GEMS 16MA1A0 Liquid Level Control – 120VAC, SPDT, 8-Pin Octal Socket
🧭 Product Overview
The GEMS 16MA1A0 Level Control is a reliable liquid level control designed for industrial and commercial applications.
It operates in direct acting mode with 4,700 ohms sensitivity, providing precise level sensing and control.
The unit features a SPDT relay (1 Normally Open / 1 Normally Closed), operates on 120VAC, and is housed in a general-purpose plug-in module with an 8-pin octal socket, making installation and maintenance simple.
Designed for durability, this control supports up to 10A resistive loads or 1/3 HP motors and operates reliably in temperatures ranging from -40°F to 150°F.
✅ Key Features
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✅ Direct acting mode for precise liquid level control
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✅ SPDT relay: 1 Normally Open, 1 Normally Closed (non-powered)
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✅ Supply voltage: 120VAC, 50/60Hz, 4.4 VA
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✅ Load capacity: 10A resistive, 1/3 HP
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✅ 8-pin octal plug-in module with screw connectors for easy installation and service
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✅ Sensitivity: 4,700 ohms (up to 1 million ohm/cm)
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✅ Control style: General purpose, plug-in module
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✅ Temperature range: -40°F to 150°F
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✅ Protection: Non-intrinsically safe
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✅ Wire type: Copper (60/75°C / 140/167°F) only
📊 Technical Specifications
| Specification | Detail |
|---|
| Brand |
GEMS |
| Model / Part Number |
16MA1A0 |
| Mode of Operation |
Direct Acting |
| Supply Voltage |
120VAC, 50/60Hz, 4.4 VA |
| Secondary Voltage |
12 VAC |
| Relay Type |
SPDT (1 NO / 1 NC) |
| Contact Rating |
10A Resistive, 1/3 HP |
| Terminal Style |
Screw Connector, 8-pin octal socket |
| Sensitivity |
4,700 ohms |
| Min / Max Temperature |
-40°F / 150°F |
| Protection |
Non-intrinsically safe |
| Control Style |
Plug-in module, general purpose |
| Wire Type |
Copper (60/75°C / 140/167°F) only |
⚠️ Symptoms / When to Replace
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⚠️ Relay fails to switch at proper liquid levels
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⚠️ Inaccurate liquid level sensing or false triggering
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⚠️ Visible corrosion on screw terminals or octal socket
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⚠️ Unit does not power on or load does not engage
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⚠️ Sensitivity drift or malfunction over time
❓ Frequently Asked Questions (FAQ)
Q: What type of relay does this unit have?
A: SPDT with 1 Normally Open and 1 Normally Closed contact (non-powered).
Q: What is the supply voltage?
A: 120VAC, 50/60Hz, 4.4 VA.
Q: What loads can it handle?
A: 10A resistive or 1/3 HP motors at 120/240VAC.
Q: How is it installed?
A: 8-pin octal plug-in module with screw-type connectors for easy service.
Q: What is the operating temperature range?
A: -40°F to 150°F.
🛒 Shopping Tips
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✅ Confirm part number 16MA1A0 matches your application.
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✅ Ensure your system operates on 120VAC supply voltage.
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✅ Check load requirements: 10A resistive / 1/3 HP max.
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✅ Use only copper wire rated 60/75°C / 140/167°F.
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✅ Octal socket design allows quick installation or replacement.
