1 Overview
The Televac® MX Series provides a modern replacement for legacy MP Series active vacuum gauges. This application note explains the differences in analog outputs, wiring, calibration, display, and set points that should be considered when replacing an MP2AR or MP4AR with an MX2A or MX4A.
Back to Table of Contents2 MP and MX Series Comparison
The table below summarizes the primary differences between the MX2A, MX4A, MP2AR, and MP4AR.
| 特征 | MX2A | MX4A | MP2AR | MP4AR |
|---|---|---|---|---|
| 范围 | 1*10-4至1000托尔 | 1*10-4至1000托尔 | 1*10-3至20托尔 | 1*10-3至 1000 托 |
| 导向 |
Any Vertical |
纵向 | 任何 | 纵向 |
| 模拟输出 | 7个用户可选择 | 7个用户可选择 | 2套工厂设备 | 3个厂区 |
| 沟通 | RS-485 | RS-485 | 无 | 无 |
| 响应时间 | < 2 seconds | < 1 second | < 2 seconds | < 1 second |
3 Analog Output Compatibility
MP Series gauges provide fewer analog output options than MX Series gauges. The available output modes are summarized below.
| Series | Available Analog Outputs |
|---|---|
| MP Series | Log, Linear, Non-linear |
| MX Series | Log, Linear 1, Linear 2, Linear 3, Linear 4, Linear by decade, Non-linear |
MP2AR and MX2A Analog Output Comparison
| MP2AR输出 | MX2A等效输出 |
|---|---|
| 直线型 | 线性4 |
| 非线性 | No direct equivalent |
MP4AR and MX4A Analog Output Comparison
| MP4AR输出 | MX4A等效输出 |
|---|---|
| 日志 | 日志 |
| 直线型 | 线性4 |
| 非线性 | 非线性 |
On MP Series gauges, analog output behavior is selected using jumpers and connector pin selection. On MX Series gauges, the analog output can be configured from the front panel or through RS-485 communications.
To configure an MX gauge to match the linear output of an MP gauge, select Linear 4 using the following steps:
- Navigate to the Measurement Screen.
- Press SEL four times. The screen will read Analog Out.
- Press ENT to unlock the screen.
- Press DOWN three times. The screen will read Linear 4.
- Press ENT to save the change.
4 Wiring and Pin Connections
The MP and MX Series use different connectors and pin assignments. Existing MP wiring must therefore be updated when installing an MX replacement.
Connector Comparison
| MP连接器 | MX连接器 |
|---|---|
| 9-pin D-sub | 15-pin D-sub |
Pin Mapping
| 连接 | MP引脚 | MX Pin |
|---|---|---|
| 功率(+) | 引脚3 | 引脚8 |
| 功率(-) | 引脚4 | 引脚15 |
| 对数/线性模拟输出(+) | 引脚5 | 引脚9 |
| 非线性模拟输出(+) | 引脚7 | 引脚9 |
| 模拟量输出(-) | 引脚8 | 引脚1 |
| 设定点继电器NO | 引脚1 | 引脚4 |
| 设定点继电器NC | 引脚2 | 引脚3 |
| 设定点继电器C | 引脚6 | 引脚11 |
Overall Pin Diagram Comparison
5 Calibration
Calibration points on MP Series gauges are adjusted using potentiometers (pots). MX Series calibration is performed through the front panel or RS-485 communications.
MP2AR和MX2A校准点
| 校准点 | MP2AR | MX2A |
|---|---|---|
| 零 | 是的，是的 | 是的，是的 |
| 10托尔 | 没有 | 是的，是的 |
| 760托尔（大气） | 没有 | 是的，是的 |
MP4AR和MX4A校准点
| 校准点 | MP4AR | MX4A |
|---|---|---|
| 零 | 是的，是的 | 是的，是的 |
| 1托尔 | 没有 | 是的，是的 |
| 760托尔（大气） | 是的，是的 | 是的，是的 |
The additional calibration points available on MX Series gauges allow calibration to be performed at more points across the measurement range.
Back to Table of Contents6 Display
MX Series gauges use a higher-resolution front-facing OLED display, while MP Series gauges use a top-mounted 3-character LED display.
| 说明 | MP显示 | MX显示器 |
|---|---|---|
| 种类 | 3-character 7-segment LED | 256 × 64 color OLED |
| 场地 | 顶端 | 前面 |
| 可读距离 | 3米（10英尺） | 3米（10英尺） |
The MX display also provides access to configuration settings directly from the front panel.
Back to Table of Contents7 Set Points
MX Series gauges provide two set points and support higher switching loads than MP Series gauges.
| 说明 | MP | MX |
|---|---|---|
| 设置点 | 1 | 2 |
| 种类 | 中继 | 继电器，开路集电极 |
| 继电器触点等级 | 0.5 A @ 24 V DC | 2 A @ 220 V DC (250 V AC) |
| 开放式收藏家评级 | 无 | 2 A @ 60 V DC |
8 RS-485 Communications
MX Series gauges include RS-485 communications, while MP Series gauges do not. RS-485 allows multiple addressable gauges to share the same communications bus and enables remote configuration without accessing the gauge's front panel.
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