable switches with Set Point Feedback
  • SPDT or DPDT Output options
  • Adjustable Deadband option for single SPDT or DPDT output (2 set pointers)
  • Accuracy of Gauge unaffected by the switch

Switch Specifications:

Electrical Configuration Matrix (Model 109)

OPTION
INTERFACE
MARKINGS
ENVIRONMENTAL
COMMENTS
A,B
1/2" Conduit, Flying Leads, 18 Awg, Color Coded
None
NEMA 4X
Requires Input Power to operate.
C,D
1/2" Conduit, Flying Leads, 18 Awg, Color Coded
None:  Designed for Class I, Div 1, Groups B,C, D; Class II, Div 1, Groups E,F, & G.
NEMA 7, NEMA 4X (OPTIONAL)
Explosion-proof enclosure. Needs Input Power to Operate.

SWITCH SPECIFICATIONS:

Parameter
Value
Comments
Input PowerOptions:

8 -28 VDC
120 VAC
240 VAC
115VDC
1 Range must be selected. (Not universal for all ranges listed)
Reverse Polarity:
8-28 VDC
AC units not applicable
Power Loss:
< 0.5 seconds
For loss of input power for time specified, unit will return to state at time of power loss.
Logic Reset:
>1 second
Logic State will be reset for loss of input power as specified.
Input current (maximum):
400 ma (DC) 100 ma (AC)
Steady State Values
Set Pointers:
1- 2 SPDT or DPDT
Set Point Adjust:
5% - 95% FSR
Output Contact Rating:
10 Amps @ 30 VDC, 120 / 240 VAC
Temperature:
-40º F to + 160º F
(-40ºC to + 71ºC)
Electrical Interface:

1/2” Conduit (standard) 3/4” (2 DPDT)
24” Color Coded Flying Leads